SYMPOSIUM OF IGCP 506 ON:

Marine and mm-mrrhm Jwmubt global c0rrmMkn and

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TUNISIA (Hammamet), March 2&31,2008 Faculty of Sdenoes of Bizerte (FSB) Mabrouk- BOUGHDlRl (FSB) Faculty of Saenoes of Tunis (FST) Mohamed SOUSSl (FST)

P Tnasurer Tunisian Association of Natural Sciences GASMI M. (FSB) (North Section, Bit&) Ormanirina Association lFSQ

Tunisian Association -EL ASMI K. (FSB) of lntematiml Studies of Geology (A.T.E.1.G) -apmm#drr, and- Technical sum . SHA J. (China) 0 TANFOUS-AMRI D. (FSB) WANG Y. (China) PIENKOWSKY G. (Poland) MORTON N. (France) OLORIZ F. (Spain) mw&awak MARQUES B. (Portugal) mlmdm CHELLAI E.H. (Morocco) AIT ADD1 A (Morocco) BOUGHDlRl M. (FSB) BACHNOU A. (Momcco) SOUSSl M. (FST) SADKI D. (Morocco) BEN ISMAIL M.H. (FST) MAROK A. (Algeria) BEDlR M. (CERTE) Z.-TURK1 D. (FST) Organking Committeq TURK1 M. M. (FST) BEN YOUSSEF M. (CERTE) BOUGHDlRl M. (FSB) BEN ISMAIL-LATTRACHE K. (FST) SOUSS1 M. (FST) 8 RABlA M.C. (FLHM) BEN ISMAIL M.H (FST) G.-RAZGALLAH S. (FST) BEDlR M. (CERTE) Sludrner turn dthe O.C, BOUAZZ S. (ENIS) GASMl M. (FSB) BMHA1 ALI M. (ONM) ELASMI K. (FSB) sAUOUHI H. (F=) MANSOUR1 A. (ONM) TANFOUS-AMRI D. (FSG) MAALAOUI K. (FSB) GASMl M. (FSB) RABHl M. (FST). HADDAD S. (FST) BEN HAMZA Ch. (FSB) BEN YWSSEF M. (CERTE) ARBAWI A (FSB) JEDWl Y. (ISEGabBs) RABlA M.C. (FLHM) RIAHI S. (FST) KAMMOUN F. (FSS) LAYEB M. (ISAMS) HAsBOUttl I. (FSB) BEN FERJANI A (ETAP) CHAOUACHI M.C. (ISf3'N) BWKHALFA K. (FST) FAKHFAKH BEN JEMIA H.(ETAP)

BOUGHDlRl M., SOUSSl M., BEN ISMAIL M.H., BEDlR M.,EL ASMl K. B TANFOUS-AMRI D.

Northern and Central Tunisia; - Southern Tuniwa. BOUGHDlRl M., SOUSSl M., HADDAD S. & RABHl M. SOUSSl M. & EL ASMl K.

FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008

TABLE OF CONTENTS

A CKNO WLEDGEMENTS ......

SYMPOSIUM PROGRAMME......

IN MEMORIAN......

HONORARY GUESTS......

ABSTRA CTS ......

INTEGRATED STRATIGRAPHY :

Be1 kahla A., Boudagher Fadhel M,, Soussi M. and Bosence D. KJ - First charactemsation of early Jurassic (Sinemurian) from shallw marine carbonates of southern tethysian margin of Tunisia......

Casellato C.E., N. Rameil & J.Schnyder - Integrated stratigraphy of Upper Kimmeridgian-Upper Beniasian interval- Clue de Taulanne section (SE France)......

Fb'zy Istvcin - Late Jurassic facies succession and Stratigraphy in Hungary......

Glowniak Ewa, Bronislaw A. Matyja & Andrzej Wienbowski - Upgraded sudivision of the Oxfordian and Kimmeridgian as a consequence of recent correlations......

Hadgi R, Marok A., Sebane A., Benyahia M., Mehiaoui R, Bounoua B. & Soulimane C. - Preliminary results on the Toarcian bio-geo-events in the Traras Mounts (Northwestern Algeria)......

Vasily V. Mitta - The Bajocian-Bathonian boundary in European Rusia......

M. Palma Ricardo, Javier Martin-Chivelet, Josi, Lbpez Gbmez, Andrea Concheyro & Marina Lescano- High-resolution cyclostratigmphy analysis from a Tithonian marl-limestone alternating succession,' Vaca Muerte Formation, Neuqukn Basin, Mendoza, Argentina......

Pietikowski Grzegorz, Grzegon Niediwiedzki, Leszek Marynowski & Marta Waksmundzka - T/J boundary in continental deposits of Poland: implication for globalcorrelations......

Rehakova D. & E. Halhovci - Calcareous microplankton and nannoplankton assemblages recorded in the West Carpathian Late Jurassic/Early ~retace&ssedimentary sequences - tools for biostratigraphy and paleoenvironrnental reconstruction......

Sallouhi H. & Boughdiri M. - Calpionellid successions through the Tithonian-Bemasian series of the Tunisian Trough......

Sallouhi H. & Boughdiri M. - Chitinoidellid faunas through the Lower-Upper Tithonian boundary: populations from the Northern Tunisia, Moroccoan Prerif and Carpathians compared......

Soulimane C., Marok A., Sebane A., Hammouda S.A. & Hadgi F. - Establishment of the biochronological canvas of the Toarcian with the Unitary Association method: Foraminifera biozones..

Tanfous Amri D.Soussi.M, B6dir.M &Azaeiz .H - Seismic sequence stratigraphy of the Jurassic of Central Atlasic Tunisia...... Valery Ja. Vuks - Stratigraphical scheme of the Upper Jurassic of Caucasus...... Wang Yongdong, Bihong Fu, Xiaoping Xie, Guodong Zheng, Gang Li, Xaoju Yang, Yanhong Pan, Qing Ni & Ning Tian - The non-marine Upper Triassic and Lower Jurassic sequences in the Sichuan Basin, SW China with special references to the TIJ boundary: apreliminary account...... FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2008

Wierzbowski Andrzej, Glowniak Ewa, Kiselev Dmitty, Rogov Michail, Wright J. K. - Correlation potential of theflodigarriensis horizon of proposed GSSP for the base of Kimmeridgian (Staffm Bay, Isle of Skye, Scotland) in the light of new data from Russian and Polish sections......

SEDIMENTOLOGY AND PALAEOENVIRONMENTS :

Abdellah AIT ADD1 & Mohamed ETTAKI - Jurassic event sedimentation in the Central High Atlas, Morocco: an overview......

Atef Be1 Kahla , Mohamed Soussi & Dan Bosence -Early Jurassic (Senumurian) shallow marine carbonate platform of Atlas Tunisia (Southern Tethyan margin) and associated peritidal cycles: sedimentary characteristics, depositional environments and controlling factors...... Bihong Fu, Yongdong Wang, Xiaoping Xie, Guodong Zhmg.- Deformed beds in the middle to Jurassic lacustrine sequences in suining region, central Sichuan basin, china: possible eviden paleoseismic events......

RoiiE Boztjan, Andrej $muc.- Jurassic sedimentary evolution of Slovenian basin; Easternmost southern alps......

Bressan Graciela S & Palma Ricardo M - Trace fossil assemblages from Lower Toarcien-Lower Bajocian siliciclastic marine platform, Neuqukn Basin (Argentina)......

L. V. Duarte, L C. V. Oliveira, F. Silva, M. J. Comas-Rengifo, R. Rodriguez & R Silva - Organic-rich facies in the Lower Jurassic series of the Lusitanian Basin (Portugal). Stratigraphic definition and Total Organic Carbon...... Milvio Fazzuoli - The mid-Jurassic marine transgression in East Aiiica: the Bihen limestone (Callovian- ? Early Oxfordian), Northern Somalia......

Sofzane Haddad, Mohamed Soussi & Mabrouk Boughdiri - Storm generated calcareous tempestites in pelagic facies (Upper Toarcian-Aalenian, Bou Garnine Hammam Lif, Northern Tunisia)......

Ricardo M. Palma & Diego A. Kietzmann - Shallow-burial diagenetic Realm of Upper Jurassic carbonate ramps: La Manga Formation, Neuqukn Basin (Argentina)......

D. S&, M. Soussi, A. Akasbi & B. Igmoullan - The Liassic and Dogger of the Maghrebian Atlases in their tethyian context ......

Jan Schlogl, Adam Tomaio@ch, Roman Aubrecht, Charles Mangold & Mari'cin Golej - Neptunian dykes as windows into time of sedimentary breaks. Examples 6om the Middle and Upper Jurassic of the Czorsztyn pelagic carbonate platform (West Carpathiam)......

Xaoping Xe, Yongdong Wang Bihong Fu, Guodong Zheng- Sedimentary facies of the upper Jurassic suining and penglaizhen formations in central Sichuan basin, SW China......

BlODlVERSlTY CHANGES AND PALAEOECOLOGY :

Ana Mhrquez-Aliaga, Susana Damborenea & Antonio Goy - A preliminary study of Hettangian Bivalves ftom the Triassic-Jurassic passage beds in northern Spain......

Roman Aubrecht, Jan Schlogl, Michai. Krobicki, Hubert Wierzbowski, Bronislaw Andnej Matyja & Andrzej Wierzbowski - Middle to Upper Jurassic stromatactis mud-mounds in the Pieniny Klippen Belt (Carpathians) - a clue to the origin of stromatactis......

Sun Bainian, Xe Sanping, Yan Defei, Li Xangchuan and Wen Wmwen - Cdicular character of Jurassic fossil plants as indicators of palaeoenvironmental change in China......

Bachnou A. Boughdiri M. & Sallouhi H. - Morphommetric shape analysis of Upper Tithonian calpionellids : examples from Northern Tunisia and Moroccoan Prerif......

Jiang Bao-Yu, Sha Jin-geng & Pan Yan-Hong - Some Early Juassic non-marine bivalves fiom the southern Junggar Basin, NW China...... FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2006

Michal KROBICKI, Driss SADKI, Jan WLONKA, Anna PLONKA, Urszula PREDKI & Anna RUSIN - Early Jurassic Lithiotis-facies deposits in northern Africa (Morocco; Assemsouk section) - case study.. ..

M.Ourribane, E.H. Chellai, M. Soussi, D. Zaghbib Turki & B. Oujhaine- The Upper Jurassic reefs in the Maghrebian Atlas (Morocco, Tunisia)......

Ricardo M. Palma, Josk, LCpez Gbmez, Ricardo D. Piethk, Diego A. Kietzmann & Susana Adamonis- Oxfordian reef architecture of the La Manga Formation, Neuqukn Basin, Mendoza Province, Argentina.

Popa, M.E. & Kedzior, A. - Vertebrate burrows in the Lower Jurassic continental Steierdorf Formation, Romania......

Sha Jingeng, Huawei Cai, Yanhong Pan, Yaqiong Wang, Xaolin Zhang and Xaogang Yao - Jurassic system of Qmghai-Xizang (Tibet) plateau, China......

Xiang-Wu Wu, Xiao-Ju Yang & Bo-Le Zhang - Sinoljeune yimaensis gen. nov. et sp. nov. (Hepaticae) l?om Middle Jurassic, Yima Formation, Henan, China ......

ISOTOPE GEOLOGY AND MAGNETOSTRATIGRAPHY:

Casellato C.E., E. Erba, J. E.T.Channel1 & G.Muttoni - Integrated bio- and magnetostratigraphy of the Tithonian-berriasian interval in the Tethys ocean: implications for the definition of the Jurassic- cretaceous boundary......

J. Grabowski, .lHaas, E. Marton &A. Pszcdkowski-Magnetostratigraphyof the Jurassic/Cretaceous boundary in the Ukht section, Transdanubian Range, Hungary......

Vaclav HouSa, Petr Pruner, Vilitor Zakharov, Martin KoSt'cik, Martin Chadima, Mikhail Rogov, Stanislav Slechta & Martin Mazuch - Principal results of Bored-Tethyan correlation of the Jurassic- Cretaceous boundary by magnetostratigraphy......

Lintnerovci O., Michalik J., Rehhvci D., Halasova E., BiroA A. - C-isotope stratigraphy of the TIJ and J/K boundary "key profiles" of the Western Carpathians : correlation with other stratigraphic proxies.. ..

Jdzsef PalfL - The quest for refined calibration of the Jurassic Time Scale......

Piotr ZiMkowski, Magdalena Sidorczuk & Marek Lewandowski - Magnetic phases from some Jurassic carbonates of north-Tethyan basins......

TECTONICS AND GEODYNAMICS :

Attar Hafidha A., Chalouan, M. EL Alji - The Meso-Cenozoic Evolution of Guercif Basin reconstructed from Seismic Lines interpretation......

Ibouh H, Ettaki M. & CheNai E. H. - Tectonic control of the lower Jurassic deposits of Todrha Dades In the south edge of central High Atlas, Morocco......

Galina L. Kirillova - Late Jurassic riftogenesis at the continental margin of the Russian Far East and its sedimentological and paleogeographical records......

Mohsen Rabhi, Houcine Chekhma & Mongi Chikhaoui - Jurassic Palaeotectonic schema of central and northern Tunisia......

Andrej Smut & BoStjan RoiiC - Julian High: example of drowned Jurassic from Julian Alps (East- Southern Alps) ...... MINERAL RESOURCES AS ECONOMIC POTENTIAL :

Adnan Diiyen & Ercan Siimer - Triassic-Jurassic marbles in ophiolitic series at Kararnan, Central Turkey......

Kocak, K .& Bas, H. - Geochemistly of the Jurassic extrusives in relation with evolution of the Neotethyan Ocean hmcentral-western Taurus Mountains, southern Turkey......

Mohsen Layeb, M. Boughdiri & Abiri Abdelkerim - : Petrographic and biomicrofacies characteristics of the Tunisian Jurassic stones used in ornamental, sculpture and mosaic archaeological and modern works......

Ali Rlra Sogiit & Mehmet Salim Oncel- Upper Jurassic-Upper Cretaceous aged Hac~alabazformation: Source rocks of the iron-rich bauxites in the Sarkikaraagaq and Yalva~regions, SW Turkey......

Veysel Zedef & Tevfik Agaqayak - Some geological and geochemical features of lateritic Ni and Fe occurrences in serpentinites over the Jurassic basement, Eski~ehir,Turkey......

POSTERS

Benyahia M., Marok A., Kerfouf A., Rahmani A. et Moueddene K. THE MLconnais Limestones (France): an example of storm deposits during Aalenian-Bajocian......

Hayet Chihi - Fault system analysis of the Zeuss-Koutine aquifer (Southern Tunisia): New insights into reservoir modelling......

Daoudi Lahcen, Medhioub Mounir, Soussi Mohamed & Jarnoussi Fakher - Palaeogeographic and diagenetic controls on clay minerals occurrences in the Jurassic sediments compared between the western High Atlas (Morocco) and the Tunisian Atlas......

Khadija El Hariri, Ali Bachnou & Maria Helena Henriques - Morphological and morphommetrical discrimination of two populations of Leioceratinae (Ammonitina) fiom Morocco and Portugal......

HaJaji Walid, Hachani Mondher, Jeridi Kamel, Soussi Mohamed, Lopez-Galindo Alberto, Rocha Fernando, Labrincha Jocio and Jamoussi Fakher - Potential use of Late Jurassic clays of Central Tunisia in ceramic tiles manufacturing......

Marok A., Hadji F., Sebane A., Soulimane C. Benyahia M. - Quantitative biogeography of the Upper Aalanian-lower Bajocian ammonites (Western Tethys)......

Nie&iedzki Gnegon , Zbigniew Remin, Grzegorz Pierikowski - Preliminary report about spectacular Late Pliensbachian Dinosaur Trackisite kom the Holy cross mountains, Poland......

Reolid Matias, Abad Isabel, Martin-Garcia J. Manuel - First record of plinthic palaeosol hmthe Middle-Upper Jurassic unconformity of South-Iberian Palammargin (Betic Cordillera, SE Spain)...... Reolid M. , AM, LM.Nieto, P.A. Ruiz-Ortiz, J.M. Molina & K. El Kadiri - Ferruginous crusts of the Middle-Upper Jurassic unconformity of the Betic External zones (SE Spain) and Dorsale calcaire (Morocco)......

Agnieszka Sobstyl - Origin and stratigraphy of the Wapienik Breccia member, Pieniny Klippen Belt, Carpathians, Poland - a preliminary report...... FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008

Acknowledgments

Under the auspices of Mr. the Minister of Higher Education, Scientific Research and Technology, the fifih international symposium of the UNECO-IUGS IGCP project 506 is held in Tunisia for the first time (Hammamet, March 2&31, 2008). fie Organizing Committee has the honor of inviting you to participate in this scientific meeting on the Jurassic system: global correlation and major geological events. We would like to thank the Presidents of universities and Deans of the organizing institutions (the Faculty of Sciences of Bizerte and the Faculty of Sciences of Tunis). We are grateful to the Presidents of the organizing associations (ATSN (section Nor4 and ATEIG) and the General Directors of ONM, ETAP and CERTEfor their technical andfinancial support. Great appreciations go to the Heads of the research structures and institutes: Lab. of "Gtoressouces" - CERTE; UR99/10-04; GRM 04/UR/10-01; Lab. of "Gtomatique et Geosyst2mes" (FLHM) and ISAM of Siliana)for their fruitful participation and helpficl efforts.

O/B the Organizing Committee; Prs: M. Boughdin & M. Soussi, Chairmen FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31, 2008 FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31, 2006

SYlPOSIUl PROGR11111 CONFERENCE CENTER OF "DIAR LEMDINA" HOTEL FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia).March. 28-31. 2008

WHO^-I k30: COFFEE BREAK

TTR5~W~iwcr%BE~sAND PALAEOECOLOGY Convenors: J. SHA & B. L. MARQUES

16H30-16H50 Popa, M.E. & Kedzior, A. - Vertebrate burrows in the Lower Jurassic continental Steierdorf Formation, Romama 16H50-17H10 Ana Mrirguez-Aliaga, Susana Damborenea & Antonio Goy - A preliminary study of Hettangian Bivalves from the Triassic-Jurassic passage beds in northern Spain. 17H10-1M30 Michal KROBICKI, Driss SADKI, Jan GOLONKA, Anna PLONKA, Urszula PREDKI & Anna RUSIN - Early Jurassic Lithiotis-facies deposits in northern Africa (Morocco; Assemsouk section) - case study. 17H30-17H50 Sun Bainian, Xie Sanping, Yan Defei, Li Xangchuan and Wen Wenwen - Cuticular character of Jurassic fossil plants as indicators of palaeoenvironmental change in China 17H50-18H10 Jiang Bao-Yu, Sha Jin-geng & Pan Yan-Hong - Some Early Jurassic non-marine bivalves from the southern Junggar Basin, NW China. 18H10-18H30 Bachnou A. & Boughdiri M. - Morphornmetric shape analysis of Upper Tithonian calpionellids : examples from Northern Tunisia and Moroccoan Prerif 20H30: GALA DINNER

SESSION 3 B~ODNERSITYCHANGES AND PALAEOECOLOGY Convenors: Y. WANG & K. -LATRACHE BEN ISMAIL

10H50-11H10 Roman Aubrecht, Jan Schlogl, Michal. Krobicki, Hubert Wierzbowski, Bmnislaw Andrzej Matyja & Andrzej Wierzbowski - Middle to Upper Jurassic stromatactis mud- mounds in the Pieniny Klippen Belt (Carpathians) - a clue to the origin of stromatactis. 1 1H1 0-1 1H30 M. Ourribane, E.H. Chellail, M. Soussi, D. Zaghbib Turki & B. Oujhaine - The Upper Jurassic reefs in the maghrebian Atlas (Morocco, Tunisia). ll H30-11 H 50 Jingeng Sha, Huawei Cai, Yanhong Pan, Yaqiong Wang, Xaolin Zhang & Xiaogang Yao - The Jurassic System of Qinghai-Xizang (Tibet) Plateau, China. 11H50-12H10 Ricardo M. Palma, Josi, Ldpez Gdrnez, Ricardo D. Pietht Diego A. Kietnnann & Susana Adamonis- Oxfordian reef architecture of the La Manga Formation, NeuquCn Basin, Mendoza Province, Argentina 12H10-12H30 Xiang- Wu Wu, Xiao-Ju Yang & Bo-Le Zhang - Sinoljeune yimaensis gen. nov. et sp. nov. (Hepaticae) from Middle Jurassic, Yima Formation, Henan, China

T: INTEGRATED STRATIE-RAPW Convenors: G. PIENKOWSKY & D. TURK1 14H45-15H05 Vasily V. Mitta - The Bajoc~an-Bathon~anboundary in European Rusia 15H05-15H25 Yongdong Wang, B~hongFu, X~aoprngXe, Guodong Zheng, Gang Li, Xaoju Yang, Yanhong Pan, Qing Nl& Ning Ean - The non-marine Upper Triassic and Lower Jurassic sequences in the Sichuan Basin, SW China with special references to the T/J boundary: a preliminary account. 15H25-151-145 Hadgi F, Marok A., Sebane A., Benyahia M., Mehiaoui R., Bounoua B. & Soulimane C. - Preliminarv results on the Toarcian bio-gee-events- in the Traras Mounts (Northwestern ALGERIA).- 15H45-16H05 Tanfous Amri D,Soussi.M, B6dir.M &Azaeiz .H - Seismic sequence stratigraphy of the Jurassic of Central Atlasic Tunisia

qi%TiJQ16~30: COFFEE BREAK FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31, 2008

Wssr OR2: ~E~M~~LOG~ANDTA~~OE~OWMEN~ Convenors: M.SOUSSI & N. MORTON

16H30-16H50 Abdellah Ait Addi & Mohamed Ettaki - Jurassic event sedimentation in the Central High Atlas, Morocco: an ove~ew. 16H50-17H 10 Sofiane Haddad , Mohammed Soussi & Mabrouk Boughdiri - Storm-generated calcareous tempestites and coarse carbonate breccias in pelagic facies (Upper Toarcian- Aalenian, Northern Tunisia) 17H10-17H30 Bressan Graciela S & Palma Ricardo M - Trace fossil assemblages from Lower Toarcien-Lower Bajocian siliciclastic marine platform, Neuqukn Basin (Argentina). 17H30-17H50 Milvio Fazzuoli - The mid-Jurassic marine transgression in East Africa: the Bihen limestone (Callovian- ? Early Oxfordian), Northern Somalia. 17H50-18H10 Be1 Kahla A, Boudagher-Fade1 M., Soussi M. & Bosence D. KJ- First characterisation of Early Jurassic (Sinemurian) from shallow marine carbonates of the South-Tethvan ~ar~i~of~unisia.. 18H10-18H30 Ricardo M. Palma & Diego A. Kietzmann - Shallow-burial diagenetic Realm of Upper Jurassic carbonate ramps: La Manga Formation, Neuqukn Basin (Argentina)

730-9~20:PLENARY SESSIO%

: ~SO~~PEGEOLOGY AND MAGNE '

I I Mikhail Rogov, Stanislav Slechta & Martin Mmuch -Principal results of Boreal-Tethvan I I correlation of the Jurassic-Cretaceous boundary by magnetostratisaphy. 1OHOO-lOH20 I Piotr Zidkowski, Maxdalena Sidorczuk & Marek Imandowski - Manetic ohases from I some Jurassic carbonates of north-Tethyan basins.

I

*-- ~ -* - -.w4ee 10HZO-1OH50 : ~TFKER~K

SES~ON~:TECTOMC~AND GEO""DYN~ICS Convenors : E. CHELLAI & MM. TURK1 10H50-11H10 Galina L. Kinllova - Late Jurass~critlogenes~s at the continental margin of the Russian Far East and its sedimentological and paleogeographical records. 11H10-11H30 Mohsen RABHI, Houcine CHEKHMA & Monxz- CHIKHAOUI - Jurassic Palaeotectonic I schema of central and northern Tunisia. 11H30-11H50 I ~ndreigmuc& BoStian RoiiE- Julian High: exarnvle of drowned Jurassic f?om Julian Alps @st- southern Alps) 11H50-12H10 Ibouh H, Ettaki M. & Chellai E. H. - Tectonic control of the lower Jurassic deposits of Todrha Dades In the south edge of central High Atlas, Morocco. 12H10-12H30 Attar Hajdha A., Chalouan, M. EL Alji - The Meso-Cenozoic Evolution of Guercif I Basin reconstructed from Seismic Lines interpretation FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisie). March. 28-31. 2008

14H30-15H : PLENARY SESSION ~.-~~~~~mng~.&assicstages - what do we requik for acgiiful &X%;? SESSION l:INTEGRATED STRATlGRAPHY Convenors: F. OLORIZ & A. BACHNOU 15H00-15H20 Ricardo M. Palma, Javier Martin-Chivelet, Jost Lbpez Gdmez, Andrea Concheyro & Marina Lescano High-resolution cyclostratigraphy analysis fkom a Tithonian marl- limestone alternating succession, Vaca Muerte Formation, Neuquh Basin, Mendoza, Argentina 15H20-15H40 I C.E.Casellato, N. Rameil & JSchnyder - Integrated stratigraphy- - - of Upper- - Kimmexidgian-- 1 I Upper Berriasian interval- Clue de-~aulannesection (SE France). 15H40-16H00 1 Sallouhi H. & Bounhdiri M. - Calvionellid successions through the Tithonian-Beniasian 1 series of the Tunisian Trough

SINESS MEE%NC&CL~S~N"~ I lDAY March 29th, 2008 (ROOM CE~

SESSION 4: ISOTOPE GEOLOGY AND MAGNETOSTRATIGRAPHY FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2006

IN MEMORIAN

SERGE ELM1 RENE MOUTERDE MILOS RAKL~S VACLAV HOUSA FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammemet (Tunis@. March. 2831. 2006 IN MEMORY OF SERGE ELM1 (1936-2007)

by Raymond ENA Y (Univ. Lyon 1, France) (Tramlatbn: N. Movton)

On the 27th January 2007 Serge ELM1 left us after a short but inexorable illness. In September we were, with our wives, together in Krakow at the 7th International I Congress on the Jurassic System where Serge presented several papers on the Pliensbachian- Toarcian. In October he was part of the jury for a thesis and nothing gave warning of his illness, even less of such a rapid deterioration. Born in Saint Etienne, Serge ELM1 was educated there up to his baccalaureate, obtained in 1W. He then studied at the University of Lyon from 1956 to 1960, the year .when he . achieved his 'Diplbme d'ttudes Sup6rieures" and passed the examination as Teacher of Natural Sciences.

The subject of his DES, "Le Jurassique infkrkur et le Bajocien de /a partie sud-ouest de I'ib Cr6mieuN,indicated the main direction of his future research and was part of the renewal, at that time, of studies on the Jurassic interrupted after F. Roman. In 1960 he accompanied me to the Colloquium on the Lias at Chambbry and in 1962 we were together at the First Cdloquium on the Jurassic at Luxembourg.

The Lias and the Middle Jurassic of the Ardbche border of the Massif Central was the subject of his doctoral thesis (Dodorat d'ctat) which he was awarded in May 1968, in the middle of all the uncertainties of this disturbed period! His monograph, in the Lyon tradition, included both a detailed stratigraphic study based on rigorous field observations and a palaeontological section on the oppeliids of the Middle Jurassic. Except for a period in Oran, Serge ELM1 pursued his career as teacher-researcher at Lyon. At first, from 1958 to 1960, he was an instructor in the Earth Sciences Department while he prepared for his DiplGme d'Etudes Sup6rieures and Teacher's Certificate (Aggregation), then as Assistant and, in October 1962, as Maitre-Assistant. His thesis completed successfully, Serge was seconded to the University of Oran as MaTtre de Conf6rences (Senior Lacturer) from December 1968 to September 1973, at first as a military then as a foreign affairs appointment. Returning in September 1973 to the Earth Sciences Department at Lyon as MaTtre Assistant, Serge became successively Professor 2* rank (August 1979), then letrank (January 1995) finishing his career as Professor of exceptional rank (1998). Remaining in post beyond the age limit, he retired in 2004 with the title of Professor emeritus.

The main line of Serge's research had emerged since his DES work on the Ile Cr6mieu and was more fully developed with his thesis of Doctorat d'Etat on the Ardkhe margin and during this time in Algeria two field areas to which he remained attached right to the end. The two main themes were the stratigraphy and biostratigapisy of Jurassic successions and faunas, especially of the Lower and Middle Jurassic and the palaeontology ofthe ammonites of these Series. His attachment to the Ardeche region led him to extend his field of interest to other periods in the histoty of the Ardkhe margin, such as the Triassic and the Upper Jurassic, to other aspects of geology such as sedimentdogy and palaeogeography and to relationships between tectonics and sedimentation. He was thus one of the kingpins of the 'Cevenol margina- site of the BRGM programme 'G6obgie profonde de la France: As collaborator of the 'Service de la Carte gBologiquenof France, he undertook the mapping of the sedimentary part d the Aubenas sheet.

Serge would develop these same themes in other countries where he extended the field of his research. Most important is North Africa, especially Algeria to where he returned often, then Morocco as an extension of his work on western Algeria. Within the scope of his research, canied out alone or in collaboration. he supervised or directed many thesis topics and trained numerous Algerian and Moroccan geologists many of who6 are now teachers- researchers in different Algerian and Moroccan R. ENAY, S EZlJl md their .wires n krakow universities. {Gaiar dmner in the 62 mine) I

His great experience and international reputation in Jurassic stratigraphy were often made available. He participated in the Tethys and Peri-Tethys Programmes and in syntheses such as "Biostratigraphie du Jurassique nord-ouest europeen et mediterran&ennand nSynth.3se du Bassin du Sud-Est de /a France: He was equally involved in the organization of scientific meetings or congresses, in particular the Colloquium on Amnonitico Rosso (Rome), the 31d International Symposium 'CBphalopodes actuels et fossiles" - Symposium F. Roman (Lyon 1990). His active participation in numerous collquia and congresses is not less: in particular, since his participation in the first, at Luxembourg in 1962, he has not missed any of the SymposialCongresses of the International Subcommission on Jurassic Stratigraphy - right up to that in Krakow, in September 2006. It is within the framework of this Subcommission that he led the Working Group on the Pliensbachian-Toarcian boundary and the search for the GSSP.

Serge was also involved in administrative responsibilities, at national level (elected representative of MaitrsAssistants to the Comith Consultatif des Universiths, 1965-1968), but more especially in his university: Director, successively, of the Dhpartement des Sciences de la Terre, of the lnstitut TOAE (Terre, Ocean, Espace, Environnement) and of the U.F.R. des Sciences de la Terre, Vicepresident of the University Claude-Bernard, responsible for personnel management).

Serge ELM1 was promoted Chevalier in the Ordre des Palmes academiques in 1984, and Officier in 1990 [decorations for services to education in France].

Everyone who came near him, students, collaborators and colleagues, were impressed by his love of geology, his scientific curiosity, his ability ta bring together the data of his pupils and transform them into numerous publications. Thus he leaves behind a body of work which is important for its quantity and quality and which will remain a foundation for future studies on Jurassic successions and ammonites. IN MEMORY OF MILOS RAKUS (8 November 1934 - 23 May 2005)

Petr pruner', Jan ~chliigl~& Martin ~oH'dkj

'Institute of Geology ASCR v.v.i, RozvojovA 269, 165 02 Prague 6, Czech Republic '~epartrnentof Geology and Paleontology, Faculty of Science, Comenius University, Bratislava, Slovakia 3Charles University of Prague, Albertov 6, 128 43, Prague 2, Czech Republic

Born on November 8h1934 in alina (Slovakia)

Education

Comenius University of Bratislava, Faculty of Geologiogeographic Sciences (1953), later at Charles University of Prague, Faculty of Science: Dr. I - specialization - palaeontology (1958) - CSc. (Ph.D.): Charles University 1969 Professional employment record

19582005 : researcher, Geological Survey of Dion* StQr,Bratislava

1963-66 : scientific expert of Service Geologique of Tunisia, Universidad de Oriente

1969-71 : researcher, scientific expert in Tunisia

1972-75 : chairman of the Slovakian Geological Society in Bratislva

1975-79 : researcher, scientific expert in Tunisia, PZO Pdytechna Prague from 1985 : member of stratigraphic cornittee I Field of research

Since 1958, he worked in the field of lithostratigraphy,regional geology and palaeontology of Slovakia (Povaae, V& Fatra, Nizke Tatry), scientific results were summarized in .BiofazieMe Studien irn Lias der Grossen Fatra und des westlichen Teils der Niederen Fatran (1961-1964, together with Prof. M. MiSik). 1963-1966 he participated as an expert of Service Gbbgique de Tunis& in the research of Mesozoic formations in Tunisia (regions of Grom-Balie and La Goulette, and Triassic areas in Southern Tunisia - Djebd Nara) From 1966, he worked in Central and W&m Carpathians. In 1969, he returned back to North Africa and worked in the Tunisian Ridge (Jurassic and Neogene Formations) and Morocco (1975-1979, East High Atlas and Mts. d'oujda). 1984-1989 head coordinator of the UNESCO IGCP project N0198 .Evolution of the Northern Margin of Tethys' including areas from the Alps to Caucasus (Atlas of palaeogeographic maps .Evolution of the Northern Margin of Tethys' - the results of IGCP Project 198, vol. 1.-Ill., 1988-1990 - eds. M. RakQs, J. Dercourt, A. Nairn). From 1991-1 997 he was a leader of the project .Geodynamic development of Western Carpathians. He is one of main authors of Geological map of Slovakia (1:500000). During his professional career, author or co-author of dozens papers in national and international journals, participant of International Symposia and supervisor of many diploma and PhD. thesis. FFTH INTFRNATIONAL SYMPOSIUM OF IGCP 006- Hammarnet (Tunisia). Mara28-31. 2008 selected publications

- Rakus, M. et al., 1988 - 1990 : Evdution of the Northern margin of Tethys. Published by ESRI, GUDS and SGF occasional publ. ESRI, New series 3, 4, vols. 1-111 - Soussi, M., Enay, R, Mangdd, C., M'Rabet, A., Rakus, M. & Rabhi, M., 1991: Datation par ammonites des series et des discontinuitb du Jurassique de I'Axe Nord-Sud (Tunisie Centrale). Comptes Rendus de I'Acadernie des Sciences, Paris, s&ie 11, 312, 501-507 - RakOs, M., 1993 : Early Liassic ammonites from the Steinplatte - Kammerkohralm area (Northern Calcareous Alps, Salzburg). Jb. Geol. B.-A, 136, 4, 919-932 - Rakb, M., 1998: Geodynamic development of the Western Carpathians. Introductory notes. In. Rakus, M. (ed.), Geodynamic development of the Western Carpathians, Dion)iz &Or Publishers, Bratislava 9-1 3 - RakOs, M. & Guex, J., 2002: Les ammonites du jurassique inferieur et moyen de la dorsale tunisienne. Mhoires de Ghlogie (Lausanne), 39, 21 ?p. - Schlogl, J., Elmi, S., Mangold, C., Rakis, M. & Ouahhabi, M., 2006: Specialization and iterative evolution of some Western Tethyan Bathonian ammonites [Benatinites (B.) nov., (B.) Lugariceras nov. and Hemigarantia]. Geobios, 39, 113124 FFTH INTFRNATIONAI SYMPOSIUM IGCP 506--

IN MEMORY OF VACLAV HOUSA (7 April 1935 - 25 September 2006)

Petr pruner', Jan schldg? & Martin KOSYB~~

'Institute of Geology ASCR v.v.i, Rozvojovh 269, 165 02 Prague 6, Czech Republic 2Departmentof Geology and Paleontology, Faculty of Science, Comenius University, Bratislava, Slovakia 3Charles University of Prague, Albertov 6, 128 43, Prague 2, Czech Republic

Mild &his (on the lejii and Vdclav HouSa (in the middle) fiiendly discussing in the field base station in the Carpathim

VACLAV HOUSA is born on April 7* 1935 in Chslav

Education

Charles University of Prague, Faculty of Science: Dr. specialization - palaeontology (1958) CSc. (Ph.D.): Charles University 1965 Professbnalemployment record:

1958-67 researcher, Geological lnstitute CSAS, Prague

1967-72 scientific expert Academy of Science of Cuba, Universidad de Oriente

1972-92 researcher, Geological lnstitute CSAS, Prague

1992- 96 director of Geological lnstitute CSAS, Prague

1996- 2007 senior researcher, Geological lnstitute CSAS, Prague Field of research

His first research activities were concentrated into the Uppw Cretaceous Formations ofthe Bohemian Cretaceous Basin and the Upper JurassicRowewr Cretaceous sediments of StrambekHill, Northern Moravia. Since 1980, he is a member of the Working Group for the Juassic/Cretaceous boundary, it partidpates in its working programme and, in recent times, also in its Meetings (1973 Lyon, Neuchatel, 1987 Pergola II, 1990 Pergola 111, 1993 Coimbra). He is acquainted with detail problems of biostratigraphy of the JurassiclCretaceous boundary strata. Specialhation for the JwassiclCretaceous boundary, in respect to the most sigdficant biostratigraphic groups - calpionellids and ammonites. Detailed knowledge of biostratigraphy af the Tithonianlserriasian boundary strata on Cuba. V. HouSa was a head of the Grant d The Grant Agency of the Acad. Sci. of the Czech Republic "Magnetostratigraphic correction d biostratigraphii correlations of JurassiclCretaceous boundary series. - During his prdessional career, author or =author of 90 papers in national and intematibnal journals.

- HouSa V., Krs M., Pruner P., Venhodovh D., Cecca F., Piticdo M., Oloriz F., Tavera J. M., 1999: Magnetostratigraphy and micropalaeontology across the J/K boundary strata in the Tethyan realm. International Geological Conference Carpathian Geology 2000, Gedogd Carpathha, 50, special issue, Bratislava, p. 33-35. - HouSa V., Krs M., Man O., Pruner P. and VenhodovA D., 1999: Conelation of mag~ostrabigraphy and calpionellid biostratiiraphy of the JurrasiclCretaceous boundary strata in the Western Carpathians. Geobgba Cerpathica, 50, 2, April 1999, p. 125144, Bratislava. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammarnet (Tunisia). March. 28-31. 2008

- HouSa V., Krs M., Krsova M., Man O., Pruner P., Venhodova D., 1999: High-resolution magnetostratigraphy and micropalaeontology across the JIK boundary strata at Brodno near iilina, western Slovakia: summary of results. Cretaceous Research, Vol. 20, No. 6, December 1999, Academic Press, London, p. 699-717. - Uchman A. - MikulaS R. - HouSa V., 2003.: The trace fossil Chondrites in uppermost Jurassic - Lower Cretaceous deep cavity fills from the Western Carpathians (Czech Republic). - Geologica Carpathica, 54, 3: 181-187. Bratislava. - Houia, V. - VaSiEek, 2.: Ammonoidea of the Lower Cretacreous deposits (Valanginian, Hauterivian) from Stramberk, Czech Republic. - Geolines. - HouSa V. - Krs M. - Man 0.- Pruner P. - Venhodova D. - Cecca F. - Nardi, G. - Piscitello M.: Combined magnetostratigraphic, palaeomagnetic and calpionellid investigations across the JurassicJCretaceous boundary strata in the Bosso Valley, Umbria, central Italy. - Cretaceous Research, 25: 771-785. London. - HouHa, V., Pruner, P,, Zakharov, V. A., KoSt'ak, M., Chadima, M., Rogov, M. A., Slechta, S., Mazuch, M., 2007: Boreal-Tethyan Correlation of the Jurassic - Cretaceous boundary interval by magneto- and biostratigraphy. Stratigraphy and Geologic Correlation, 15, 3, 297-309. FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hamrnamet (Tunisia). March. 28-31, 2008 FFTH INTFRNW28-31, W

IN MEMORY OF RENE MOUTERDE (1 9152007)

C. RUGET (Univ. Catholique Lyon)

Rene MOUTERDE (I'abbk (=Father) for the ancient geologists) leaved us, in the same discretion that characterized his life, on July 28th, 2007 in Vienne (Isbe, France).

Born in 1915 in Ambt5rieu, Rent5 Mouterde has lived a long career of scientist and priest. His father, a mine engineer for the saint Gobain factory, was named in Wasquehal where Redwill carry on his primary and secondary studies. After getting his Baccalaureate in 1932, he replies to his priesthood vocation and joins the St Sulpice Seminary of lssy les Moulineaux (Paris area) to make his philosophy.

For health reasons, he went back in his family at Lille where he obtained his Licence Diploma of ~aencesin 1936. In 1937, he leaved Lille and integrated the universitary Seminary of Lyon inorder to go on with his theology. He completed his scientific formation preparing a DES (High Studies Diploma) of Geology on the Liassic series of Paray le Monial area (1939). At Lyon university, he shared long moments with the Professor Roman and also prepared the Certificates of Mineralogy and Zoology (1942). After his military service done in 1940 at Vic de Bigorre, he had gone back to Lyon where he was ordonnated as a Priest, on June 2gm 1941, in the Fourviere Basilica and obtained his Licence of Theology, in 1942. The Diocese of Lyon proposed to Renb Mouterde to re-organize the laboratory of Geology at the Catholic University of Lyon and named him as a special lecturer (1943). The problem of the Thesis begun; G. Dubar (with the agreement of Professor Thoral) proposed his resaerch theme: cc The Liassic and Bajocian of the N and NE edges of the Massif Central )p. This wide research subject was to undertake during the war when food supplies and transport means were difficult; cc I'abb6 n had to travel all over hundreds of kilometers on bike, lodging among the parish priests of the villages he crossed. This thesis, defended in 1951 atthe lyonese university, is really a monument considering the wide covered area, the vertical stretch of the studied sections and the sampling wisdom and analysis. It is a reference for those who worked (or still work) on the Liassic. For that, Ren6 Mouterde was worth of three awards: the first by the Academy of Sciences and Arts of Lyon (1951) and the others by the Geological Society of France, in 1957 (Fontanes) and 1981 (Prestwich). During the 1990's, when the Catholic University of Lyon decided to close the laboratory of Geology, a convention was signed with the Lyon Museum of Natural History and all documents, manuscripts, plates and fossils of this thesis were classified and became the Museum's property. Rene Mouterde directed the sorting until some days before his death. This thesis triggered a very rich career of researcher and teacher. He attended colloquia, national and international congresses visiting museums to analyse Liassic collections of fossils. He warmly accepted to identify fossils (especially ammonles) for his colleagues and young researchers. His laboratory grew up and became a convivial center for biostratigraphers. He collaborated with the engineers of french well known companies (EDF, BRGM, Oil companies, etc).

The Rene Mouterde's domain extends early out of fronteers: Spain, Portugal, Morocco, Algeria, Germany, Hungary, Greece, Poland and even the Nepal. The Iberian Penninsula remained, until his last days, his main interest. In 1952, after the international congress of Algiers, he was conducted by G. Dubar to Portugal on the sections studied by Paul Choffat. He was warmly greeted by the geologists of the portuguese geological survey who accepted his collaboration regarding the lack of Jurassic workers. Since July 1953, he has begun the study of the Choffat sections with his own way, ie in detail; bed-by bed... Soon, he installed young researchers. In 1954, 1 have myself studied the Aalenian ammonites that showed special characters and later a thesis on the Dogger and Maim series to the North of Tage. Students of the U IGAL m prepared their diplomas by establishing geological maps; Roger Rocha had been among these young researchers before he became his dosest collaborator. In Spain, Ren6 Mouterde travelled all ovw Andalusia, the lberic Range and Asturias with A. Linares, M. Fontbat&, N. Llopis Llado. They are actually bosses and their attachment to RedMouterde is always present: Sixto Fernandes, Gay, P. Rivas. Morocco was also a stydy field thanks to young resaerchers among which were J. C. Faugkes and the younger students of the Claude Bernard university studying ammonites and foraminifera at the catholic university. He followed the field studies of those actually teachers at the universities of Marrakech, Mekne9, Oujda, Rabat, etc. ; all with the support of R Dudresnay and S. Umi. Known from all the Jurassic geologists by his various published papers with the collaboration of numerous colleagues, R Mouterde has been recognized by the geological community who homage him in difient ways: VicsChairrnan of the Geological Society of France, Member of the Lyon Academy of Sciences and Arts, Doctor Honoris Causa of the Usboa University, International Juries member ... But there is another life for Ren6 Mouterde, perhaps less known by the scientific community. He was a priest and scientific. He has always been wolking on Sdence and Faith problems and implied in various wolking groups at Palis, Lyon, Switzerland, Lowain... Thirty years ago, with his friend Henri Tintant, he created a small working group induding Scientists, Theologists and Phylosophers to discuss such problems in all serenity. Such a group rapidly grew up to range about 50 persons coming from Paris, Montpellier, Lille, Geneva, Grenoble. ...to work for one day per quarter. The subject is defined in advance, the specialist exposes for one hour and a half and discussions are delayed for after lunch. Several cdloquia were organized and the main papers were published in the uCahiers de SUniversit6 Cathdiquem (available l). Finally, there is a third life for Ren6 Mouterde: that, when somewhat free, he dedicated some more time to the pastoral life. Thus, for sventeen years, he assured the priest role in two villages of the Pilat area. This period was wonderful for him, he discovered in a dierent manner the rural life... and in return, his had a faithful and friendly contact for this priest-scientist who knew how to explain to them their envirorment.

In one of these villages, Ren6 Mouterde preferred to take a rest; his funerals were celebrated in one of the churches in presence of his parishioners of course but also of geologists coming from Lyon, Paris, Marseille and GrenoMe. Our colleague from GrenoMe, the Messor Jacques Perriaux, expressed a homage to U I'abb6 m saying :

U In the wake of TheilIard de Chardh, Red Mouterde knew, durhg all his 11% how to realhe a happy synthesk between Science and Faith and to be an active dness of Creation that he contempletes henceforth m

(1): Christiane Ruget, Chiper route de Pimoth, 69420 Tupin et Semom, France. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2008

HONORARY GUESTS:

DURAND DELGA M.

ENAY R.

JELLOULI A.

MEMMl L. FFTH INTERNATONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2004 FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammarnet (Tunisia). March. 28-31. 2008

ABSTRACTS FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31, 2008 FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisi ). March. 28-31. 2008

Session I :

INTEGRATED STRATIGRAPHY FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 24128 FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Harnmamet (Tunisia). March. 28-31, 2006

FIRST CHARACTERISATION OF EARLY JURASSIC (SINEMURIAN) FROM SHALLOW MARINE CARBONATES OF SOUTHERN TETHYAN MARGIN OF TUNISIA

BEL KAHLA A.', BOUDAGHER-FADEL M.', SOUSSl M.' and BOSENCE D.W.J.' l. Facult6 des Sciences de Tunis, Dbpartement de GBologie campus Universitaire, C.P. 2092, Tunisie. 2. Department of Earth Sciences, University College London, Gower Street, WClE 6BT, UK. 3. Department of Geology, Royal Holloway University of London, Egham, SURREY, TW20 OEX UK

The early Jurassic carbonate platforms of the southern Tethyan margin outcrop in Tunisia along the North-South Axis (NOSA) and the Tunisian Range and its satellite mountains. These carbonates (Oust or Nara formations c300 m thick), are organised into peritidal cycles deposited in an extensive, shallow marine platform. Previously they have been attributed to the Hettangian-Sinemurian without reliable palaeontologic evidence. At Jebel Aziz, the succession is 21 5m thick and can be subdivided into two major distinct lithologic units Unit 1 is represented by three sub-units charcaterized each by repetitive cycle organisation; Sub-unit 1 is represented by limestones and dolomites organised in metric cycles ranging from subtidal to supratidal environments with emergent surfaces indicated by the presence of caliche crusts and pisoids. Sub-unit 2 is mainly composed of limestones. It is marked at its lowermost part by an important channel system followed by numerous neptunian dykes. Cycles of this unit are thicker and show less evidence of emergence. Subtidal facies (peloidal bioclastic pack-grainstones with benthic foraminifera and thaumatoporellid microbial structures) are well developed. Sub-unit 3 is composed of limestones arranged in a few cycles dominated by subtidal facies (peloidal and shelly packstone-grainstone with benthic foraminifera) increasing in thickness from base to top. Unit 2 does not show cyclicity and is composed of massive limestone beds rich in oncoids and benthic foraminifera indicating a deepening upwards subtidal environment. Benthic foraminifera identified within Unit ? at the base of sub-unit 2 and in several intervals of sub-unit 3 suggest an early Sinemurian age (Siphovalvulina colomi, Siphovalvulina gibraltarensis, Siphovalvulina sp., Riyadhella praeregularis, Duotaxis metula, textulariopsis sp). These benthic foraminifera occur with calcareous algae Paleodacycladus? Mediterraneus and the problematic Thaumatoporella? Pan/ovesiculifera. The lower part of Unit 2 shows the same foraminiferal association with the addition of Everticyclamina praevirguliana, indicating middle-late Sinemurian, together with Pseudocyclammina sp. and the alga Cayeuxia ?piae These dates are the first records of Sinemurian ages within these early Jurassic carbonates The Bent Sai'dane succession is of 170m thick and is also subdivided into two major units. As in Jebel Aziz. Unit l carbonates are arranged in peritidal cycles and can be subdivided into three sub-units. Sub-unit 1 is composed of limestones showing peritidal cycles, ranging from subtidal, intertidal to supratidal environments. Facies are mainly fenestral and peloidal packstones-Grainstone with abundant thaumatoporellids and rare benthic foraminifers. Sub-unit 2 is composed of limestones and dolomites organised in repetitive supratidal- intertidal cycles. Facies are similar to Unit 1 but with stromatolites and emergent l@FFTH INTE NAT intervals. Biota is mainly composed of thaumatoporellids and rare benthic foraminifers. Sub-unit 3 is composed of limestone and dolomite. Cycles of this unit are shallowing-up and include subtidal, intertidal and supratidal facies. Microfacies are mainly represented by peloids shelly intraclasts pakstone- grainstone with rare benthic foraminifera. Unit 2 is composed of limestones of subtidal environments displaying large bivalves (lithiotids), oncoids and benthic foraminifera. The benthic foraminiferal association cited above and indicating early Sinemurian is found in the lower first unit of Bent Sa'idane section, while those indicating middle-late Sinemurian are found in Unit 2. This new dating henceforth enables high resolution correlation of the cyclicity records of the two sections and their comparison with those already identified within the early Jurassic carbonate platforms of the Western Tethyan realm (Morocco, Spain, Italy and Greece).

INTEGRATED STRATIGRAPHY OF UPPER KlMMERlDGlAN - UPPER BERRlASlAN TIME INTERVAL - CLUE DE TAULANNE SECTION (SE FRANCE)

Casellato C.E ', Rameil N. 2, Schnyder J.

' ' . .. '~ep.of Earth Sciences, Univ. of Milan, Milan. Italy - ' InstitU fur Geologie. Mineralogm and Geophysik. Ruhr-UniuUM, -iameil UniversitB Pierre et Marie Curis - Paris 6, CNRS. Laboratoire de Tectonique-Equipe -Evolution et dynarnixasins &irnentairesm. Paris, France --.iussieu.fr

A multidisciplinary approach to Clue de Taulanne section (SE France), North-Western margin of Alpine Tethys, is presented. It aims to collect different stratigraphic data on JurassicICretaceous (JIK) boundary time interval to give a contribution to Southern Europe and hemipelagic Tethys paleoscenario. Lithostratigraphy, carbonate sedimentology, sequence startigraphy, biostratigraphy, clay minerals, magnetic susceptibility, chemostratigraphy have been independently investigated, covering a time interval from Late Kimmerigian to Late Berriasian. Lithostratigraphy, carbonate sedimentology, sequence stratigraphy and clay minerals have been used to establish a correlation between North- Western Alpine Tethys margin and Jura platforms (Rameil, 2005): it allows to relate changes observed in the basin to the ones recorded on carbonate platforms. Ammonite, calpionellid, nannofossil and pelagic microfossils biostratigraphies have been performed to date the section and correlate planktonic events to interpreted environmental changes documented on carbonate platforms (Rameil, 2005). Jura Mountains are a key area for the correlation between tethyan and boreal realms (Colombie & Rameil, 2007). 1 Exceptional ammonite discoveries allow in recognize ammonite zones spanning from Exodus to Occitanica Zones (tethyan province). The JIK boundary interval is characterized by a calcareous nannofossil speciation event and by the first occurrence of calpionellids: both groups first appear and rapidly evolve showing a progressive increase in degree of calcification (Remane, 1986; Bralower et al., 1989; Bornemann et al., 2003; Casellato & Erba, 2007). Calpionellids zones from Chitinoidella to C (Remane, 1986) and calcareous nannofossil zones from NJ-20 until NK-1 (Bralower et al., 1989) have been recognized. Magnetic susceptibility first results show two-step increase at the top of the section (between beds 393-394 andlor above beds 430-431), probably indicating increasing clay content vs carbonate. The clay mineral assemblage is composed of kaolinite, illite-smectite mixed layers and illite in various proportions. An increase of kaolinite proportion is recorded in the uppermost part of the section (from beds 394- 395). Clay mineralogy pattern could be interpreted as a climate change from a more humid climate, as has been also recorded at the Southern Tethys margin in Tunisia (Schnyder et al., 2005). Stable isotope analysis results show essentially the general stable well known trend for JIK boundary interval: erratic oxygen isotope trend is probably due to diagenesis; carbon isotope shows a negative overall trend and a negative excursion (=2%0 across 10-20 meter, 206-219 bed intervals) which seems to correlate with a negative excursion documented in the Ammonitico Rosso (e.g., Padden et al. 2002).

LATE JURASSIC FACIES SUCCESSION AND STRATIGRAPHY IN HUNGARY

Department of Palaeontology, Hungarian Natural History Museum. 1431 Budapest, Pf. 137

Hungary is situated in the central part of the Carpathian Basin, surrounded by the Alps, the Carpathians and the Dinarids. From a geographical point of view, the region is built up by extended plains and narrow ranges of moderate hills. Mesozoic (including Jurassic) rocks crop out in the mountainous areas and can be traced also in the basement of the young, Neogene basins. Due to the strong deformation of the Alp-Carpathian region, different tectonic units (terranes) can be found in close proximity to each other, showing different paleo(bio)geographic affinities, separated by major tectonic lines, running from NE to SW. The Jurassic of the Transdanubian Range (including the Pilis, Gerecse and Bakony Mts) contains relatively complete successions reduced in thickness, and successions with repeated non deposition, showing extreme condensation, close to each other. The "Middle Jurassic" radiolarite is covered by a few metres of Ammonitico Rosso and Biancone type carbonates, respectively. The major part of the nodular limestone is of Tithonian age, in certain levels of the Oxfordian and Kimmeridgian can be also documented. In some isolated outcrops Tithonian Hierlatz-type rocks occur yielding rare and peculiar ammonites. The facies pattern within this unit suggests an uneven sea bottom topography and the appearance of numerous cephalopod taxa show a clear Alpine-Mediterraneyn affinity. Many of the Late Jurassic Mediterranean ammonite zones can be traced on the basis of the rich megafauna.

The Jurassic of the Mecsek Mts in southern Hungary show considerable differences compared to the Transdanubian Range in thickness, lithofacies and fauna1 content. The thick, coal-bearing terrigenous Lower Jurassic and the marly and calcareous Middle Jurassic has a strong north-west European affinity, but for the Upper Jurassic succession a Submediterranean affinity can be inferred. The Late Jurassic ammonite assemblage of the Mecsek Mts is rather poor in comparison with the fauna of the Transdanubian Range. Oxfordian and Kimmeridgian ammonites were found only in a single locality, collected from a limestone bank. The few meter FFTH INTERNATKINAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 2&31. 2008 thick, reddish, nodular Upper Jurassic limestone yielded a moderately diverse Lower Tithonian cephalopod fauna in most of the localities.

UPGRADED SUDlVlSlON OF THE OXFORDIAN AND KlMMERlDGlAN AS A CONSEQUENCE OF RECENT CORRELATIONS

Glowniak Ewa, Mafyja Bronislaw A. & Wienbowski Andnej

Faculty of Geology, University of Warsaw, 02-089 Warszawa, twirki i Wigury 93, Poland

The primary standard for the OxfordianIKimmeridgian boundary, under the provision of the International Subcommission of Jurassic Stratigraphy of the IUGS, is the PseudocordataIBaylei Zones boundary in the Subboreal Succession. As a great part of stratigraphical interval hitherto considered the Submediterranean Upper Oxfordian correlates with the lower part of the Kimmeridgian, the lower boundary of the Kimmeridgian in the Submediterranean Upper Jurassic zonal scheme would be markedly lowered. The consequences of this change go much further than a simple shift of the boundary of the stages. The aim of this presentation is to show the upgraded proposal of the Submediterranean substage scheme considering the ISJS Stage recommendations.

The principal requirement as proposed herein is to applicate a uniform phylogenetical concept in definition of substage boundaries. The following ammonite groups fulfil1 this requirement: the families Perisphinctidae and Ataxioceratidae in the Submediterranean Succession, the family Aulacostephanidae in the Subboreal Succession and the family Cardioceratidae in the Boreal Succession.

The Middle Oxfordian divides into the Plicatilis and Transversarium Zones, but their boundary is not coeval with those used in the Western Europe, being drawn at the boundary between the Arkelli and Buckmani Subzones. With this boundary, the Plicatilis and Transversarium Zones accommodate two successive natural assemblages: the Otosphinctes - Kranaosphinctes and the Dichotomosphinctes- Perisphinctes, respectively. The lower boundary of the Upper Oxfordian is coeval with the lower boundary of the Wartae Subzone of the Bifurcatus Zone. The aim of this change is close correlation with the lower boundary of the Boreal Upper Oxfprdian marked by transition between Cardioceras and Amoeboceras. The major evolutionary event which occurs at, and defines the base of the Wartae Subzone and Bifurcatus Zone, is the phyietic appearance of the subgenus Dichotomoceras, and its macroconch counterpart of Perisphinctes.

The boundary between the Oxfordian and Kimmeridgian corresponding to the base of the Subboreal Baylei Zone (the flodigarriensis horizon) is placed at the transition between Ringsteadia (M) - Microbiplices (m) to Pictonia (M) - Prorasenia (m), which shows a good correlation with the lowest part of the Boreal Bauhini Zone marked by incoming of the subgenus Amoeboceras (Plasmatites). This boundary runs nearby the upper boundary of the Submediterranean Hypselum Subzone of the Bimammatum Zone. Thus, both the Bimammatum and Hauffianum Subzones of FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31, 2008 the Submediterranean Bimammatum Zone, and the Planula Zone should be accommodated in the Kimmeridgian.

This stratigraphical interval of the Submediterranean Succession with upper boundary at the base of the Galar Subzone correlates with the Boreal Bauhini Zone. Because of this, and its well defined character of ammonite fauna, it is proposed here as the Lower Kimmeridgian Substage. The stratigraphical interval of the Submediterranean Succession from the base of the Galar Subzone to the top of the Divisum Zone correlates with the bulk of the Boreal Kitchini Zone.

The upper boundary of this Submediterranean stratigraphical interval corresponds very closely to the base of the Subboreal Mutabilis Zone marked by transition from Rasenioides to Aulacostephanoides. The bulk of this stratigraphical interval of the Submediterranean Succession has been distinguished so far as the Lower Kimmeridgian, but due to recent correlations it becomes a middle part of the Kimmeridgian Stage. We propose, thus to distinguish it as the Middle Kimmeridgian Substage - the unit so far not recognised in the standard subdivision of the Stage. The boundary between the Middle and Upper Kimmeridgian corresponds precisely to so far distinguished boundary between the Lower and Upper Kimmeridgian at the base of the Acanthicum Zone of the Submediterranean Succession, and the corresponding base of the Mutabilis Zone of the Subboreal Succession.

PRELIMINARY RESULTS ON THE TOARCIAN BIO-GEO-EVENTS IN THE TRARAS MOUNTS (NORTHWESTERN ALGERIA)

HADJl F.', MAROK A.', SEBANE A.', BENYAHIA M,', MEHlAOUl R.', BOUNOUA B.' et SOULIMANE C.'

'~epartmentof Earth Sciences, Faculty of Sciences, University Abou Bekr Belkai'd, B.P. 119, Tlemcen, Algeria. E-Mail : fm [email protected] 'Department of Earth Sciences, Faculty of Earth Sciences, Geography and Amenagment of Territory, University Es-Senia, B.P. 1524, Oran, Algeria. 3~epartmentof Environment, Faculty of Sciences, Universitb Djillali LiabBs. B.P. 89, Sidi Bel AbbBs, Algeria.

To identify the various geochemical and biological events marking the Toarcian stage in the various sedimentary basins of western Algeria, we have found it useful to resume some sections for better understand the relationship between these events, often poorly defined, due to the discontinuous nature of sedimentary records and biostratigraphic diachronism.

In this context, we present in this study the first results obtained in the Mounts of northern Traras through fin Killoun section lifted for the first time by AMEUR (1988). It includes the following lithostratigraphic succession:

-ccBayada beds)) (22, 30 m) : It is represented by a regular alternation of marls-limestone rich in ammonites fauna (Hildoceras sp., Polyplectus pluricostatis, Harpoceras, Hildoceras cf. sublevisoni) passing to bioturbate and corrugated limestone. Towards the top, limestone beds, often decimetric, become more bioclastic and have delivered to us bivalve (posidonomys) associated with ammonites (Collinites, Collina and Osperleioceras) indicating the Gradata zone, Gemma subzone (Middle Toarcian). FIFTH 1NTERNATK)NAL SYMPOSIUM OF IGCP 506 - Hammarnet (Tunisia). March. 28-31. 2006

-ccTraras Ammonitico-rosso)) (14.75 m): It is an alternation composed of micritic limestone and reddish mar1 at the bottom. This facies is rich in small sizes ammonites. Some determined faunas indicate Bonarelli zone (Upper Toarcian).

-<

The study of benthic foraminifera in the middle and upper Toarcien shows the presence of four families (Nodosariidae, Nubeculariidae, Ceratobuliminidae and Spirillinidae). The Nodosariidae family, very abundant in the associations, is characterized by prevalence and persistence of Lenticulina genus (92 to 98%). This enabled us to distinguish an important period of diversity and renewal of microfauna located at Middle Toarcian (Bifrons-Gradata zone). Note that the species, Lenticulina chicheryi mg. Lenticulina, Lenticulina toarcence mg. Lenticulina and Dentalina pseudocommunis, present a long stratigraphic range (Middle and Upper Toarcian). Moreover, the geochemical analysis (CaC03 and TOC) and the binary evolution of beds (limestone)-inter-beds (marls) have shown, through the recorded peaks, the existence of a remarkable relationship between the environment deposit "Inferior Offshore", the nature of the sedimentary record and the phases of microfauna appearanceldisappearance. The correlation between its various parameters suggests that the mechanisms of the sedimentation control influence macrofauna and microfauna evolution. At the end, it is important to note that the different results obtained, confirm the absence of any anoxic phase during the time interval analyzed.

THE BAJOClANlBATHONlAN BOUNDARY IN EUROPEAN RUSSIA

Miita Vasily V.

Paleontological Institute of RAS, Moscow,

Late Bajocian - Early Bathonian ammonite faunae of Northern Caucasus are very close to West-European. But not only typical "Tethyan" taxa are distributed here. Besides, the endemic Northern Tethys parkinsoniids genera Pseudocosmoceras and Medvediceras were found here. These ammonites are widespread in the upper zone of the Bajocian below that Gonolkites and Oraniceras.

In Volga River basin these ammonites are very rare and mainly collected from talus. But recently the section was found near Saratov, where along with the typical sub-Mediterranean and partly sub-Boreal ammonites (Parkinsonia, Oraniceras and Pseudocosmoceras), the high-Boreal Arcticoceras and FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31, 2008

Arctocephalites were collected. As the result, the first proved correlation of the Boreal Bathonian middle part with the Standard was made. The following ammonite succession was established: Medvediceras masarowici -+ Oraniceras mojarowskii -, Oraniceras besnosovi -i Arcticoceras harlandi -, Arcticoceras ishmae. Numerous Parkinsonia s.str., that allows to correlate this interval with the top of Parkinsoni zone, were found in masarowici horizon. According to geologists, well- acquainted with the materials of boring, Pseudocosmoceras michalskii appears lower than Medvediceras. It allows to assume the michalskii horizon, lying under masarowici horizon, seriously enough; both these horizons compose the Michalskii zone of Russian platform, as equivalent of the mid-top part of standard Parkinsoni zone. The Besnosovi zone is characterized by Oraniceras and it is an equivalent of Convergens and Macrescens standard subzones. Probably, Arctocephalites freboldi, which were found not in situ, came from the upper part of this zone. It is possible to consider the upper part of Besnosovi zone as the freboldi horizon, taking into account the succession of East-Greenland arctocephalitins (Callomon, 1993). We have correlated the lshmae zone of Saratov area with the standard Yeovilensis/Tenuiplicatus subzones. Recently this correlation has been confirmed also by magnetostratigraphic researches (Pimenov et al., 2006). The key sections for Middle Jurassic of Northern Russia (Petshora) are the outcrops in lshma River basin. The latest researches, based on Callomon's data on the East Greenland, allow to identify the zones Arcticus (coll. Arctocephalites arcticus), Greenlandicus (coll. Arctocephalites freboldi), and lshmae (coll. Arcticoceras ishmae and A. harlandi) here.

Thus, the boundaries of zones Parkinsoni and Zigzag in Northern Caucasus, zones Michalskii and Besnosovi in Volga area, and zones Arcticus and Greenlandicus - in Petshora area correspond to the BajocianIBathonian boundary in the European Russia.

The study is supported by the program of the Presidium of the RAS "Origin and Evolution of the Biosphere".

Figure: Chronostratigraphical subdivision of the Bajocian-Bathonian boundary of European Russia and correlation with the West-European primary and East-Greenlands secondary standards. Preliminary established horizons are shown by dotted line. FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 2831. 2006

HIGH-RESOLUTION CYCLOSTRATIGRAPHY ANALYSIS FROM A TlTHONlAN ALTERNATING MARL-LIMESTONES SUCCESSION VACA MUERTA FOMATION, NEUQUEN BASIN, MENDOZA, ARGENTINA

Ricardo M. Palma "2' Javier arti in-chivelee Jos6, Lopez ~brnez~.,Andrea ~onche~ro'~~, and Marina ~escano'

Departamento de Ciencias Geol6gicas- Facultad de Ciencias Exactas y Naturales-UBA. Ciudad Universitaria- Pab. II (1428) Buenos Aires, Argentina. Consej: Nacional de lnvestigaciones Cientificas y TIcnicas (CONICET). Argentina lnstituto de Geologia Econ6mica-fCSIC-UCM) Madrid- Espaiia. ~o.ucm,es.il~

The Neuquen back-arc Basin is located on the west margin of South American platform between latitude of 36O and 40° S. The basin is worldwide famous for its continuous sedimentary from the Late Triassic to Cenozoic record comprising continental and marine clastic, carbonate and evaporitic deposits which are up to 2,600 m in thickness. The Tithonian-Valanginian deposits are represented by the Vaca Muerta Formation, which is widely distributed over all the Neuquen Basin, and consists of dark bituminous shales, marls and limestones cycles, which have been recently become the focus of a regarding interpretation of the cycles as responses to Milankovitchian influences.

Preliminary results of cyclostratigraphy based on sedirnentological and biostratigraphical studies on a well exposed Tithonian Vaca Muerta outcrops of three selected sections (Loncoche Creek, Salado River, and Quebrada Amarilla) suggest that the whole section developed during a time-interval spanning from the Lower Tithonian (Virgatosphinctes mendozanus) to the Upper Tithonian (Substeueroceras koeneni Zone). Nevertheless, the recognition of detailed studies of ammonite biostratigraphy from the Salado River section (184 m) shows lower Upper Tithonain (Corongoceras alternas Zone) up to Upper Tithonian (Substeueroceras koeneni). The three sections are characterized by a cmldm scale alternation of limestones and marls. From the beginning of Tithonian, beds in the Quebrada Amarilla shows no signs of fauna1 mixing and seems to be stratigraphically complete, but it represents a stratigraphical condensed section in relationships with another studies successions (Loncoche Creek, and Salado River). The nannofossil assemblage is typical for the Upper Jurassic that include Cyclagelosphaera deflandrei, C. margerelii, Diazomatolithus lehmanii, D. galicianus, Watzanueria barnesiae, W. britannica, W. fossacincta, W. ovata, Zeughrabdotus embergerii, and Z. erectus. Polycostella beckmanii, a Jurassic reliable marker has been also found. Spectral analysis of the Tithonian succession reveals the same signal for the studies outcrops. In the Salado River section (184 m), the couplet thickness varies between 6 and 78 cm, at a rate of 24 rnlMa. The detected periodicities are 147 ka, 118 ka, 102 ka, 54 ka, 48 ka, 36 ka, 20 ka, and 22 ka. The Loncoche section (154 m) the couplet thickness varies between 8 and 81 cm, at a rate of 96 m1Ma. The detected periodicities are 398 ka, 127 ka, 91 ka, 78 ka, 34 ka, 18 ka and 22 ka. The Quebrada Amarilla section (89m) the couplet thickness varies between 5 and 45 cm, at a rate of 17m IMa. The detected periodicities are 77 ka, 58 ka, 44 ka, 14 ka, and 23 ka. The results of the FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammarnet (Tunisia). March. 28-31. 2008 spectral analysis are strong indications that the Vaca Muerta succession in the Neuquen Basin was deposited under the influence of climatic changes induced by the orbital parameters. The peaks of 398 ka, 147 ka and 102 ka are related to eccentricity to the earth orbit. The peaks of 77 ka, 58 ka, 44 ka and 46 ka could be ascribed to the obliquity of the earth axis. The peaks of 22 ka, 18 ka, ka 23 ka, and 14 ka cycles are very close to them obtained from the precession values.

TIJ BOUNDARY IN CONTINENTAL DEPOSITS OF POLAND- IMPLICATION FOR GLOBAL CORRELATIONS

Pienkowski Grzegorz ', Niediwiedzki Grzegorz ', Marynowski Leszek 3, and Waksmundzka Marta '

'polish Geological Institute, Rakowiecka 4, 00-975 Warszawa, Poland; e-mail: zeaorz.~ienkowskihoai.aov.d '~e~artmentof Paleobiology and Evolution, Facuity of Biology, Warsaw University, uI~S.Banacha 2, PL-02-097 Warszawa, Poland; e-mail: [email protected].~I 3~acultyof Earth Sciences, Silesian Univezity, ul. Bpdzihska 60, PL-41-200 Sosnowiec, Poland; e-mail: ma~lows~wnoz.us.edu.~

Key-words: TIJ boundary, continental facies, palynomorphs, fern peak, neutron- gamma departures

Kamien Pomorski IG-l borehole from Pomerania, Western Poland yielded core material from the Triassic-Jurassic transition in continental deposits. Uppermost Rhaetian deposits represent alluvial overbank subsystems, floodplain, lacustrine and crevasse splay facies. This indicates a substantial limitation of depositional energy of the alluvial palaeoenvironment, which reflects both palaeoslope and probably local tectonic factor. Consequently, erosion at the sequence boundary located closely below the TIJ boundary was inconspicuous if any, which is an exceptional case in the Early Jurassic Polish basin, where usually Rhaetian deposits are missing or reduced from the top by erosion.

The principal aim of this study has been to locate the level of the microfloristic transition in this terrestrial section and see how these correspond to changes in C isotope values, biomarker spectra, and gamma-ray data.

Carbon-isotope values measured in the phytoclast fraction of palynomacerals show significant fluctuations in the upper Rhaetian interval with the prominent negative 613Corg excursion about 20 meters below the sequence boundary. Regarding to lack of core above the sequence boundary we are not sure if the second ("main") carbon isotope excursion occur within the uncored section - however, this is most probable.

Material from Kamieli Pomorski IG-l borehole yielded abundant palinological data. A total of 63 palynomorph taxa have been recorded: 42 spore taxa, 21 pollen taxa, and 1 Acritarcha indet. Three palynological assemblages (Pa) have been distinguished. Pal, which is typically Rhaetian, corresponds to the Rhaetipollis- FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammemet (Tunisia). March. 28-31, 2008

Riiccisporites Zone. Pa2 can be Rhaetian andlor Hettangian in age. Pa3, which is Hettangian in age, partly corresponds to the Pinuspollenites-Aratrisporites Zone. Palaeoecological analysis of the palynomorph assemblages indicates marked palaeofloral renewal, from low diversified, Late Triassic xerophilous plants (assemblage dominated by pollens) to a well diversified palaeofloral community at the Triassic-Jurassic transition and Early Jurassic time. After the turnover at the end of the Triassic, and especially during the earliest Hettangian time, the recovery of new species is well marked. Conspicuous floral turnover coincides with the sequence boundary. This point to the environmentallclimatic change (and concomitant biotic crisis) at this boundary. Taking into account presence of charcoal fragments, elevated concentration of unsubstituted, pyrolytic polycyclic aromatic hydrocarbons (PAHs) and high amount of terrestrial debris in the samples we suggest the presence of wildfires periods during TIJ boundary sedimentation (two or even three wildfire episodes). Distinct correlation between TOC amount and pyrolytic PAH concentration suggests that significant amount of organic matter present in TIJ clays originated from charcoalified and partially charred plants. The scanning electron microscope (SEM) observations reveals many charcoal fragments but they are rather small and often shreded and rounded which suggest intensive transport of particles before deposition.

This study shows that the most marked boundary (event) within continental deposits of RhaetianlHettangian interval is connected with sequence boundary and approximately coeval floral turnover. GSSP candidate boundaries based on marine sections occur usually higher - how much higher, depends on decision still to be undertaken by the Subcommission on Jurassic Stratigraphy. If this boundary will be defined at the first appearance of ammonites of Psiloceratidae family, the departure from the most characteristic continental boundary will be rather minor, but if the TIJ boundary will be placed at the lowest appearance of Psiloceras planorbis, the distance between these two boundaries will be quite significant.

CALCAREOUS MICROPLANKTON AND NANNOPLANKTON ASSEMBLAGES RECORDED IN THE WEST CARPATHIAN LATE JURASSIC I EARLY CRETACEOUS SEDIMENTARY SEQUEN~ES- TOOLS FOR BIOSTRATIGRAPHY AND PALEOENVIRONMENTAL RECONSTRUCTION

Rehakova D. l, HaldsovB E. '

'~epartmentof Geology and Palaeontology, Faculty of Natural Sciences. Comenius University, MlynskA dddina G-l, 842 15 Bratislava, Slovak Republic; e-mails: rehakowm-

We discusses the results of an integrated study of three microplankton groups (calpionellids, calcareous dinofla ellates and calcareous nannofossils) and partialy with the stable isotope data (6' P0, 613c) as well, in the Late Jurassic and Early Cretaceous pelagic sedimentary sequences of the Western Carpathians which are lack of ammonite fauna. At that time, calcareous microfossils and nannofossils were the most important constituents of tropical and subtropical plankton assamblages. Calpionellids rarely dominated over the phytoplankton associations and they were always eliminated in environments in which radiolarians prevailed in abundance. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2008

The bio-events investigated emphasises the potential of these planktonic groups as proxies in biostratigraphy, palaeoecology and palaeoceanography. The stable isotope data underline environmental changes across the JIK boundary.

The biostratigraphical study based on the distribution of calpionellids and nannofossils allowed us to distinguish nine calpionellid zones with their fifteen subzones, ten nannofossils zones with ten subzones and on the base of the cyst distribution nine cyst zones and seven ecological event zones.

The high-resolution quantitative analysis of calpionellids, dinoflagellates and calcareous nannofossil assemblages indicates major variations in relative abundance of species, species variability and assemblage diversity and also in the structural composition of their tests. The mass abundance of these microfossils was closely connected predominantly with shallow intrashelf basins and its elevated ridges. These environments were characterized by the permanent current regime positively influencing the nutrient input. The high nutrient potential activated the explosion waves in evolution of specific planktonic association and also selected forms. Such relatively dense environment invoked the feedback pressure on the planktonic organisms. It seems that small usually less calcite calpionellid forms coincided with the environments rich in nutrients and they occured with higher fertility-related nannofossils. Intervals in which small hyaline calpionellid forms were dominated coincided with the abundance radiations of nannoconids. On the other hand, the big elongated calpionelid forms with composed collars (created usually diversified associations) were bind directly with the food specialization. Diversified calpionelid associations are linked with blooms of k-selected highly calcified coccoliths/nannoliths. It is worth of mentioned, that the abundance and size of calpionellid loricas decrease also towards to open marine environments. Salinity variations should have been responsible for thinning of calpionellid loricas and together with the increased evolutionary rates in competetive planktonic communities (foraminiferas, calcareous nannoplankton, radiolarians) could led to total calpionellid decimation.

The ecological calcdinocyst events caused by the blooming of one single species characterized by composed oblique wall structure combined with nannofossil indicators of warm water condition could be a proxy of increasing sea surface temperature. Cooling trends is correlable with onset of tabulated cyst species.

Acknowledgment: The contribution was suppated by Slovakian grant agency: APVV 51-01 1305, APVV-0465-06, and VEGA 1/4039/07. cP 506 - Hammarnet (Tu isie). March. 28-31, 2

CALPIONELLID ASSOCIATIONS FROM THE TrrHONlAN -BERRIASIAN OF THE "TUNISIAN TROUGH" (NORTHERN TUNISIA)

'~epartmentof Geology, Faculty of Bizerte Sciences, Bizerte, Tunisia --. E-mails: --. . .

Upper Jurassic and lowermost Cretacous formations from the "Tunisian Troughu (Northern Tunisia) include the recently revised Beni kleb Fm. Preliminary stratigraphic calpionellid biozonation concerned the Upper part from two sections of the area (J. Amar and J. Jedidi).

In this work, the analysis is extended to the other exposures of the "Tunisian Trough" (J. Chaabane and J. Tamrhoura). A synthesis based on the available data traces the calpionellid succession in Northern Tunisia and the main bioevents parallelized to the usual quantitative study of the assemblages.

The recognized associations and the corresponding biozonation scale fit the reference works used in the other western Tethys areas. The appearence of Lorenziella-like forms within the Lower Berriasian, around the limit between the ammonite Jacobi and Grandis subzones can be used to define an alternative Jurassic-Cretaceous boundary. Higher, within the actual Remaniella subzone, the biozonation is precised: three horizons of Remaniella associations can be distinguished regarding their First Occurence, namely the Colomi, Durandelgai and Catalanoil Ferasini horizons.

Considering the successive associations and the main observed bioevents, a phyletic approach is proposed.

NEW DATA ON CHlTlNOlDELLlD ASSOCIATIONS FROM NORTHERN TUNISIA

'~e~artmentof Geology, Faculty of Bizerte Sciences, .Bizerte, . Tunisia E-mails:houaida m.

Around the Lower-Upper Tithinian Boundary, chitinoidellid successions are first documented from Tunisia, through three bed-by-bed sampled sections. At least four new species can be described and three subspecies are distinguished. On the base of accompaining assemblages, the Dobeni (upper Lower Tithonian) and Boneti (lower Upper Tithonian) subzones of the Chitinoidella zone are recognized. Although the origin of chitinoidella remains enigmatic, new phylogenetic trends at the species level are proposed confirming the status of Chitinoidella as an ancestral stock for hyaline calpionellids appearing around the extreme base of Upper Tithonian. FIFTH 1NTERNATlONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 26-31. 2008

ESTABLISHMENT OF THE BIOCHRONOLOGICAL CANVAS OF THE TOARCIAN WITH THE UNITARY ASSOCIATION METHOD: FORAMINIFERA BIOZONES

SOUUMANE C.', MAROK A.', SEBANE HAMMOUDA S.A.' et HADJl F'.

'~e~artmentof Earth Sciences, Faculty of Sciences,. University Abou Bekr Belkai'd, B.P. 119, Tlamcen, Algeria; e-mail : '~epartmentof Earth Sciences. Faculty of Earth Scknces=enagment of Terrlory, University Es-Senia, B.P. 1524, Oran, Algeria.

The present work has for object the proposition of a biochronological canvas of Toarcian in the South-Tethyan domain (biozones of foraminifera) based on quantitative and determinist analysis method called "Unitary Association" (SAVARY & GUEX, 1999, MAROK & al., 2004).

The biochronological data of the Toarcian foraminifera faunas are analyzed for four well-documented basins situated in the South-Tethyan domain. It concerns the Traras basin (SEBANE, 1997 and AMEUR, 1999) and Djebel Nador of Tiaret (SEBANE, 1984) in Western Algeria on a side and South-Rifan Ridge and the Folded Middle Atlas (BOUTAKIOUT, 1990) in Morocco in the other side.

1. Treatment and optimization data

This study includes 11 sections in all which 12 families, 20 genera and 134 species of foraminifera were listed. They will be analyzed and standardised from a point of taxonomic view to constitute the raw data.

Data for each basin are treated separately by quantitative biochronology method "Unitary Association" (UA). This allowed us to obtain four regional biochronological zonations which then will be treated as sections for the construction of the common zonation of the four basins. Indeed, this method of the UA shows a remarkable concordance with the empirical biochronological scale (HAMMOUDA & SOULIMANE, 2004). Noting that during the treatment, 4 parameters were considered: number of species taken in account, number of biostratigraphic contradictions and strongly connected components (SCC) as well as the number of UA obtained.

2. Results

After successive operation and analysis automatization in the BioGraph program (SAVARY & GUEX, 1999) puts in our disposition three necessary documents: the protoreferential, the matrix of lateral reproducibility, as well as the correlation table of the Unitary Association. At the end of these analysis, the number of families is reduced at 10, the number of genera at 18 and the number of species at 85, distributed on a sequence of 20 UA ordered chronologically during the Toarcian.

3. Interpretation of the results

The whole of last biochronological analysis allowed the construction of the (( Zonal Protoreferential )) composed by a chronologic succession of 20 UA. The -m ,SYMPOSIUM OF IGCP 506 - Hammarnet ITuflis-

sequence so obtained represents the complete synthesis of exclusion and superposition relation of 85 foraminifera species. Otherwise, the following species: Lenticulina obonensis mg. Planularia, Lenticulina bochardi mg. Lenticulina, Nodosaria sp.1, Cyclogyra infraoolithica and Lenticulina pennensis mg. Marginulinopsis are not taken in account in final protoreferential because of probable reworking.

Besides, the 20 UA obtained have been identified in the 4 basins. Their geographical extension has been provided by a matrix of reproducibility. In this optic, a biochronological cutting-out test based on the most reproducible associations having the highest possible unities. This work has made us to define 8 biochronozones for the Toarcian. The said cutting-out is confirmed by the realized correlation table between the different basins.

SEISMIC SEQUENCE STRATIGRAPHY OF THE JURASSIC OF THE CENTRAL ATLAS, TUNISIA

'~Bpartementdes Sciences de la Term, Facult6 des Scieoces de Gafsa. Gafsa 2112. Tunisie f '06partement des Sciences de h Terre, Facult6 des Sciences de Tunis, El Manar 2- '~abwatoirede georessources, CERTE, p61e technologique Bwj Cedria, BP 95.2050 Hammam-Lit. Tunisie

The compilation of outcrop and available subsurface data provided by wells drilled in the Tunisian Atlasic zone has permitted the establishment of a general palaeogeographical reconstruction showing the Jurassic basin and platform distribution. New seismic interpretation also helped in characterizing several seismic sequences within the buried Jurassic series and in setting up several seismic stratigraphic sections, isochron and isopach maps. In the Sidi Kich and Majoura zones, the Jurassic series were subdivided into five second-order sequences (JSI-JSV) bounded by major unconformities that can be followed from one area to another.

The sequences of the uppermost part of the early Jurassic (Toarcian) and those of the middle to late Jurassic interval show important variations in thickness and facies, indicating the development prior to the Toarcian of an irregular and relatively deep shelf, comprising subsiding zones and high platform domains. The gaps and discontinuities, well documented at surface within the North South axis (NOSA) as well as in the Tunisian range further to the north, have been identified also in the subsurface, especially within the highest blocks of the buried Jurassic system of the Atlas. In the subsurface they are expressed by the geometric relationships of the reflectors, which end near the edges and completely disappear on the crests of the blocks. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March, 28-31. 2006

STRATIGRAPHICAL SCHEME OF THE UPPER JURASSIC OF CAUCASUS

Vuks Valery Ja,

A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Sredny pr., 74. 199106 St. Petersburg, Russia; e-mail: YaleN V-

In 1977 stratigraphical schemes of the Jurassic of Caucasus have been discussed at special conference and offered for consideration Interdepartmental Stratigraphic Committee of the USSR which has accepted these schemes in 1981. In the preparation of these schemes took part a lot of geologists from different geological organizations of the USSR. The schemes were published in 1984. The next universal stratigraphical work was a book "Jurassic of Caucasus" which has published in 1992. This book was prepared by International group of geologists from Georgia, Armenia, Azerbaijan and Russia. In this book the renewed version of the Jurassic stratigraphical schemes of all Caucasus has been presented. It was the last version of the Jurassic stratigraphical schemes of all Caucasus which prepared by group of geologists from all Caucasus countries. On boundary XX and XXI century the stratigraphical schemes of the Jurassic of the Russian part of Caucasus were proposed by geologists from the local geological survey from the North Caucasus. These schemes were prepared for the geological mapping of the scales 1:l 000 000 and 1 :200 000 of the Russian part of Caucasus, but they were not published.

Now in the limits of the International project on geology of Caucasus the new version of the stratigraphical schemes of the Jurassic of Caucasus will be prepared by geologists from the Caucasus countries. In this report a personal version of stratigraphical scheme of the Upper Jurassic of the Russian part of Caucasus is discussed. The considered territory consists of thirteen paleotectonical zones which included in three large structures. At drawing up of the zoning scheme of the Russian part of Caucasus the most detailed division into districts from each above mentioned scheme has been usually used. Thus, the new division into districts offered for this scheme is synthesis of data from mentioned schemes. Each paleotectonical zone has typical number of formations. The part of the paleotectonical zones extend to the territory of the Georgia and Azerbaijan, where are different numbers of formations. Therefore there are some problems of correlation of the Upper Jurassic in a frontier zone between countries. In the considered stratigraphical scheme of the Upper Jurassic of the Russian part of Caucasus there are twenty eight formations and groups. Sometimes authors propose to change the stratigraphical intervals of formations in new papers, but if these proposals have not enough data, they were rejected. The part of formations, which was proposed some geologists last time, was not used, because the descriptions of these formations were not published or were published without key data. According to rules of "Stratigraphic code of Russia" there is not possibility to use the formation in the official work, which was published without key data. In the Upper Jurassic of Caucasus there are a lot of fauna groups, but only two - ammonites and foraminifers are used in this scheme for biostraigraphical zonation. There is only one ammonite zonation, and there are two foraminiferal zonations - for Eastern and Western Caucasus accordingly. TQFFTH INT RN T

THE NON-MARINE UPPER TRlASSlC AND LOWER JURASSIC SEQUENCES IN THE SICHUAN BASIN, SW CHINA WITH SPECIAL REFERENCES TO THE TIJ BOUNDARY: A PRELIMINARY ACCOUNT

Yongdong Wangl, Bihong Fd, Xiaoping Xie3, Guodong Zheng', Gang Li', Xiaqu Yangl Yanhong Pan1, Qing Nt and Ning Tianf

' Nanjing Institute of Geology and Paleontdogy, Chinese Academy of Sciences, Nanjing 210008, China; e-mail:

Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; School of Resource and Planning,- Qufu Normal University, Qufu 273165, China; Lanzhou Research Canter for Oil and Gas, Institute of Geology and Geophysics, Chinese Academy of Sciences. Lanzhou 730000. China

The extensive distribution and development of the Early Mesozoic strata make the Sichuan Basin one of the best known areas for the Triassic-Jurassic studies in China. In particular, the Triassic and Jurassic sequences are continuously cropped out in this basin yielding diverse fossil organisms. The Lower and Middle Triassic strata in the basin are of marine origin, consisting of dolomites and limestones with a few gypsum and salt rocks; and are interpreted as a series of arid closed-platform evaporite deposit. The Upper Triassic and Lower Jurassic strata represent the non- marine fluvial and lacustrine deposits bearing coal resources as well as a variety of fossil plants and fauna. The welldeveloped section in Hechuan of southeastern Sichuan Basin is considered as the typical profile for investigating the Upper Triassic and Lower Jurassic sequences as well as the T/J boundary.

The Upper Triassic in the Hechuan section (developed in both banks of the Jialingjiang River) is represented by the Xujiahe (=Hsuchiaho) Formation, which is generally composed of yellowish and white grey fieldspathic sandstones, grey mudstones, pale greenish and dark sandy shales, intercalated by thin coal seams and siderite nodules, and is interpreted as a series of fluvial, lacustrine and peat- coal bearing deposits. The base of the Xujiahe Formation is disconformably contacted with the limestones belong to the Middle Triassic Leikoupo Formation; and is especially distinguished by a thin bed of paleocrust of weathering (residue) composed by yellowish clay bed. Abundant and diverse fossil biotas have been documented in this formation, including plants, spore-pollen, bivalves, conchostracans and ostrocodes, indicating Norian to Rhaetian age of the Xujiahe Formation.

The Lower Jurassic strata in this region are represented by the Zhenzhuchong and Ziliujing Formations in ascending order. The former formation is the base of the Jurassic (ca. corresponding to the Hettangian) and is composed of white quartzose sandstones in the lower part and purple and yellowish green sandy mudstones in the upper part. Limited fossil plants and spore-pollen grains have been recovered from this formation. The Ziliujing Formation may roughly correspond to Sinemurian to Toracian and is composed of shell limestones, purple red mudstone and limestones with sandstone or variegated bed. The fossils are abundant including bivalves, conchastracas, ostrawdes, plants, spores and pollen grains.

The TIJ boundary in between the Upper Triassic Xujiahe Formation and the base of Lower Jurassic Zhenzhuchong Formation shows distinct lithological features. The boundary is distinguished by a scouring surface with fieldspathic sandstones of the Upper Triassic and quartzose sandstones of the Lower Jurassic. Preliminary analysis shows that across the boundary the biodiversity of fossil biota FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2008 may display a pronounced change. It is also significant that different climate and the ecosystem aspects are recorded across this boundary. Further analysis is undertaken focused on the vegetation, sedimentary facies, isotope variation as well as the ecosystem change. These aspects will be considered in the frame work of the non-marine TIJ boundary geological and bio-events and their potential causes. ------This work was suppcrted by the special grant of the Jurassic studies in the Skhuan Basin (No. 07D0020201) as well as the NSFC grant (No. 40472004).

CORRELATION POTENTIAL OF THE FLODlGARRlENSlS HORIZON OF PROPOSED GSSP FOR THE BASE OF KlMMERlDGlAN (STAFFIN BAY, ISLE OF SKYE, SCOTLAND) IN THE LIGHT OF NEW DATA FROM RUSSIAN AND POLISH SECTIONS

Wierzbowski Andrzef, Glowniak ~wa',Kiselev ~mitd,Rogov Michai? and Wright John K.'

Institute of Geology, University of Warsaw, Warszawa, Poland; e-mail: -, Glowniak [email protected] ' Geographical Department, Yaroslad State Pedagogical University, Yaroslad, Russia; e-mail: [email protected] Geologicfl Institute of Russian Academy of Sciences, Moscow, Russia; e-mail: roaov [email protected] Department of Geology, Royal Holloway, Egham, UK; e-mail: [email protected]

On the Isle of Skye in Scotland, the base of the flodigarriensis horizon in the Staffin Bay section is defined by the first appearance of the oldest Subboreal Pictonia species - P. flodigarriensis and its microconch counterpart - Prorasenia. This level shows also the first appearance of the Boreal Amoeboceras (Plasmatites) together with last occurrence of such species as Amoeboceras rosenkrantzi and A. schulginae. The flodigarriensis horizon as established by Matyja et al. (2006) was regarded by these authors as the lowest horizon of the Subboreal Baylei Zone. The horizon shows also a good correlation with the lowest level of the Boreal Bauhini Zone, and thus was proposed as the lowest horizon of the Kimmeridgian Stage. The flodigarriensis horizon, however, has not been recognised so far in other areas of Great Britian due to an important stratigraphic hiatus at the base of the Baylei Zone; as a result, some authors have suggested that the horizon in question has limited correlation potential.

The recent studies of the Unzha River sections on the Russian Platform about 500 km NE from Moscow, and about 3000 km from the Staffin Bay section have revealed a thin, but stratigraphically fairly complete succession of ammonites indicating the presence of nearly all the Boreal and Subboreal standard ammonite zones of the Middle-Upper Oxfordian and lowest Kimmeridgian (Glowniak, Kiselev, Rogov, Wierzbowski, Wright in preparation). The OxfordianlKimmeridgian boundary can be recognised using almost the same faunistic criteria as in the Staffin Bay section: the appearance of the first representatives of Pictonia (but additionally with closely related representatives of Vineta) (M), and Prorasenia (m), as well as of the first Amoeboceras (Plasmatites). This is an assemblage very close to that of the flodigarriensis horizon of the lowest Subboreal Baylei Zone, and the corresponding lowest horizon of the Boreal Bauhini Zone. - In Central Poland (Wielun Upland) newly undertaken studies in the Bimammatum Subzone of the Bimammatum Zone have revealed a very complete ammonite succession representative of this Submediterranean subzone (Wierzbowski, Glowniak, Pietras in preparation). Besides numerous Submediterranean ammonites (especially Oppeliidae such as Taramelliceras costatum, T. pichleri, and others; and rarely even Epipeltoceras bimammatum, Aspidoceras), the section has yielded Boreal and Subboreal ammonites of the genera Vineta(M) - Prorasenia(m), and Amoeboceras (Plasmatites). The latter make possible the correlation of the Bimammatum Subzone of the Submediterranean Succession with lower parts of the Baylei and Bauhini Zones, i.e. with the lowests part of the Kimmeridgian. The data indicate that the flodigarriensis horizon shows in fact quite a large correlation potential, strengthened by contemporaneous changes in both in Subboreal and Boreal fauna1 lineages, which makes it the most useful level for wider correlations at the OxfordianIKimmeridgian boundary. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31, 2008

Session II: SEDIMENTOLOGY AND PALAEOENVIRONEMENTS

FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2004

JURASSIC EVENT SEDIMENTATION IN THE CENTRAL HIGH ATLAS, MAROCCO: AN OVERVIEW

AIT ADDf Abdellah 8 Mohamed ETTA~

'~adiAyyad University, Faculty of Sciences and Techniques, Earth Sciences Department. P.O.Box:549, Gu6liz-Marrakech, Morocco. E-mail:Uddibfsta-marrakech.ac.ma assan an I University, Facult6 Polydisciplinaire-Khouribga, Earth Sciences Department, P.O.Box: 145, Khouribga, Morocco. €.mail: [email protected]

In the Moroccan central High Atlas Mountains, thick sequences of Jurassic rocks, several hundreds of meters thick, are exposed. These marine carbonates were deposited in the short-lived Atlasic basin over continental Triassic and Early Liassic rocks. In the central part of the trough, Lower and Middle Jurassic deposits belong to six formations: Idikel, Aberdouz, Ouchbis, Tagoudite (Liassic formations), and Agoudim, Tazigzaout (Upper Lias-Dogger formations). The Lowest part of the Liassic formations records shallow water environments passing upward into moderately deep water facies. Progressive shoaling led to subsequent the development of coral reefs (upper units of Agoudim and Tazigzaout formations). In some places Middle Jurassic rocks are capped by Lower Cretaceous continental red beds. Event deposits (rapid episodic deposits) are recorded throughout Lower and Middle Jurassic column. These beds range widely in time and depositional setting (from distal turbidites to shelf tempestites). The first and important episodic event corresponds to a turbiditic interval dated of Domerian (upper unit of Ouchbis formation). It exhibits alternations calcirudites, calcarenites and claystones. These turbiditic facies represent mainly basin deposits winnowed by currents from adjacent carbonate platforms. The second episodic event was recorded by a very distinctive unit of the Tagoudite formation (Lower Toarcian); it consists of thin-bedded calcarenite and fine-grained siltstones introduced into the basin by density currents. The next important event deposits consist of lenticular oobioclastic, allodapic, limestones of the Aalenian-Early Bajocian (Agoudim's member II), whose deposition was controlled by tsunamis, tectonic events and gravitational processes enhanced by eustatism. This episodic interval is followed by a very thick sequence of maris and limestone (Bajocian, Agoudim Member Ill) witch are showing episodically some very thin layers of calcarenite. In this interval, the only and interested event level corresponds to thin-bedded calcareous sandstone, interbedded with shaly marls and claystones or thin-bedded nodular to undulose bioclastic limestone. These levels are interpreted as the first manifestation of storm waves and oscillatory currents in the Bajocian deposits. The later episodic interval deposits are recorded by thin-bedded and rippled calcarenite of the Tazigzaout's lower member (Upper Bajocian). The sedimentary structures of these facies indicate that they were deposited from stormenhanced currents in the hemipelagic basin. They reflect episodic, short-lived, high energy conditions which alternate with longer periods of lower energy conditions (mar1 intervals). In the Moroccan High Atlas, all these episodic deposits correspond to periods of tectonic instability and eustatic variations particularly at Upper Domerian, Lower Toarcian and Aalenian-Bajocian intervals. . . FFTH INTFRNATDNAl SYMPOSIUM OF IGCP 506- H-

Early Jurassic (Sinemurian) carbonate platform of Atlas Tunisia (Southern Tethyan margin) and associated peritidal cycles: Sedimentary characteristics, depositional environments and controlling factors

Atef Be1 Kahla ', Mohamed Soussi ' 8 Dan Bosence.

'~acun6des Sciences de Tunis, DBpartement de GBologie, Campus Universitaire. C.P.2092 Tunis, Tunisie. '~epartrnent of Geology, Royal Holloway University of London, Egham. SURREY, W20OEX, UK (Email: atef.bkham

Early Jurassic times are characterized by the development in western Tethys of shallow marine carbonate platforms. At jebel Aziz and Bent Sa'idane well-exposed sections of Sinemurian deposits in the Tunisian range, the have been subdivided into two lithologic units: The first unit (> 135 m thick) is early Sinemurian in age and comprises limestones and dolomites displaying cyclic organisation. The second unit lacks peritidal cycles and is exclusively composed of subtidal limestones dated middle-late Sinemurian. The latter is represented by lithiotid-rich limestones in the Bent Sa'idane area (< 24m) and thick oncoidal floatstones (< 60m) in the Aziz area.

Detailed analysis of the facies and sedimentary structures of the carbonates of the first unit allows us to distinguish more than 50 meter-scale cycles of different types: Type a are shallowing-upward cycles comprising a subtidal intraclastic peloidal grainstone or packstone, with shell debris and algae, passing upward to an intertidal fenestral facies. Type ) are deepening-upward cycles. These start with fenestral dolomicrite, caliche crusts and stromatolite structures, sometimes associated with pisoidal rudstones of supratidal environment grading upward to an intertidal fenestral intraclastic peloidal packstone and then subtidal facies. Type 7 are deepening-shallowing symmetric cycles. These are characterised at the base by an intertidal fenestral facies grading upward to peloidal intraclastic facies rich in algaelcyanobacteria (Thaumatoporellids) capped by intertidal fenestral facies showing vadose gravity cement. Type 6 corresponds to incomplete cycles represented either by subtidal or intertidal facies delimited by two erosional surfaces. The subtidal facies are composed of peloids intraclasts and shells while the intertidal facies have fenestrae.

The comparison of these two sedimentary records shows, for the two sections, a clear general deepening-upward trend during early to mid Sinemurian. This general deepening trend reflects a low frequency sea level rise, punctuated by periodic high frequency relative sea-level fluctuations recorded by the development of cycles.

Cycles in the Bent Saidane section are more regular in thickness and are characterized by thicker intertidal portions and frequent dolomitic supratidal facies with subaereal exposure surfaces indicating periodic emergence of the top of the platform. The subtidal portions of cycles are rare, thin, and characterize only the upper part of the section. In contrast, $e Aziz cycles are characterized by the relative scarcity of supratidal facies. Subtidal facies are by far the more abundant and increase in thickness from base to top.

The Aziz section shows clear evidence for synsedimentary tectonics (faulting, dykes etc.), associated with a thickening-upward trend of the subtidal facies. Furthermore, FFTH INTERNA TIONA1 SYMPOSIUM OF IGCP 506- Hammamet I Tunisia). March. 2&3 l ,2000 maximum flooding intervals are identified near the first occurrence of neptunian dykes. However, in the Bent Saidane section, no syndepositional tectonic activity is recorded. Subtidal facies of this section are more restricted and do not show a maximum flooding zone. These data suggest that the two studied areas belong to two different settings as regards the evolution of accommodation space. The Aziz area, accumulating relatively open marine subtidal facies could be in setting with relatively active subsidence while Bent Saidane, characterized by mostly intertidal facies experience repeated uplift suggested by the occurrence of multiple supratidal facies and exposure surfaces, belongs most likely to a more gently subsiding area. The difference in the expression of cyclicity in the two areas could be explained, at least, by the interference of both eustatic sea level changes and fault-related changes in relative sea-level; with the latter more important in Jebel Aziz than in Bent Saaidan, as attested by the presence of neptunian dykes, synsedimentary faults.

The Sinemurian sedimentary record of the Tunisian Tethyan margin demonstrates the important role of tectonics in the building of cycles and therefore can be retained as a good case study supporting the hypothesis that tectonics may be an important driving mechanism for high frequency cycle generation.

DEFORMED BEDS IN THE MIDDLE TO UPPER JURASSIC LACUSTRINE SEQUENCES IN SUlNlNG REGION, CENTRAL SICHUAN BASIN, CHINA: POSSIBLE EVIDENCE FOR PALEOSEISMIC EVENTS

Bihong F~ *, Yongdong Wan$, Xiaoping Xie ", Guodong Zhengd

* lnstitute of Geology and Geophysics, Chinese Academy. . of Sciences, Beijing 100029, China; 'E-mail: ' ~anjin~lnstitute of Gedcgy and Paleontd~Sciences,Nanjing 210008, China; C Schod of Resource and Planning, Qufu Normal University, Qufu 273165, China; Lanzhou Research Center for Oil and Gas, Institute of Gedogy and Geophysics, Chinese Academy of Sciences, Lanzhou 730000. China

Deformed beds in lacustrine sedimentary sequences are an intriguing and still poorly understood class of sedimentary rocks. They require much careful observation in the field before one is able to fully understand and correctly interpret them. Several deformed beds between undeformed horizontal beds are observed in the Middle Jurassic Shaximiao and the Upper Jurassic Penglaizhen Formations in the Suining region, central Sichuan Basin, China and have been described firstly by this study. Both of the Shaximiao and Penglaizhen Formations in central Sichuan Basin, are non-marine origin, mainly consist of reddish coloured lacustrine deposits interbedded with thin greenish beds, displaying as nearly horizontal occurrence. We study these deformed horizontal beds probably associated with strong ground motion due to large earthquakes in continental lacustrine environments during the Middle to Late Jurassic period based on the detailed field observation and interpretation. These include locally common features, such as slide-slump turbidite, slump-folded turbidite, and convolute bedding, as well as re-deposited breccias, each of them with a thickness of 50-120 cm. Several field outcrops appearing in the Jurassic Petrified Wood Geological Park of Shehong County, Suining region recorded deformed beds interpreted to represent major earthquakes or seismic-induced flood in the Late Jurassic time. Petrified woods and dinosaur skeleton bearing unit with a thickness of 80-120 cm, widely distributed in the Upper Jurassic Penglaizhen Formation, is a distinctive event bed. Field studies show that it contains large slumpdisrupted and slide- stacked features and likely resulted from earthquake-triggered slumps. By analogy with the typical deposits induced by ancient earthquakes, such beds are inferred to result from the breaching and rapid draining of a natural dam generated by an earthquake-triggered landslide. Deformed beds in the Upper Jurassic lacustrine sedimentary rocks interpreted as being induced by earthquakes (seismites) have been reported by some authors (e.g., Wu and Yin, 1992; Yin and Tang, 1993) in Emeishan region, southwest margin of Sichuan Basin. However, these seismites, appearing as water-escape burst-through structures in southwest margin of Sichuan Basin, have very small scale (3-10 cm in thickness) might caused by paleoseismic events of magnitude c5 or 6 in deep water condition. Because small to medium-scale seismic events sometimes can cause deformation in soft sediments, creating water escape structures, sedimentary breccias, recumbent folds, sand blows, ball and pillows, and convolute bedding in late Quaternary or modern lake deposits. These syndepositional and early postdepositional, seismically-induced deformed features are known as "primary seismites." Many of the same features diagnostic of primary seismites are, however, also produced by "soft sediment*' deformation which is caused by slumping or loading of unlithified sediments induced by flood or landslide. Clearly, sedimentary deformation structures described from the Shaximiao and Penglaizhen Formations in central Sichuan Basin is not uniquely indicative of seismogenic origin. Presently, basic characterization and viable stratigraphic models for interpretation of seismogenic structures in ancient continental lacustrine sedimentary rocks, are largely lacking in Sichuan Basin, but it is significant that studies of deformed units like the Shaximiao and Penglaizhen Formations will not only provide evidence for convincing mechanism of seismite generation, but also understanding paleo-climatic and paleo-ecological conditions of the Sichuan Basin during the Middle to Late Jurassic age.

Aknowledgemenf: This work was supported by a special grant of the Jurassk studies in the Sichuan Bash.

JURASSIC SEDIMENTARY EVOLUTION OF SLOVENIAN BASIN ; EASTERMOST SOUTHERN ALPS

University of Ljubqana, Faculty of Natural Sciences and Engine~ing,Department of gedogy, Prim 11, 1M)O Ljubljana, Slovenia. E-mails: tel: 00386 31 508 295

The Slovenian Basin is a Mesozoic deeper-water paleogeographic domain now extending throughout the central Slovenia in approximately E-W direction. The best exposed basinal successions outcrop in foothills of Julian Alps (NW Slovenia). Here they are known also as the Tolmin Basin and structurally belong to the Tolmin Nappe, which together wth the overlying Julian Nappe forms the easternmost Southern Alps. In the Jurassic western Slovenia belonged to the southern Tethyan passive continental margin. It was divided into three paleogeographic domains; the Dinaric Carbonate Platform on the south, the intermediate Slovenian Basin and the Julian Carbonate Platform on the north. In the Lower Jurassic the Julian Carbonate FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008

Platform drowned and become pelagic plateau known as the Julian High. Present study describes overall stratigraphy of the Tolmin Basin and elucidates its main phases in sedimentary evolution. Base of basinal Jurassic successions is mainly the NorianIRhaetian BaCa Dolomite formation, a bedded dolomite with chert nodules. In the HettangianIPliensbachian period Tolmin Basin is characterized by the Krikov Formation composed of hemipelagic and resedimented limestones, mostly turbidites. In the southern part of the basin the formation consists of hemipelagic limestone and interbeds of distal turbidites, in the middle part turbidites prevail, but hemipelagic limestone is still common, while in the northern part turbidites are dominant. In the lower to middle Toarcian the mar1 dominated Perbla Formation is deposited allover the basin. Thickness of this formation varies exceedingly. Upwards it passes into the upper Toarcianlearly Tithonian Tolmin Formation, which is composed of siliceous limestone until Bajocian and than by radiolarian chert. In the southern and central part of the basin two intervals of resedimented limestone occur. Lower interval is Bajocian to early Callovian, whereas upper is late Kimmeridgian to early Tithonian in age. Jurassic successions end with the upper TithonianINeocomian pelagic Biancone limestone. Study of Jurassic Tolmin Basin successions and correlation with other basins of the Mediterranean Tethys brings following conclusions: A) Hettangian to Pliensbachian period was characterized by hemipelagic and gravity-flow carbonate deposits. Distribution of facies associations indicates that the north-lying Julian Carbonate Platform was source area of resedimented limestones. B) At the end of Pliensbachian input of gravity flows in the Tolmin Basin ceased due to extensional tectonic phase that terminated shallow-water sedimentation on the Julian Carbonate platform. The same tectonic phase caused differential subsidence of the basin as evidenced by thickness variation of the overlying Perbla Formation. C) Toarcian, Middle and Upper Jurassic period is characterized by background sediments reflecting following regional changes (1) early to middle Toarcian high terrigenous input and its late Toarcian cessation reflected in (2) progressive replacement of marls by calcareous deposits, (3) Bajocian shift to more siliceous and (4) middle Tithonian reverse shift to calcareous sediments. D) Contrary to the Lower Jurassic the source area of the Middle and Upper Jurassic resediments was the Dinaric Carbonate Platform. Lower interval originated during middle Jurassic high ooide production, whereas upper succeeds late Jurassic demise of reefs and reestablishment of more open-marine platform margin.

TRACE FOSSIL ASSEMBLAGES FROM LOWER TOARCIAN-LOWER BAJOCIAN SlLlClCLASTlC MARINE PLATFORM-NEUQUEN BASIN, ARGENTINA

Bressan, Graciela and Palma, Ricardo Mr2

' Departamento de Ciencias Geol6gicas- Facultad de Ciencias Exactas y Naturales-UBA. Ciudad Universitaria- Pab. 11 (1428) Buenos Aires, Argentina. Consejo Nacional de lnvestigaciones Cientificas y Tknicas (CONICET), Argentina @[email protected], [email protected]

The Bardas Blancas Formation is a siliciclastic platform developed in northern Neuquen Basin (34-41°S, 70°30'W) during the Lower Toarcian to Lower Bajocian. F T INT

The most abundant facies in these deposits are hummocky cross-stratified, laminated and massive fine and medium-grained sandstones, as well as laminated and massive mudstones and siltstones. Less abundant are massive or graded fine and medium-grained conglomerates. This facies association indicates an environment between the lower foreshore and the transition-offshore zone, where the storm processes have dominated. The sandy facies comprise a high diversity association of trace fossils, with elements from Cruziana and Skolithos ichnofacies. The former are characterized by the ichnogenus Chondrites (fodinichnia), Thalassinoides (fodinichnia), Palaeophycus (domichnia), Planolites (fodinichnia), Gyrochorte (repichnia), Taenidium (fodinichnia), Gordia (pascichnia), Lockeia (cubichnia) and Rhizocorallium (fodinichnia). At ichnospecific level have been found Chondrites intricatus, Palaeophycus tubularis, Palaeophycus striatus, Planolites beverleyensis and Taenidium serpentinum. The Skolithos ichnofacies is characterized by the ichnogenus Skolithos, Ophiomorpha, Arenicolites and Diplocraterion, including the ichnospecies Skolithos verticalis. In mudstones and siltstones have been found isolated Chondrites and Thalassinoides. lchnofabric indexes calculated for Skolithos and Thalassinoides are 1-2 (1 : without bioturbation; 2: discrete, isolated trace fossils, with less of 10% of the original bedding disturbed). This can be attributed to an underestimation of the abundance of trace fossils or to a low biologic productivity. During the storms the erosion erased evidences of biogenic activity in bed surfaces (lower foreshore-upper shoreface). Besides, the amalgamation is high in some sections (lower shoreface), making impossible to appreciate the surface of the sandstone beds and the presence of horizontal traces. The distribution of the fauna in patches is another factor that conduces to the underestimation of traces. A low activity could be due to high energy levels in shallow depth waters and low oxygen levels in deep waters. The order of colonization can be determine through the presence of some elements from the Skolithos icnofacies next to element from the Cruziana ichnofacies, indicating evolution of the faunistic association from opportunistic communities to climax communities, suggesting a reduction in the energy of the environment and the stabilization of the environmental conditions. The tiering is showed through the presence of a mixed zone with superficial feeding structures like Taenidium and Gordia and a transition layer with deep Chondrites and Skolithos. The presence of Chondrites in the same level with superficial trace fossils like Palaeophycus, Planolites, and Gyrochorte emplaced in a previous stage, and composite ichnotaxa, where Chondrites appears burrowing abandoned Thalassinoides and Palaeophycus, shows the sedimentary accretion characteristic of environments with high sedimentary rates. The ichnodiversity, the fauna1 succession and the tiering are typical of siliciclastic platforms storm dominated, in an environment where the distribution of the fauna is controlled by energy and oxygen levels. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008

ORGANIC-RICH FACIES IN THE LOWER JURASSIC SERIES OF THE LUSlTANlAN BASIN (PORTUGAL). STRATIGRAPHIC DEFINITION AND TOTAL ORGANIC CARBON

DUARTE L. V. l, L. C. V. OUVEIRA~,F. sILVA', M. J. COMAS-RENGIF03, R. RODRIGUES' 8 R. SILVA~

3000- 1 Departamento de Ciencias da Terra, IMAR - CIC , Faculdade de. Ciencias. e Tecnologia da Universidadede Coimbra, 272 Coimbra, Portugal; Iduarteldct.uc.ot. 2 PETROBRASIRHIUP, G.Canabarro, 500,9' andar, 20271-900,Rio de Janeiro, RJ, Brazil; Icveiaa~~etrobras.com.& 3 Departamento de Paleontologia, Facultad de Ciencias Geol6gicas, Universidad Complutense de Madrid, 28040 Madrid, Spain; ~@aeo,ucm.e~ 4 Universidadedo Estado do Rio de Janeiro, Faculdade de Geologia, 20554900 Rio de Janeiro, Brazil; [email protected]

The uppermost Sinemurian to the Toarcian series of the Lusitanian Basin (Portugal) are composed by marly limestone sediments, rich in benthic and nektonic macrofauna. This sedimentary record includes several intervals of organic-carbon- rich facies, particularly well developed in western sectors of the basin. Generally, these sediments correspond to grey and dark marls showing, sometimes, a strong lamination (black-shale type). In the Lusitanian Basin, these Lower Jurassic organic facies are recognized as one of the most important potential oil source rock.

Based on high-resolution stratigraphy and sedimentology of several sections, this study shows the vertical and lateral distribution of these organic-facies in the whole Lower Jurassic of the Lusitanian Basin. In addition, total organic carbon (TOC) analyzed in more than 550 samples, allow for important conclusions in terms of the depositional system, sequence stratigraphy and palaeogeography. The results presented in this study show that the two most important organic-rich intervals are located in the Oxynotum (?) - Raricostatum zones (Polvoeira Member of Agua de Madeiros Formation) and in the Davoei - upper part of Margaritatus zone interval (top of Vale das Fontes Formation), showing in distal (western) sectors of the basin up to 22% and 15% of TOC, respectively. These values decrease progressively towards the most proximal sectors, with the last organic-rich interval most expressive at the basin-scale. This lateral distribution of TOC, the vertical facies variation and the observed decrease of benthic macrofauna associated to these facies, confirm these stratigraphic intervals as related to second-order maximum flooding phases.

Besides this general evolution of TOC, other organic-rich intervals are, locally, recorded in the Jamesoni, Ibex and Levisoni (middle part) zones, reaching 8%, 9% and 2%, respectively. In spite of this last occurrence, no evidence of black shales is found in the basin around the Polymorphum/Levisoni zones boundary, associated to the Early Toarcian oceanic anoxic event.

Aknowledgement: This work has been supported by the Projects CGL200501765lBTE and POCTIICTN44907/2002. FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008

THE MID-JURASSIC MARINE TRANSGRESSION IN EAST AFRICA: THE BlHEN LIMESTONE (CALLOVIAN - (3)EARLY OXFORDIAN), NORTHERN SOMALIA Fauudi Milvio '

'~ip.Scienze dellaTerra, bia La Pira 4, 50121 Firenze, Italy. E-mail: -a.unifi.t

The Tethyan sea encroached the Arabo-Nubian Shield during Early Jurassic and Middle Jurassic times. In East Africa, marine sediments of early Torcian age are present only in correspondence of narrow and elongated sea arms, i.e. along the Indian Ocean coasts of Somalia and in the Mandera-Lugh Basin (SW Somalia and NE Kenya), the Ahl Mado Basin (N. Somalia) and possibly the Blue Nile Basin (Central Ethiopia). During late Bathonian-early Callovian the sea spread from the previous sea arms to the craton interior, i.e. towards the central and northern Ethiopia, northern Somalia and Danakil area. Generally, the marine transgression occurred over continental siliciclastic units: the calcareous-marly marine sediments deposited on very gentle sloped homoclimal ramps.

The Bihen Limestone crops out in the Bihendula area, North-western Somalia; it conformably overlies the continental quartzose Adigrat Sandstone and it is conformably overlain, through a very sharp flooding surface, by the basinal Gahodleh Shale. In the studied section, the formation is 87 m thick and it can be divided in three stratigraphic intervals. The lower interval (0-22 m) mainly consists of dm- and m-thick bioclastic calcareous-marly levels, alternating with thinly bedded limestones, often with Thalassinoides-type bioturbations; pelecypods and brachiopods are abundant in some marly beds. Tempestitic beds, made up of graded coquinas (bioclastic floatstone to grainstone) also occur. The middle-upper interval (22-68 m) is constituted mostly by dm- to m-thick beds of bioclastic wackestone to packstone alternating with thinner marly beds; tempestitic beds and marly levels are more abundant between 50 m and 60 m, where a 3 m thick, fossiliferous marly bed with nautiloids is present. The upper interval (60-87 m) consists in the lower part of well bedded wackestone and packstone, sometimes nodular and bioturbated, with some more marly levels rich in pelecypods and brachiopods. In the upper part m-thick beds of bioclastic packstones and grainstone with Hydrozoa are present; the uppermost beds consist of bioclastic wackestone and packstone. The harder beds originate sharp morphological steps.

In the lower part there is a fossil association with Homomya inornata (Sowerby), Daghanirhynchia subversabilis (Weir), Pholadomya somaliensis Cox and Homomya inornata Sowerby, whereas in the upper part Somalirhynchia africana Weir, Thracia veliacensis d'orbigny, Pholadomya somaliensis Cox and Paracenoceras hexagonum (Sowerby) are in association with Kurnubia palastiniensis Henson, Kurnubia wellingsi Henson, Nautiloculina oolithica Mohler and aff. Cladocoropsis. The age of the Bihen Limestone is ?Late Bathonian-Late Callovianl?Early Oxfordian.

Several environmental variations can be evidenced within this unit. The environment of the lower interval can be referred to a mid-outer ramp; the features of the middle-upper interval indicates at first a series of variation of bathimetry, probably all framed within the mid ramp, followed by a deepening, marked by the occurrence of the thick marly bed with nautiloids, that represents the level of maximum flooding. Upwards, the environment presents a shallowing-up evolution, FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2006 as it returns to a mid ramp and, in the upper interval, from a mid-inner ramp with low turbolence it passes upwards to an inner ramp with high turbolence.

STORM GENERATED CALCAREOUS TEMPESTITES IN PELAGIC FACIES (UPPER TOARCIAN-AALENIAN, BOU GARNINE HAMMAM LIF, NORTHERN TUNISIA)

Haddad Sofiane Mohamed Soussi and Mabrouk Boughdiri

'D~partementde GBologie, facult6 des sciences de Tunis, Universit6 El Manar Tunis '~Bpartementde Gbologie, facult6 des sciences de Bizerte, Universit6 7 Novembre ?iCarthage Two major geodynamic events have been evoked to explain facies and thickness variation that characterize the Middle Jurassic deposits of the Tunisian Atlas. The first event occurred in Upper Sinemurian-Carixian leading to the fragmentation of the liassic platform. The second event started during Upper Toarcian-Bajocian and reached its paroxysm during Bathonien time of the formation of turbiditic sequence (Turki, 1981; Cossey et Elrich, 1985 ). Sedimentoloigical investigations carried out in Jebel Bou Garnine of Hamma Lif led us to recognize for the first time several intervals made of calcareous tempestites and breccias alternating with pelagic facies. These facies can be ranged with the Upper Toarcien to Bajocian Kef el Orma Formation. This new discovery confirms the hypothesis of the occurrence of important tectonic activity between Lias and Dogger. The later are at the origin of the sedimentological and stratigraphic disturb observed at the Lias-Dogger transition in the Tunisian range and North-South axis. The detailed sedimentological study allows to characterize two different brecciated bodies: The first brecciated body (Bl) corresponds to clast-supporfted breccia with a relatively large amount of matrix. Both lateral and vertical transitions from well- bedded lime mudstone demonstrate that these levels result from in-situ brecciation by partial heterogeneous liquefaction of previously deposited lime mudstone. During storms, the sea ground was strongly deformed by the mechanical effect of storm waves, and carbonate sand was transported and deposited by the hydrodynamic effect of wave-induced current. As consequence, we can see the second type of breccia generated with high hydrodynamic and mechanical wave energy. The second brecciated body (B2) organized as: Breccia/calcarenite/calcisiltite. The breccia level with calcarenite matrix presents pseudo-graded sequence and clasts without preferred orientation. The grain fraction of the calcarenitic and calcisiltitic levels consists of well sorted, calcareous packstone texture, sand and silt. Most grains are "filaments" and echinoderm fragments. In this level we can observe internal structure with hummocky cross-stratification or parallel laminations. The presence of these tempestites interbeded with pelagic sediments, strongly suggest that sedimentation occurred near the storm wave base during relative sea-level falls and tectonic activity. FFTH INTERNATONAL SYMPOSIUM OF IGCP 506- Hammamet ITunisiaJ. March. 28-31. 2048

SHALLOW-BURIAL DlAGENETlC REALM OF UPPER JURASSIC CARBONATE RAMP: LA MANGA FORMATION, NEUQUEN BASIN, ARGENTINA

Ricardo M. ~alma"~and Diego A. ~ietzmann"~

Departamento de Ciencias Geol6gicas-Facultad de Ciencias Exactas y Naturales-UBA. Ciudad Universitaria- Pab. II (1428) Buenos Aires, Argentina. COnsejo Nacional de lnvestigaciones Cientifias y TBcnicas (CONICET). Argentina. emails: -ieaokietzmann-

The outcrops of La Manga Formation located close to Bardas Blancas area in the south of Mendoza Province allow a reconstruction of the shallow sedimentary environment of an Oxfordian carbonate ramp, developed in the Neuquen Basin in westcentral of Argentina. La Manga Formation is composed of greyish wackestone/packstone (outer ramp), greyish grainstonelpackstone (middle ramp), light grey grainstone and subordinate packstones (shoal), grey and white coralline limestones (inner ramp margin), bioclastic, and peloidal wackestones-packstones from inner ramp. The sedimentary record shows a hierarchical sequence stratigraphic organization, which implies sea-level changes of different frequencies (see Palma et al., this symposium). Several aspects of diagenesis were investigated including micritization, cement types, cathodoluminescence and stable isotopes. The earliest diagenetic process is represented by micritized peripheral areas of bioclasts and an early isopachous to bladed calcite. This cement where found lines skeletal and non skeletal particles. Their fibrous habit and non-luminescent features are interpreted to be of early phreatic marine origin suggesting oxidizing conditions. Other varieties of cements are granular calcite and syntaxial cement. The granular calcite cement that either completely fills the dissolved aragonitic shells of molluscs and interparticles pores suggesting a freshwater phreatic origin. This cement display an early non-zoned dull luminescence, followed by zoned, bright luminescence and late dull luminescence of the cavities fillings. Each zone represents the precipitation of calcite from pore waters with different chemical compositions, from reducing to slightly reducing, and reducing conditions during a shallow burial meteroric-phreatic diagenetic environment. The transition to the shallow- burial diagenetic realm is indicated by a typical non-bright-dull cathodoluminescence sequence. Syntaxial calcite cement on echinoid fragments shows a similar luminescence patterns. Granular calcite cement has a 6180 value that ranges between -2.6% to -6.8% PDB and 6I3cvalues from - 2.50% to -4.12% PDB. These values are consistent with meteoric phreatic diagenesis. Physical compaction processes include deformation and breakage of particles, while chemical compaction includes both pression-solution and microstylolites development. Results strongly indicate that the diagenetic environment changed from marine phreatic through meteoric-phreatic, interrupted by a period of emergence. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-37.2008

THE LlASSlC AND DOGGER DEPOSITS FROM THE MAGHREBIAN ATLAS IN THEIR TETHYIAN CONTEXT

Driss SADKl l, Mohamed SOUSS12,Ayad AKASBI & Brahim IGMOULLAN

'Department of Geology, Faculty of Sciences, B.P. 11201 Zitoune, Meknhs 50000 Morocco. E-mail: driss sadkihvahoo.fr '~epartrnentof Geology, Faculty of Sciences of Tunis; C.P. 2092, Tunis, Tunisia. %epartment of Geology, Faculty of Sciences & Techniques GuBliz, B.P. 618 Marrakech, Morocco.

Located on the present-day South-Mediterranean Margin, the Maghrebian Atlas consists of an E-W intracratonical Chain. Its structuring during Jurassic times is characterized by the individualization of several palaeogeographic domains mainly marked by subsiding basins (e.g. Middle and High Atlases, in Morocco; Saharan Atlas, in Algeria, and Tunisian Trough, in Tunisia) bordered by residual platforms as more resistant blocks (e.g. Moroccan and Oranese Mesetas, in Morocco and Algeria respectively, N-S Axis and Tunisian Dorsale, in Tunisia). The spatio-temporal distribution as well as sedimentary records show that the onset of Liassic-Dogger deposits were controlled by sea level fluctuations and a tectonic activity related to the Tethyan rifting and the Atlantic opening.

In this work, N-S transects through the different palaeogeographical domains attempt to reconstruct the palaeogeographic and the geodynamic contexts of the Liassic-Dogger deposits.

Aknowledgement this work accomplished within the frame of Morocco-Tunisia Project no 02/TM/37

NEPTUNIAN DYKES AS WINDOWS INTO TIME OF SEDIMENTARY BREAKS. EXAMPLES FROM THE MIDDLE AND UPPER JURASSIC OF THE CZORSZTYN PELAGIC CARBONATE PLATFORM (WEST CARPATHIANS)

Schlogl Jan l, Adam ~oma~ov)ich~,Roman ~ubrecht',Charles ang gold' and Marian ~olef

' Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University, Mlynska dolina. Pav. G, SK-842 15 Bratislava, Slovakia; e-mail: I ' ~epartmentof the Geophysical Sciences. UnivemouthEllis Avenue. Chicago, IL 60637 USA; e-mail: asowchbuchicaao.ed~ Centre des Sciences de la Terre. Universit6 Claude Bernard Ly%. 27-43 Bd 11 Novembre, F89 622 Villeurbanne, France 4Geological Institute of Slovak Academy of Sciences, Dubravska 9, P.O. Box 106, SK-840 05 Bratislava, Slovakia; e-mail: v Pelagic carbonate platforms (PCP) are characterized by discontinuous sedimentation with long hiatuses. These discontinuity surfaces are often associated with neptunian dykes that diagonally penetrate the underlying rocks. Dykes provide unique information about sedimentation and ecosystems of time intervals that are otherwise represented by gaps in the Jurassic successions. The Jurassic sedimentation on the Czorsztyn Ridge was characterized by dark shells during the Toarcian - Aalenian, biodetritic crinoidal limestones, biohermal and peribiohermal limestones during the Bajocian, condensed ammonitico rosso facies and bedded non-nodular facies during the Uppermost Bajocian - Lower Tithonian and bioclastic-micritic limestones and ammonite coquinas during the Tjthonian - Berriasian. The main hiatuses encompass a part of the Lower Bajocian, a part of the uppermost Bajocian, Upper Bathonian to Early Oxfordian and late Lower Cretaceous, and may be related with both eustasy andlor tectonics (e.g. Lewandowski et al., 2005, Wierzbowski et al., 1999). The discontinuity surfaces are usually marked by mineralized and encrusted hardgrounds, lag deposits, facies FFTH INTFRNATIONAL SYMPOSIUM OF IGCP 506 - Hammarnet (Tunisia). March. 28-31. 2006 changes, and paleokarstification. Neptunian dykes are especially developed in relation with the Upper Bathonian - Early Oxfordian discontinuity surface. Similarly to Southern Alps and Central Apennines (Clari et al., 1995), the studied dykes were infilled with micritic, sometimes laminated sediments with uncommon macrofauna and common Chondrites-like bioturbation. Differences in colour, microfacies andlor lamination orientation suggest repetitive infiltration of sediment into the fissure system. They contain echinoderms, bivalves, gastropods, brachiopods and ammonites, scarce corals and serpulids, and very rare belemnites. Although limited in extent, detailed palaeontological evaluation of the dyke contents provide new biostratigraphic and palaeogeographic data. The fossil assemblages of the dykes are affected by size-selective preservation due to the sieve effect of the fissure system; ammonite microconchs or small-size specimens prevail, but the preservation is generally good. Macroinvertebrate associations from the dykes in Slovakia and Poland reveal that the faunas were relatively diverse and numerically abundant. Based on ammonites, the dyke infillings were dated as Lowermost Callovian, Lower Callovian Gracilis Zone, Middle Callovian Coronatum Zone and early Middle Oxfordian Plicatilis Zone. The ammonite spectra are dominated by necto-pelagic Phylloceratina and Lytoceratina. In the Oxfordian dykes, Ammonitina are represented mainly by Perisphinctidae, Oppeliidae, Lissoceratidae and Cardioceratidae, and by scarce Pachyceratidae and Aspidoceratidae. Boreal Cardioceras occurs in the early Middle Oxfordian Plicatilis Zone (in dykes), where it is relatively abundant and scarcely also in the Middle Oxfordian Transversarium Zone (Miticardioceras, not in dykes). The Callovian examples are dominated by Perisphinctidae and Hecticoceratinae. Moreover the Lower Callovian dykes yield representatives of Tulitidae and of the sub-Boreal Kosmoceratidae. The repetitive migration events of the sub-Boreal and Boreal ammonites took place between at least lowermost Callovian to Middle Oxfordian, corresponding to the time interval of the maximal overlap between Tethyan and sub-Boreal or Boreal provinces (Cariou et al., 1985). Faunal exchanges between different palaeogeographic provinces are also supported by occurrences of Oxfordian Boreal bivalves.

References Cariou E., Contini D., Dommergues J.-L., Enay R., Geyssant J., Mangold C. & Thieny J. 1985. Biogbgraphie des ammonites et 6volution structural de la T6thys au cours du Jurassique. Bulletin de la SodQ6 gblogique de France, 8e serie, l,5, 679697 Clari P. A, Dela Pierre, F. & Martire L. 1995. Discontinuities in carbonate succesions: identification, interpretation and classification of some Italian examples. Sedimentary Geology, 100, 97-121 Lewandowski M., Krobicki, M., Matyja, B. A. & Wierrbowski, A. 2005. Palaeogeographic evolution of the Pieniny Klippen Basin using stratigraphic and palaeomagnetic data from the Veliky Kamenets section (Carpathians, Ukraine). Palaeogeography, Palaeoclimatology, Palaeoecology, 216, 53-72 Wierzbowski, A, Jaworska, M. & Krobicki, M. 1999. Jurassic (Upper Bajoaan - lowest Oxfordian) arnmonitico rosso fades in the Pieniny Klippen Belt, Carpathians, Poland: its fauna, microfacies and sedimentary environment. Studia Geologica Polonica, 115, 7-74 FlFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia), March. 28-31, 2008

SEDIMENTARY FACIES OF THE UPPER JURASSIC SUINING AND PENGLAIZHEN FORMATIONS IN CENTRAL SICHUAN BASIN, SW CHINA

Xiaoping Xie4*, Yongdong wan$, Bihong Fu", Guodong zhengd

" Scbhool of Resource and Planning, Qufu Normal University, Qufu 273165, China; 'E-mail: 7 Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 21 0008, China; C Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; *Lanzhou Research Center for Oil and Gas, Institute of Geology and Geophysics, Chinese Academy of =ences, Lanzhou 730000, China

The Late Jurassic sequence of the central Sichuan Basin in SW China is composed of the Suining and Penglaizhen Formations, both of them are of terrestrial origin. Understanding their sedimentary features are significant for further exploring the development and evolution of the basin. In this investigation, the sedimentary facies features and sedimentary structures are synthetically analyzed in order to clarify the sedimentary environment and evolution of central Shichuan basin during the Later Jurassic episode.

Our study results shows that the basin was widely covered with a set of lacustrine grayish to reddish and purple-red mudstone or shale interbedded with feldspathic fine-grained sandstone with thin greenish beds to siltstone, and these deposited beds are nearly horizontal occurrence. The sedimentary particles are relatively fine-grained both in the Suining and Penglaizhen Formations, showing that the tectogenesis is relatively stable during the Late Jurassic Epoch. However, in the Late Jurassic of Penglaizhen stage, the basin is characterized by widely- spread varigrained and variegated thick sandstone, mudstone and fine conglomerate of river or alluvial fan subfacies, and there are usually sediments and coarse sedimentary particles of relatively large thickness in the Upper Jurassic, reflecting rapid uplift of the mountains around the basin. According to the study of sedimentary structure and sediments particles and colors of sediments, the central Sichuan basin should have a warm climate during the early stage and hot climate from the beginning of the Penglaizhen stage.

The sedimentary environment of the Suining Formation in early Late Jurassic epoch in this area is mainly considered as permanent lake, marsh and floodplain, however, the sedimentary environment of the Penglaizhen Formation in late Late Jurassic epoch is mainly considered as a floodplain and season lake and intermittent lake.

From Middle Jurassic on, the mountains ranges around the basin were in stable, the sediments transported to the basin were fine-grained, mainly characterized by reddish mud and silt and fine sand, as well as popular in mud crack; in some beds, very thin gypsum layers are occurred. It is therefore implied that during this period, the area of the lake was very large with shallow water level. In some time, the lake maybe dried up, or turned to a strong oxygenous seasonal lake and intermittent lake. During Penglaizhen stage, because of the Yanshan orogeny movement, the Longmenshan in the west and northwest and Qinling belts in the north and northeast was strongly uplift, the sediments transported from the mountainous rivers were mainly coarse deposits. The sedimentary environment during this period was mainly branched out into lake delta system and fluvial and floodplain subfacies, there were seasonal or intermittent lake between the wide rivers and ,abandoned channels, maybe some of the lake were oxbow lake subfacies. The sedimentary environment and facies are analyzed based on the field outcrops and embedding FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammemet (Tunisia). March. 2E31. 2008 petrified wood features. The petrified wood widely distributed in the Upper Penglaizhen Formation, maybe caused by flood events during Penglaizhen stage.

Aknowledgement This work was supported by a special grant of the Jurassic studies in the Sichuan Basin. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008

Session Ill: BIODIVERSITY CHANGES AND PALAEOECOLOGY

FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2008

A PELlMlNARY STUDY OF HETTANGIAN BIVALVES FROM THE TRIASSIC- JURASSIC PASSAGE BEDS IN NORTHERN SPAIN

Ana ~&r~uez-~lia~a',Damborenea Susana and Goy Antonio

' ICBiBE and Departamento de Geologia. Universidad de Valencia. 46100 Burjassot (Valencia, Spain) [email protected] Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, (La Plata, Argentina)

Departamento de Paleontologia, Facultad de Geologla. Unwersldad Complutense de Madrid. 28040 Madrid, Spain aoaovhaeo.ucm.es

The Triassic-Jurassic boundary beds from Asturias have been known for a long time, but have only recently been studied in detail from several points of view (see review in Gomez et al., 2007). The palynological contents of these beds is now very well known (Barron et al., 2006) but the scarce invertebrate fauna is not, in part due to the poor preservation of the material involved, enough studied. Some Hettangian bivalves from these beds were illustrated by Gomez et al. (2005), identified as Parallelodon hettangiensis (Terquem), Cuneigervillia rhombica (Cossmann), Eomiodon menkei (Dunker) and Pteromya tatei (Richardson y Tutcher). This material was found associated to ammonites referred to Caloceras pirondi Reynes and Psiloceras sp.

All Hettangian shell beds examined have very low diversity, and in fact, most of them can be regarded as monotypic (Fabares, Barzana, Colunga and Caravia in Asturias; Salinas de Pisuerga and Barrio San Pedro in Palencia). This in itself is a measure of the low complexity of the community structure, and a biological indication that they may belong to marginal marine environments, with high environmental stress levels. Even the more diverse association, the Pteromya- Cuneigervillia-Eomiodon association of Fabares and Colunga, was probably also salinity controlled, and beds with similar fauna were regarded by some authors as belonging to the brachyhaline regime (18-30%0). Other biological features of these beds include absence of stenohaline higher taxa, such as ammonoids, brachiopods, echinoderms and cnidaria; conservative shell morphology typical of reduced salinity environments; and size selection.

The fauna analyzed here clearly belongs to the same facies and environment as those described by Freneix and Cubaynes (1984) from Aquitaine. Apparently similar Rhaetian-Hettangian beds with Eotrapezium aff. germari Dunker have also been mentioned from the Pont Tiout Formation, Algeria. This fauna is completely different from coeval bivalve associations from other European Hettangian localities, such as those from Bergamo and Lombardy (Allasinaz, 1992).

References Allasinaz, A. 1992. The Late TriassioHettangian bivalves turnover in Lombardy (Southern Alps). Rivista ltaliana di Paleontologia e Stratigrafia, 97 (34): 431-454.

Barron, E., Gbmez, J.J.., Goy, A. y Pieren, A.P. 2006. The Triassic - Jurassic boundary in Asturias (northern Spain): palynological characterisation and facies. Review Paleobotanic Palinnology, 138: 187-208.

Gbrnez, J. J., Goy, A. y Barrbn, E. 2007. Events around the Triassic-Jurassic boundary in northern and eastern Spain: A review. Palaeogeography, Palaeoclirnatology, Palaeoecology, 244: 89- IlO.Gomez, J.J., Goy, A. y

- 67 - FIFTH INTERNATIONAL SYMPOSIUM OF lGCP 506- Hammemet /Tunisia). Merch. 28-31. 2008

Mdrquez-Aliaga, A. 2005. Bioestratigrafia del trhnsito Trihsico-Jurdsico en Asturias: ammonoideos y bivalvos entre Avil6s y Caravia (EspaAa). Geo-Ternas, 8:183-187.

Freneix, S. and Cubaynes, R. 1984. Biofacih A Cuneigervillia - Pteromya et biofacih B Eomiodon dans I'Hettangien du Quercy (Aquitaine orientale). Geobios, 17 (1): 517.

MIDDLE TO UPPER JURASSIC STROMATACTIS MUD-MOUNDS IN THE PlENlNY KLIPPEN BELT (CARPATHIANS) -A CLUE TO THE ORIGIN OF STROMATACTIS

Aubrecht Roman ', J4n Schliigl, Michal Krobick?, Hubert Wienbowskt, Bronislaw Andrzej ~atyja'& Andrzej Wietzbowskr'

' Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University, Mynska dolina - G, SK-842 15 Bratislava. Slovakia bpt. of Stratigraphy and Regional Geology, University of Mining and Metallurgy, Al. Mickiewicza 30, PL-30-059 Krak6w, Poland. lnstitute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warszawa, Poland Institute of Geology, Warsaw University, Al. twirki i Wigury93, PL-02-089 Warszawa, Poland.

Stromatactis mud-mounds are structures still enigmatic, despite of many years of research. Recently, most authors consider stromatactis mud-mounds to be fossil microbial reefs. Particularly enigmatic was the origin of stromatactis structures that appear to be the main megascopic component of the mounds. Stromatactis mud mounds occur since Neoproterozoic time and reach their maximum in Paleozoic, especially in Carboniferous and Devonian. Mesozoic examples are rare. They were reported mostly from Jurassic; later examples are dobtfull. Our research concerns Jurassic stromatactis mud-mounds. To date, stromatactis structures were only reported from the Early Jurassic of the Upper Austroalpine of the Eastern Alps, Early Jurassic of Sicily, Oxfordian mud-mounds of southern Germany, offshore Nova Scotia, Oxfordian of Cracow Upland, Poland and Lower Kimmeridgian of southern Portugal. Recently, Middle- and Upper Jurassic stromatactis mud-mounds were found in the Czorsztyn Unit of the Pieniny Klippen Belt in Slovakia and Transcarpathian Ukraine: Slavnicke Podhorie, Babina, Priborzhavskoe and Velyky Kamenets. Stratigraphic range of the mounds is Bajocian to Callovian. Geometry of the mounds could only be studied at Stepnicka skala, Priborzhavskoe and Veliky Kamenets, where flat mound shapes are revealed. Other outcrops show only fragments of the mounds or their shape is merged with the surrounding rocks. Rocks of the mounds are mostly micritic to micropeloidal mudstones, containing fauna of pelecypods, brachiopods, ammonites and crinoids. All the occurrences are characterized by mass occurrence of stromatactis structures. In some of them (Slavnicke Podhorie, Priborzhavskoe and Veliky Kamenets), the stromatactis cayities occur also in the crinoidal limestones underlying the mud-mounds which is an atypical feature. All sites investigated by us involve considerable portion of sponge spicules in the mound matrix. Other biota is variable; it is represented mostly by benthic biota, e.g. brachiopods, bivalves, sponges, agglutinated foraminifers etc., although FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2008 some planktonic representatives are also present, as shells of Bositra bivalves. Typical is micropeloidal matrix, just like in the Paleozoic representetives of stromatactis mud-mounds. The micropeloidal to clotted structures are usually attributed to be typical for microbialites. The stromatactis cavities are initially filled with inclusions-rich radiaxial fibrous calcite, then locally by internal sediment and, finally, by clear blocky calcite. The most important, previously unrecognized fact was revealed at Slavnicke Podhorie, where the spar filling of stromatactis cavities is weathered out. Most of the upper surfaces of the RFC stromatactis filling represent casts after silicisponges. The shapes of the stromatactis does not correspond to the of sponges anymore as they originated after their collapse. The inner filling of the cavities also do not show any relationship to sponges. The casts on the stromatactis surfaces are therefore the only feature which betrays their sponge origin. This discovery means a breakthrough in the more than a century lasting stromatactis problem.

Acknowledgements: This work is dedicated to deceased Pierre-Andre Bourque who was the first who introduced the sponge-theory about the stromatactis origin but, unfortunately, could not see these results. The research benefited from grants provided by VEGA agency (Grant No. 112027105) and APVV agency (Grant NO.0465-06).

CUTICULAR CHARACTER OF JURASSIC FOSSIL PLANTS AS INDICATORS OF PALAEOENVIRONMENTAL CHANGE IN CHINA

Bainian SUN, XIE Sanping, Yan Defei, Li Xiangchwn and Wen Wenwen

College of Earth and Environment Science, L~N~wUniversity, Lanzhou 730000, China; e-mail: bnsuna Izu.edu. cn

Atmospheric C02 concentration has continuously increased since the industrial revolution due to the massive use of fossil fuels and destruction of forests, which would lead to global climate warming. A better theoretical and practical understanding of the linkage between paleo-CO2 and climate during geological history is important to enhance the sustainable development of modern human society. Therefore, stress on plant physiology under current and future continuous increasing of atmospheric CO2 was investigated with various methods in recent years, and stomata1 method on cuticular character is one of them.

In this paper, we focuse on a systemic analysis of cuticular characters of fossil Ginkgo types using plant physiology and anatomical methods for reconstructing paleoenvironment in north China during the Jurassic. The Ginkgo plant is a relict gymnosperm that has a long geological history ranging from the Triassic to today. The taxon possesses favorable qualifications for palaeoenvironmental reconstruction from its clear phylogenetic evolution. As a relict gymnosperm with evolutionary stasis, Ginkgo is well suited for paleoenvironmental reconstruction.

The Jurassic is one of important coal-forming periods in north China. There are continuous coal-bearing series formed in the Mesozoic at Yaojie and Agan Town in Gansu, China. Two fossil sites, Yaojie and Aganzhen, located in the Lanzhou- Minhe basin of Gansu Province in Northwest China were sampled for the present study. Source strata were deposited during several successive intervals, namely, FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2006 the Aganzhen Formation (early Toarcian, Lower Jurassic) and the Yaojie Formation (late Aalenian and late Bajocian; Middle Jurassic).

We analyzed fossil Ginkgo species from integrated strata in the north of China using plant physiology anatomic data. Previous studies were focused on taxonomic and floral characters of fossil plants. Well-preserved leaf cuticles of a few Ginkgo species and Solenites murrayana reflect the epidermal cell structure and stomatal arrangement. Thus, we were able to count the stomatal density and stomatal index. Using stomatal parameters, a trend for the paleo-CO2 level during the Early Jurassic and Middle Jurassic was obtained, which is consistent with estimates by GEOCARB. The estimates of paleo-CO2 based on the stomatal ratio method during the Early and Middle Jurassic are shown in ranging from 1000 to 1600 ppmv.

Ginkgo fossil has been selected from numerous species by paleobotanists as a suitable indicator for paleoenvironmental reconstruction because of its properties of morphological delay and physiological retardation. It is illustrated that the analysis of stomatal index on fossil leaves of several Ginkgo species and Solenites murrayana may be used to determine the change of CO2 concentrations during Jurassic time. The study of Cuticular character of Ginkgo shows that it is a sensitive indicator for paleo-CO2reconstruction.

This research was supported by the National Basic Research Program of China (No.2006CB701400) and the National Natural Science Foundation of China (No. 4077201 2; 40502005).

STRATICRAPHIC DISTRIBUTION, MORPHOMMETRY AND PHYLOGENY OF UPPER TlTHONlAN CALPIONELLIDS ON THE SOUTH-TETHYAN MARGIN OF NORTH AFRICA (MOROCCOAN PRERIF AND TUNISIAN TROUGH)

BACHNOU Ali ', BOUGHDlRl hfabrouk2 & SALLOUHI Houakla '

'~niversit6Cadi Ayyad, Facult6 des Sciences et Techniques brrakech. Laboratoire de GBosciences et Environnement, B.P. 549. Gu6liz. Marrakech. Maroc.

'~partementdes Sciences de la Terre, Facult6 des Sciences de Bizerte, Jerzwna, 7021 Tunisie. Cmab b&gMirihvahoo.frz

The analysis and quantification of the fossil morphology are of a great interest in palaeontological studies. For calpionellids, systematic studies are mainly based on a descriptive and typological approach of their lorica shape. General characters taken into account for their diagnosis consist of the lorica nature and shape, the collar tracing and deflection, the caudal appendige, etc. Through he upper Tithonian time interval, the lorica shape of calpionellid assemblages can be used to appreciate the morphological proximity between different species. For this work, Its variability is feared by a mathematical modelling based on the Fourrier Analysis ; the collar tracipg being considered as linearly discriminated. This quantification of the lorica shape allows its transcription to a mathematical equation the terms of which are used as descriptive variables that constitute a data source for a Principal Component Analysis. In this case, the factorial plans correspond to morphological spaces wihin which the analysed individuals are distributed and groups of close morphologies can be easily identified. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 200Q

The morphommetrical analysis concerned Tithonian populations from the Prerif domain in Northern Morocco and the Tunisian Trough (N Tunisia) ; each species being represented by its mean morphology. The morphological closeness considering the first occurrence of the studied species allows a phyletic scheme proposal where three major lineages are identified : Chitinoidella dobeni-Ch. boneti- Crassicollaria, Ch. cubensis (Ch. boneto-Praetintinnopsella-Tintinnopsella and Ch. bermudezi-Calpionella alpina-C. elliptica.

This first attempt of quantification of the shape variability in Calpionellid loricas underlies the interest of mathematical modelling as a key for significant results as far as phyletic relationships are concerned. Neverthless, the a classic natural method has to be considered a substantial complementary tool for objective interpretations.

SOME EARLY JURASSIC NONMARINE BIVALVES FROM THE SOUTHERN JUNGGAR BASIN, NW CHINA

Jiang ~ao-~u''~,Sha Jin-gend and Pan an-hong3

'~epartmentof Earth Sciences, Nanjing University, Nanjing 21008, People's Republic of China; email: [email protected] 'state Key Laboratory of Palaeobiology and Stratigraphy (Nanjing lnstitute of Geology and Palaeontology,Academia Sinica, Nanjing 210008, People's Republic of China) Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, People's Republic of China

We systematically describe some Early Jurassic nonmarine bivalve fossils, totally 3 species belonging to 3 genera respectively, from the southern Junggar basin, SW China. They are Waagenoperna mytiloides Zhang, Kija kweichouensis (Grabau), and Ferganoconcha sibirica Chernyshev. Based on the new materials, we clarify the dentition of Ferganoconcha Chernyshev, 1937, and make a review on the change in classifications of Kija Lebedev, 1958. Meanwhile, we briefly review the distribution and development of the Jurassic nonmarine bivalve assemblages in China, and subdivide the Middle Jurassic Lamprotula (Eolamprotula) cremeri - Kja kweichowensis fauna of Gu Zhiwei (1982) into two assemblages, i.e. the Early Jurassic (latest Triassic?) to early Middle Jurassic Kija- Ferganoconcha assemblage and the late Middle Jurassic Lamprotula (Eolamprotula) - Psilunio assemblage. FFTH INTERNATONAL SYMPOSIUM OF IGCP 506- Hammemet (Tunisia). March. 28-31. 2004

EARLY JURASSIC LITHIOTIS-FACIES DEPOSITS IN NORTHERN AFRICA (MARROCO; ASSEMSOUK SECTION)-CASE STUDY

Krobicki Michal ', Driss Sadki2,Jan Gdonkal, Anna Plonkal, Urszula PredkP C% Anna Rusinl

'AGH University of Science & Technology, Department of Geology, Geophysics & Environmental Protection; al. Mckiewicza 30, 30-059 Krak6w; POLAND; email: krobickibaaol.aah.edu.DI 'university of Moulay Ismail; Department of Geology, Faculty of Sciences; BP l1201 Znoune; Meknes; MOROCCO; amail:

The huge, up to 40 cm long, Lithiotis, Cochlearites and Lithioperna bivalves, which dominated within Lithiotis-facies deposits, are most significant representatives of buildup-maker of shallow marinellagoonal bivalve mounds (reefs) in numerous places of Tethyan-Panthalassa margins during Pleinsbachian-Early Toarcian time. One of the best known LithiotislCochlearites-bearing buildups occur in numerous localities in Morocco (Atlas Mts), and Jebel Azourki region is most important to study of this facies. Assemsouk section is located in the northern part of Jebel Azourki (High Atlas Mts). The central and the eastern part of the High Atlas Mts are made up mainly by carbonate-clastic Jurassic rocks. At Assemsouk, full sequence of the Early Jurassic (Pliensbachian to Lower Toarcian), lagoonal-paralic deposits is well exposed. These deposits contain magnificent buildup constructed by bivalves such as: Lithiotis, Cochlearites, Lithioperma or Opisoma. Most of these organisms are in a vertical life position - buried alive in muddy sediment. Sedimentological analysis proved features typical for reef environments with well- developed core of the reef and its surroundings ("reef tallus"). Carbonate bivalve buildup is located in clastic deposits represented by sandstones and mudstones with abundance of fauna and flora. Varity of species in this biostructure and gentle transition between carbonate and clastic sedimentation proves changes in paleoenvironmental regimes during origin of these deposits.

The distribution of Lithiotis-facies bivalves from Western (Spain, Italy) and Middle Europe (Slovenia, Croatia, Albania) trough north Africa (Morocco) and Arabian Peninsula (Oman, Arabian Emirates) up to Timor Island and western margin of both Americas (USA, Peru) indicates world-wide, rapid expansion of such Lithiotis-type bivalves. The Early Jurassic migration routes were connected both with break-up of Pangaea and oceanic circulation, which facilitated high speed of distribution of larva's of such oyster-like bivalves. Early Jurassic migration direction was demonstrated by distribution of these reef-building Early Jurassic bivalves.

The separation of Laurusia and Gondwana, which was initiated by the Triassic break-up of Pangaea, continued during Early-Middle Jurassic time. The Early Triassic continental rifting was magnified at the Triassic/Jurassic boundary and the Atlantic Ocean originated as a consequence of this break-up. In effect, the origin of the narrow sea strait, so-called "Hispanic Corridorn, took place between these two continents and connection of the Panthalassa Ocean (Proto-Pacific) and western (Alpine) Tethys gradually started in Early Jurassic, most probably in Sinemurian-Pliensbachian times. Therefok the widespread distribution of numerous fossil invertebrate groups took place during these times.

Previously - in Triassic - the migration of sea fauna (late Triassic crinoids, mollusks, crustaceans and so on) was going through the vast eastern Tethys branch of the Panthalassa Ocean which is perfectly visible in the distribution of the FIFTH INTERNATIONAL SYMPOSlUM OF IGCP 506- Harnmamet (Tunisia). March. 28-3i. 2008 typical .Alpinen fauna of the western Tethys found in the numerous terranes along the western coasts of South and North America. The fauna did not have a possibility to migrate westward, but it could use the numerous terranes within Panthalassa as ,,stepping-stones" allowing relatively free migration eastward from the Alpine Tethys. Another hypothesis suggests migration of these fauna by means of ocean currents.

It is open question, which migration route has been used by Lithiofis-facies bivalves to their whole world dispersion - trough "Hispanic Corridor" or by Panthalassa Ocean?

Aknowledgment: This work was suppoded financially by AGH grant (1 1. ll. 140.447)

THE UPPER JURASSIC REEFS IN THE MAGHREBIAN ATLAS (MOROCCO, TUNISIA)

Ourribane M. ', E. H. Chellai, D. Zaghbib Turkt, B. 0ujhaine3

'~acultyof Sciences Semlalia, Cadi Ayyad University, Marrakesh, Morocco 2~acultyof Sciences Tunis, Tunisia 3~acultyofSciences, Chouaib Doukkali University, Egadida, Morocco.

In the Upper Jurassic, reefs from the Maghrebian Atlas, inter-and intraskeletal cavities were infilled by microbialites associated with microencrusters: Bacinella irregularis, Tubiphytes obscurus, Lithocodium aggregatum and encrusting forams. Micobialitic activity was the main lithifying agent in the reef framework both in the Tetysian and atlantic buildups of the Maghreb Atlas. They occupied about 20% of the whole biomass volume in the Oxfordian reef, 40% in the Kimmeridgian reef (High Atlas, Morocco) and 25% in the Tithonian bioherm (Tunisia).

OXFORDIAN REEF ARCHITECTURE OF THE LA MANGA FORMATION, NEUQUEN BASIN, MENDOZA PROVINCE, ARGENTINA

Palma Ricardo M. 'V" J&, Ldpez ~bmez~,Ricardo D. Piethe4,Diego A. ~ietzmann"~and Susana Adamonis'

' Departamento de Ciencias Geolbgicas- Facuitad de Ciencias Exactas y Naturales-UBA. Ciudad Universitaria- Pab. 11 (1428) Buenos Aires, Argentina.

Consejo Nacional de lnvestigaciones Cientificas y Tbcnicas (CONICET), Argentina - lnstituto de Geologla Econ6mica

Upper Jurassic reefs are widely developed in many areas of the world, but in Argentina are poorly represented. The stratigraphical and paleontological study of the outcrops of the La Manga Formation (60 m), Argentina, located near Bardas Blancas region, Mendoza province (35's and 6g00) allow the reconstruction of the sedimentary environments of an Oxfordian carbonate ramp, where outer ramp, FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hamrnamet (Tunisid. March. 28-31. 2008 middle ramp, inner ramp (oolitic shoal), inner ramp margin (patch reef) lagoon and paleokarst were differentiated. The reefs consist of in-situ framework of coral boundstones (18m) that was formed at the top of shallowing-upward succession, and back reef facies. Coral reefs were analyzed by defining coral colonies shapes, paleontological content, coral diversity and taphonomy studies. In some studied sections abundant fragments of grypheids, incrustant bryozoans and isolated sponges provided a suitable substrate for coral colonization, however, other sections show an increase in the proportions of ooids, peloidal and coral intraclasts. The core-reef facies is composed of white-gray unstratified low diversity scleractinian corals limestone dominated by robust and thinly branching corals with phaceloid-meandriform growths, and domal coral colonies with cerioid-phocoid growths. The assemblage is characterized by Actinastraea sp. and Australoseris sp. Internal facies organization and different types of coral colonies allow to recognize the develop of varying framework as well as intercolonies areas. The reef fabric is superstratal, which vertical coral growth allows more effective biological and physical processes. On the base of coral growth fabric (domal and branching types) the reef of La Manga Formation is considered as a typical mixstones. The intercolonies areas consist of biomicrites and biomicrorudites contaning abundant coral fragments, parautochthonous grypheids and another bivalves (Ctenostreon sp.) gastropods (Harpagodes sp., Natica sp.), echinoderms (Plegiocidaris sp.) and echinoids spines, milliolids, Cayeuxia sp., Acicularia sp., Salpingoporella sp., and intraclasts, ooids, peloids and coated grains. Due to growth forms, the domal ones forms are probably more protected against biological and physical destruction, meanwhile delicate branching forms with very open and fragile framework were more affected and fragmented due to wave action and bioerosion. The reef fabric shows different intervals of truncation as consequence of erosion resulting from coral destruction by storm waves or currents. The maximum flooding surface separates oolitic shoal facies below from the aggradational and progradational coralline limestones facies above. An episode of sea-level fall and karstification (148 Ma) affected reef and oolitic facies.

VERTEBRATE BURROWS IN THE LOWER JURASSIC CONTINENTAL STEIERDORF FORMATION, ROMANIA

Popa, M. E. ', Kedzior, A. '

'~niversityof Bucharest, Faculty of Geology and Geophysics, Laboratory of Palaeontology, 1, N. Balcescu Ave.. 010041, Bucharest, Romania; e-mail:

'~olishAcademy of Sciences, Senacka l,31-002 Krakow, Poland; e-mail:

The continental Lower Jurassic Steierdorf Formation yields a rich assemblage of plant fossils (macroflora and microflora) and animal traces (footprints, burrows, plant-animal interaction marks) aged Hettangian - Sinemurian. It includes two members, the Doman Member, coarse, conglomeratic, and the Valea Tereziei Member, finer, including sandstone, clays, and coals. The whole sedimentary succession includes braided river, lake, marsh and alluvial fan systems which can be easily documented along major, open cast mines, underground mining horizons and natural outcrops, mainly occurring in Anina and Doman, as two major coal mining localities in the Southern Carpathians. The Steierdorf Formation also records red beds sequences and coal bearing sequences, the red beds sequences occurring to the base of the formation. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 5-amet (Tunisia). March. 28-31. 2008

Vertebrate burrows are represented by two types, a linear, slightly curved, horizontal or oblique type and a spiral, vertical type. The first type is more frequent, simple or with dichotomizing tunnels, with or without additional chambers, while the second type has been recorded only in one case. In both cases, they are dug in paleosoil sequences, and the sediment infillings are different of the usual sandstone matrix, sometimes with oxidizing coating of the galleries.

Such structures are unique in Europe, both in age and in origin, indicating a much more diversified vertebrate fauna than thought before.

JURASSlC SYSTEM OF QINGHAI-XIZANG (TIBET) PLATEAU, CHINA

Sha Jingeng, Huawei Cai, Yanhong Pan, Yaqiong Wang, Xiaolin Zhang andxiaogang Yao

LPS, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China. E-mail: m

Qinghai-Xizang (Tibet) Plateau is the place where the fully marine Jurassic is the most complete in China, and locally, in northern Tanggula Mountains of northern Tibet, exists alternating marine and non-marine section.

On the basis of both the Jurassic index fossils and lithology, the Jurassic subdivision and correlation in the plateau can be framed in Table 1. The index fossils include ammonites, belemites, bivalves including buchiids, brachiopods, foraminifers and radiolarians.

I Ciucuwun Fm JiabulsFm Linbuzong Far, Dumi Fm X,resRnnFm Lnornn Fm .ti E i T~thoaian L XlmnicriJg~sn Wcimci Fm [a&FmJ DU"d'gou Sunvua Fm -!1 Xiaasuokn Fm + Ihfordtdta ,"2":"b",e:$ La&on$trqFm

I l l C'rrllur~sn X~aliFm

U .-* Quasmp Wenquan Em Billho~#an llllllllllllllllll (ineludins SBngkda~oflpFm Uuqu rm D~~~qlu~~

U lnlcng$r Fm (aLurc Fm) Yebm Pm) 'IL'*"* "" 1 Brjncian SeuqaFnr 7' rulun Fm Mienic Ounrocba .4alcn1an Xlongla Fm 11111111111111111 "a'i" Fe Yong~raI m Nadigang~i (ir Tu+rstrrt Z?' 2 Pl~rndxichinn ~rmgduik.m: 3 : km) Ridang Fm hdapu I'm Chela~lggaFn T.. , Siatmurton rt W~tlongFm Ilttrm~ran Gtrn g Fn

Table . Subdivision and correlation of Jurassic in Qinghai-Xizang Plateau, China SINOLEJEUNE YlMAENSlS GEN. ET SP. NOV. (HEPATICAE) FROM THE MIDDLE JURASSIC YlMA FORMATION, HENAN, CHINA

Xiang-Wu WU', Mao-Ju ~ang'and Bo-Le zhang2

I~anjingInstitute of Geology and Palaeontology. Chinese Academy of Sciences, Nanjing 210008; e-mail: wnia~au '~ingdaoResearch lnstitute of Gedechnical Prospecting and Surveying, Qingdao 266071

The new liverwort collected from the Ginkgo yimaensis bed of the Middle Jurassic Yima Formation is preserved with the peichaetium and the perigonium. The gametophyte is dorsivental, irregularly branched, bearing two-ranks of lateral leaves obliquely attached to the main axis, and one rank of ventral leaves transversely attached to the ventral surface of the axis. The lateral branch bearing the perigonium arises from the axil of the ventral leaves. The perigonium consists of small paired perigonial bracts arranged in a spike. Two perichaetia are borne on the top of lateral branches with an ovate perianth bearing longitudinal ridges and grooves. Setae are thin and straight and stretch out from the aristulate perianth mouth. The general morphology of this fossil bears a resemblance to some living liverworts of Lejeunmiaceae (Jungermanniales). This is the only record of a fossil gametophyte with lateral and ventral leaves, and with perichaetium and perigonium in China. It is so far the oldest fossil record of Jungermanniales in the world. FF'fH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31, 2008

Session IV:

ISOTOPE GEOLOGY AND MAGNETOSTRATIGRAPHY

FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31, 2006

INTEGRATED 610- AND MAGNETOSTRATIGRAPHY OF THE TlTHONlAN - BERRlASlAN INTERVAL IN THE TETHYS OCEAN: IMPLICATIONS FOR THE DEFINITION OF THE JURASSICICRETACEOUS BOUNDARY

C.E. ~asellato',E. ~rba',J. E. T.~hannelp and G.Mutton? ...... ' Dep. of Earth Sciences, Univ. of Milan, Milan, Italy - -, giovanni.muttoni1 Dep. of Geological Sciences, University of Florida, Gainesville, USA; e-mail:

The JurassicICretaceous boundary time interval is characterized by a major calcareous nannofossil speciation episode: several successful genera and species first appear and rapidly evolve, particularly nannolith genera show a progressive increase in diversity, abundance and degree of calcification through time (Roth, 1989; Bralower et al., 1989; Erba & Quadrio, 1989; Bornemann et al., 2003; Bown et al., 2004; Tremolada et al., 2006; Casellato & Erba, 2007). In the Tethys ocean this event is associated with a major change in pelagic sedimentation from predominantly siliceous to mostly calcareous (transition from Rosso ad Aptici IRosso Ammonitico Superiore to Maiolica).

Magneto- and calcareous nannofossil biostratigraphy, and nannofloral relative and absolute abundances have been investigated on selected Tethyan land sections (Monte Pernice, Torre de Busi, Foza, Colma di Vignole, Frisoni - Southern Alps, Italy) in order to integrate calcareous nannofossil events with the polarity chron sequence and, where available, with calpionellid biostratigraphy. Biostratigraphic investigations have been performed directly on un-heated magneto-core end pieces: calcareous nannofossil biostratigraphy, relative and absolute abundances have been performed on simple smear slides and ultra-thin sections (7-8 pm thick), calpionellid biostratigraphy has been investigated on thin sections. All known calcareous nannofossil Zones and Subzones (gralower et al., 1989) have been recognized. Differences in some taxa ranges have been also pointed out, due to the high-resolution sampling (one sample every 5 - 40 cm). Chitinoidella, Crassicollaria and Calpionella Zones have been identified across the Jurassic/Cretaceous boundary (Rernane, 1986; Pop, 1994b; Rehakova & Michalik, 1997). Nine polarity chrons (from CM24 to CM1 7) have been identified.

Quantitative nannofossil studies indicate that nannolith taxa (firstly F.multicolumnatus, then C.mexicana, finally P.beckmannii) increase significantly in abundance, size and degree of calcification gaining lithogenetic proportion. The abundance acmes are reached in discrete steps between calcareous nannofossil Zones NJ-20B and NJK-A, in the interval marked by the first occurrence of calcified calpionellids. Nannoconids also appear and rapidly evolve across the TithonianIBerriasian boundary, reaching lithogenetic abundances from calcareous nannofossil Subzone NJK-C to NK-1. High nannoconid abundances are concomitant with the well known Acme of Calpionella alpina spherical forms, both contributing to most Maiolica micrite. Calibration with magnetostratigraphy indicates that these trends could be very useful as additional bio-horizons in the Tithonian and for locating the JurassiclCretaceous boundary, especially when ammonites are absent, as in the Tethyan Maiolica. In particular, the speciation of highly-calcified nannofossil forms, and the remarkable abundance and size increase, could provide FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2006 new reliable stratigraphic events for the JurassiclCretaceous boundary interval in low latitudinal pelagic and hemipelagic sequences.

MAGNETOSTRATIGRAPHY OF THE JURASSIC/CRETACEOUS BOUNDARY IN THE LOKUT SECTION, TRANSDANUBIAN RANGE, HUNGARY

Grabowski J. ', Haas J. ', MBrton E. 3, Pszczdkowski A. ' . . '~olishGeological Institute, Rakowiecka 4, 00-975 Warszawa. ' ' Department of Gedcgy, E LorAnd Unimly, H-1 117 Budapest. PAmAny-- 3~.LorAnd Geophysical Institute, H-1145 Budapest, Colurnbus U. 17-23. 1 'institute of Geological Sciences. Polish Academy of Sciences, Twarda 51155, 00-818 Warp-

Tithonian and Berriasian in the Transdanubian Range reveals a typical development of swell and basinal facies formed in the Western Tethys (Haas, 2001). Up to the Middle Tithonian, for the most part of the Upper Jurassic, red nodular limestones predominate (PAlih6las Formation). In the Late Tithonian calpionellid limestones of condensed type deposited on the swells (SzentivAnhegy Formation) whereas in basinal setting cherty, calpionellid-radiolarian limestones were formed and more rapid sedimentation took place (Mogyorosdomb Formation). This formation becomes more argillaceous in the Valanginian and Hauterivian. On the swells crinoidal - brachiopod grainstones or condensed ammonite-rich limestones developed. The LokOt section, localized in the central part of the Transdanubian Range was chosen for detailed integrated bio- and magnetostratigraphic studies. Our new results proved that the exposed part of the section (ca. 13 m of thickness) embraces the upper part of the Lower Tithonian (magnetozone CM21 r, P. malmica Subzone) up to the lower part of the Lower Berriasian (magnetozone CMl8r, C. alpina Su bzone). Sedimentation rate of red nodular limestones of the Palihalas Formation (Early Tithonian) was very low, only 1 - 1.4 m1My (magnetozone CM2ln, without compaction correction). In the Late Tithonian and earliest Berriasian (CM20n to CM19n2n magnetozones) the calpionellid limestone sedimented at a higher rate of 3 - 5 mIMy, while in the uppermost part of the section (CM19nlr to CM19n2r, Early Berriasian) ca. 8 mlmy. Very low values of magnetic susceptibility can be explained by a very limited influx of terrigenous material. Thus sedimentation rate was governed mostly by carbonate productivity. Negative susceptibilities of calpionellid limestones in the upper part of the section seem to correlate with higher sedimentation rate. Sedimentary environment was most probably similar to that in the Brodno section (Slovakia, Pieniny Klippen Belt, HouSa et al. 1999). On the contary, the coeval sections from the basinal facies of Fatric units (Tatra Mts, Grabowski & Pszczolkowski 2006), are characterized by both higher susceptibility values and sedimentation rates in the JurassiclCretaceous boundary interval (5- 7mlmy) and in the Early Berriasian (10-17mlmy) due to higher terrigenous influx.

References Grabowski J. i PszatAkowski A. 2006. Magneto- and biostratigraphy of the Tithonian - Berriasian pelagic sediments in the Tatra Mountains (central Western Carpathians, Poland): sedimentary and rock magnetic changes at the JurassicJCretaceous boundary. Cretaceous Research, 27: 398-417

Haas J. 2001 (4.). Geology of Hungary 2000. Eotvos University Press, Budapest. Houia V., Krs M., Krsovii M,, Man O., Pruner P. i Venhodovii D. 1999 - High-rao!ution magnetostratigraphy and micropaleonto1ogy across the JIK boundary strata at Brodno near Zilina, western Slovakia: summary of results. Cretaceous Research, 20: 699-717.

PRINCIPAL RESULTS OF BOREAL-TETHYAN CORRELATION OF THE JURASSIC-CRETACEOUS BOUNDARY BY MAGNETOSTRATIGRAPHY

HouSa V&CI~Yj'. pruneipetr, ViHor Zakham< Martin I(&& yrtin ~hadima: Mikhail ~ogo;,Stanislav ~lecht:, Matfin Matuch

' institute of Geology ASCR v.v.i, Razvojo* 269.165 02 Prague 6, Czech Republic ; email: [email protected] Charles Uniuersity of Prague, Albertov 6, 128 43, Prague 2, Czech Republic Geological Institute of RAS, Pyzhevsky lane 7, 119017 Moscow, Russia

Biostratigraphic methods have been largely unsuccessful in establishing correlations between different temperate realms, Tethyan and Boreal, in the Northern hemisphere for times corresponding to the Jurassic-Cretaceous (JIK) boundary interval. For the purpose of liquidation of this gap authors undertook joint bio- and magnetostratigraphic studies of the J/K boundary beds, situated at the Nordvik peninsula, northern Siberia (GACR 205-07-1365)Jhe principal results are based on high resolution magnetostratigraphic investigations of the J/K boundary strata in both the Tethyan and Boreal Realms, particularly for the sections of Brodno (Western Carpathians, W Slovakia), Bosso Valley (Umbria, Central Italy) and Puerto Escaiio (Province of Cordoba, S Spain). Paleomagnetic HTC (C- components) of NRM were reliably inferred for most of the limestones from Tethyan realm after thermal demagnetization in the range of 440°C to 580°C. This study, in conjuction with F. Cecca, G. Nardi, M. Piscitello, F. Oloriz, J. M. Tavera, detected and precisely defined two narrow reverse subzones ("Kysuca" and "Brodno") inside magnetozones M20n and M19n in all of the Tethyan sections and are well correlated with the M-sequence of marine magnetic anomalies. Key interval for paleomagnetic sampling of the Nordvik section has been determined by using biostratigraphy from top part of Middle Volgian (Epivirgatites variabilis Zone) until lowermost Ryazanian (Hectoroceras kochi Zone). The section consists predominantly of marine black shales with abundant concretions and several diagenetically cemented layers. Progressive alternating field demagnetization, up to the maximum field of 100 mT, was performed for all samples. Two stable components of the NRM were isolated where the high-field component is regarded as the characteristic remanent magnetization (ChRM). Both magnetic polarities are present for the high coercivity ChRM. This section is contain of magnetozones ranging from M20n to M17r and two narrow reverse subzones "Kysuca" in MZOn, and "Brodno" in M19n. Their positions are within normal magnetozones, one inside of lower N-magnetozone and the second in the youngest part of the middle N- magnetozone. Identical to analogy of the Kysuca Subzone detected in normal magnetozone M20n is only 7cm thick. According to the Brodno profile, it is situated above the middle of normal magnetozone M20n. Another reverse subzone called the Brodno Subzone, detected in the upper part of normal magnetozone M19n, is 17cm thick. Magnetostratigraphic data obtained by us from Boreal section were compared with the analogous materials from the J/K boundary beds of the Tethyan character. The research showed that the Boreal JIK boundary is much younger FFTH INTERNATKINAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 2531. 2QQ4 than the Tethyan - both boundaries lay in different magnetozones. The Boreal and the Tethyan JurassidCretaceous boundary strata were successfully correlated for the first time using high resolution magnetostratigraphic investigations.

C- ISOTOPE STRATIGRAPHY OF THE TIJ AND JIK BOUNDARY "KEY PROFILES" OF THE WESTERN CARPATHIANS AND THE CORRELATION WITH OTHER STRATIGRAPHIC PROXIES

Lintnerd o'., Michalik y.,RehAkov4 D'., HaUsov& E'., Bird A'

'~omeniusUniversity, Faculty of Sciences, MynskA dolina, 84215 Bratislam, Slovaki, e-mail: ' 'Skwak Academy of Science, Geological Institute, Mbravskd 9, Box 106, 84105 Bratislaw- -bironhsavbb.sk

During Rhaetian-Lower Jurassic times, the Central Western Carpathian part of the northern Tethyan shelf was locally emerged or~rnfluencedby terrestrial input from its hinterland. Uppermost Rhaetian limestones of the Fatra Formation are overlain by the ,Boundary Clayand the .Cardinia SandstoneUof the Hettangian Kopienec Formation. Based on microfacies analyses and on striking 6l3cCa~ negative excursion the boundary interval was placed near to the lithological boundary (Michalik et al., 2007). The TIJ boundary position was precised by two negative 613~0,excursions located above it.. Moreover, its location corresponds with variations in the sedimentary organic matter, with carbonate content, as well as with changes in clay mineralogy and palynology data pointing to a change from dry into more humid climate regime. Therefore, the C-isotope signature contributes to more precised regional and global correlation.

Continuous Jurassic - Cretaceous pelagic limestone sequence of the Brodno section offers the best possibility to document the J/K passage in a wide area of the Western Carpathians. The section comprises a good calpionellid, nannofossil, and paleomagnetic stratigraphic record. The bulk carbonate stable isotope (6 180,6 13c) data gave good results comparable with the global C isotope trend of paleotemperature changes during the JIK boundary. The interpretation of the isotope data was supported by sequence stratigraphy and micro and nannoplankton analyses. Especially the diversity and abundance of nanoplankton were useful in precising the O-isotope data in paleotemperature conclusions. All these results give a good reason to regard the Brodno section as an important key section within ef the Mediterranean Tethys area. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammarnet (Tunisia). March. 28-31. 2004

THE QUEST FOR REFINED CALIBRATION OF THE JURASSIC TIME SCALE

PBlfy Jozsef

Research Group for Paleontdogy, Hungarian Academy of Sciences-Hungarian Natural History Museum, POB 137, Budapest, H-1431 Hungary; e-mail: palfvhnhmus.hy

The Jurassic time scale assigns numerical ages to boundaries of chronostratigraphic units. A well-established ammonite biochronology forms the basis of stage definitions that are being formalized by Global Stratotype Sections and Points (GSSPs). Two major updates of the Jurassic time scale (referred to as JTS2000 [l]and GTS2004 [2]) were published in the last decade. JTS2000 relies heavily on U-Pb and 40~r139~rdates, whereas GTS2004 emphasizes complementary scaling methods using strontium (Sr) isotope stratigraphy, cyclostratigraphy and magnetostratigraphy. U-Pb and 40~r/39~rdates remain the backbone of the time scale; relevant new developments are briefly reviewed. Sixteen recently published ages are added to the database of calibration points. Floating cyclostratigraphies already cover a significant portion of the Jurassic, allowing measurements of durations that need to be anchored and linked to chronostratigraphy. Where tie-points are sparse, reliance on scaling methods remains necessary. Sr isotope stratigraphy and magnetostratigraphy are increasingly sophisticated and useful for both correlation and scaling. Further refinements of calibration are expected from more accurate and densely spaced radioisotopic age tie-points, especially in the Late Jurassic, and from an extended coverage of Jurassic astrochronology. In the computer era, time scales are increasingly being digitally delivered, continuously updated and interactively accessed by their users.

MAGNETIC PHASES FROM SOME JURASSIC CARBONATES OF NORTH TETHYAN BASINS

ZicWkowski Piotr ', Sidorczuk Magdalena ' and Lewandowski Marek 2r3

'~acultyof Geology, University of Warsaw, Poland; 'e-mail: i W. . I. 2e-mail: [email protected] 21nstitute of Gedogical Sciences, Polish Academy of Scie-?-maiI:[email protected].~I lnstitute of Geophysics, Polish Academy of Sciences. Poland

Particles of magnetic minerals of detrital, biochemical and diagenetic origin play important role in carrying the natural remanent magnetization (NRM) in sedimentary rocks. Recognition of a nature of the magnetic carriers is one of the crucial steps in concluding on the age of NRM. While presence of detrital magnetic grains, as to Ti- hematite or magnetite, is a positive evidence for primary origin of NRM, a presence of an autigenic magnetite points to a secondary nature of NRM component. Standard rock magnetic studies, employing hysteresis parameters analyses, susceptibility measurements or thermomagnetic experiments, may identify magnetic phases, but these methods do not provide information on the origin of the NRM carriers. Scanning electron microscopy methods may effectively enhance the knowledge on geochemical and mineralogical state of the magnetic phases and to contribute to better understanding of their evolution due to diagenetic processes. FIFTH INTERNATIONAL SYMPOSIUM OF lGCP $06- Hammarnet (Tunisia). March. 29-31. 2008

We present results of rock magnetic and electron microscope studies on assemblages of magnetic minerals identified in the Middle and the Upper Jurassic carbonates, collected during paleomagnetic works in the Pieniny Klippen Belt of Poland and Slovakia, as well as in the coeval epicontinental carbonates of the southern Poland. Since detrital Ti-magnetites seemed to be a major component of the magnetic grains assemblies in most cases, we argue for detrital origin of the characteristic NRM components, identified in these rocks. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 2831. 2008

Session V:

TECTONICS AND GEODYNAMICS FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2008 THE MESO-CENOZOIC EVOLUTION OF GUERCIF BASIN RECONSTRUCTED FROM SEISMIC LINES INTERPRETATION

H Attar', A. Chalouan2, M. EL AU?

' Departement of geology, University Mohamed V, Faculy of sciences Rabat Agdal Departement of qeology, University Mohamed V, Faculty of sciences Rabat Agdal ONHYM, 34 Avenue AI Fadila, 10050 - Rabat

The Guercif Basin is a depression of the African margin of Thethys, made of Jurassic grounds filled by a discordantly tertiary series. It is included in the Taza- Oujda corridor and is located in the prolongation towards the North-East of the Middle Atlas and the High Plateaux. Tectonic Phases recognized in the Middle Atlas, also exist in the Guercif basin, because the structures of this last are septentrional prolongations of those of the Middle Atlas. The present study is based on the interpretation recent seismic lines acquired by ONHYM in 2003.This lines show that the structural evolution of this basin was divided into tree major events: Triassic-Jurassic extension which originated in response to the opening of the western Tethys and the North Atlantic Ocean, gives rise to structures in horsts and half graben. Then the basin had undergone into two compressional events: Atlasic and Alpine. The atlasic phase: Started in the Cretaceous (early Miocene) and show folds of direction ranging between N30 and N50 (Atlasic direction). The anticlines are often tight and faulted and the synclinal broad and at flat bottom. The directions attributed to this event are NE-SW and N-S. The alpine phase: Started in the Miocene with two directions NW-SE and E-W .The structures of this system line a succession of concentric arcs with convexity towards the South. The folds are of cased style, regular; the anticlines and the synclines have comparable dimensions.

TECTONIC CONTROL OF THE LOWER JURASSIC DEPOSITS OF TODRHA DADES IN THE SOUTH EDGE OF CENTRAL HIGH ATLAS, MAROCCO

lbouh H.'; Ettaki M,'. and Chellai E. H.2

'~e~artmentof Geology;. Laboratory of geosciences and environment, Fac. Sci. and Technics, B.O. 549, Gueliz, 40 000 Marrakech; i ouhofsta-marrakech.ac.m '~epartmentof Geology, Faculty oPSciences Semlalia, B.O. 2k0.40 000 Marrakech.

The High Atlas of Todrha Dades is geographically situated on the south edge of the central High Atlas of Morocco, between Tinghir and Boumalne cities, at 150 km east of the Ouarzazate city. Geologically, the studied area show sedimentary outcrops, from Sinemurian to Bathonian age, and structured by faults and folds with atlasic trend (N70).

The studie of lithologic cross section (Ettaki, 2003) and synsedimentary tectonic structures, show a geodynamical evolution of the Todrha-Dades Atlas with two paleogeographic domains. A platform domain in the south and a basin domain in the North (fig. l),separated by the Dades-Tamtetoucht fault trending NE-SW to N70 (Ibouh, 2004). The Jurassic sedimentation, in this area, is checked by an extensional tectonic and tensional left hand shear into four successive stages: ,' FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammemet (Tunisia). March. 28-31. 2008

l-Sinemurian-Carixian stage: the platform is structured by NE-SW to N70 faults which limiting narrow blocks. The tectonic style is tensional with NW-SE opening trend. The normal faults trending NE-SW shows collapses towards the NW and the tilting blocks towards the SE. These collapses structured the Todrha valley, during this period, as a platform with juxtaposition of the shallows and hollows, responsible of the frequent lateral facies changes. The analysis of lateral thickness change and the slipping trend of the slumping structures show a paleogeographic slope towards the SW during this stage.

2-Domerian and Lower Toarcian stage: in the basin domain, the analysis of the facies lateral variations according to two different axes; NNW-SSE trend and NE-SW one, shows that the sedimentation was made on an unstable block limited between the lkerzi fault on the North and the Dades-Tamtetoucht Fault in the South (Fig. 1). This block was baptized block of Kit Sedrat (Ibouh, 2004).

- The facies and thicknesses comparison according to the NW-SE axis shows a first tilting of the block southward before the upper Domerian. This movement differentiates two sedimentation areas relatively different with the reef limestone in the North and marly limestone with zoophycus in the South. This tilting is linked to the extensional deformation trending NNW-SSE.

.-The analysis of lateral facies and thicknesses variation, according to a NE- SW axis, shows that the block of Ai't Sedrat presents, at the same time as its slope southward, a slope towards the northeast during Domerian-lower Toarcian. This slope would be probably resulted from the collapses of small blocks limited by NW- SE faults (Fig. l), responsible of the succession of Toarcian fan shaped deposits opened towards northeast at the Aguerd Zagzaouene locality.

3- Middle Lias-Upper Lias boundary stage: this period is marked by a second tilting movement of the Ait Sedrat block, always southward. It's engendered the deposit thickenings and facies changes southward. The tilting results of an extensional deformation trending WNW-ESE to NNE-SSW. This orientation of tension generated a left-hand shear which appears for the first time on the faults trending N70 in this period. This extension is also recorded in limestone of upper Domerian by neptunian dykes with filling of lower Toarcian sandstone, conglomerate and sandstone-like marl, and hemigraben in collapses southward.

4- Aalnian to Bajocian stage: during this period, the tectonic recording is relatively less important. The sedimentary data shows that the set up available space, during the extensional stage of the Domerian-Toarcian, continuous to fill by marly sandstone and limestone sediments with past turbiditic in the deep zones (foot of block) and of sediments with continental influence in the high zones (head of block). Tilting of block on the main faults NE-SW are very intense with a maximum uprising of the block head (north side of the lkerzi ridge) which stays without sedimentation since basal Toarcian to the Bajocian. During the bajocian transgression, the sedimentation came back in an uniform way on the entire Todrha-Dades basin. On the head of the Kit Sedrat block (north side of the lkerzi ridge) the sedimentation rests in an angular unconformity on a limestone's karst surface of the Domerian. FlF TH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 2&31. 2008

At the end of Bajocian to the beginning Bathonian, a marine sedimentation with very remarkable continental influence (Tillouguite unite) relieves; is superposed by conglomerate, sandstone and silt, openly continental, with tracks and bones of the dinosaurs. The installation of these continental facies at the top of the Jurassic deposits (Bathonian) is probably the result of the total retreat of the sea from the high atlas basin, which related to the beginning of the mountain uprising. Conclusion: in summary the High Atlas of Todrha-Dades is structured, during the lower Jurassic by longitudinal main faults trending NE-SW to N70 and the transverse secondary faults trending NW-SE which are probably inherited from the Hercynian structural pattern. This network of faults has controlled the sedimentation, by a tectonic of block with two deformation phase: first phase as an extensional context from Sinemurian-Carixian to the lower Toarcian with NW-SE to NNW-SSE opening trend. The second phase occurred during middle Lias-upper Lias passage bound, as an extensional context trending WNW-ESE to the NNE- SSW, witch accompanied with a left-hand shear on the N70 trending faults.

Bibliography: Ettaki M. (2003)- Etudes s&iimentologique, stratigrapique et 6volution gkdynamique du Lias debut Dogger de la @ion de Todrha-Dades (versant sud du Haut Atlas Central) implications gbdynarniques. These de doctorat national, Univ. Cadi Ayyad, Marrakech. 423p. lbouh H. (2004)- Du rift avorte au bassin sur dkrochement, contrales tectonique et saimentaire pendant le Jurassique (Haut Atlas central, Maroc). Th&e d'etat Es-Sciences, Univ. Cadi Ayyad, Marrakech, 224 p.

Figure: Block diagram of the Todrha Dades paleogeographic feature during Middle and Upper Lias (Ibouh, 2004). LATE JURASSIC RIFTOGENESIS AT THE CONTINENTAL MARGIN OF THE RUSSIAN FAR EAST AND ITS SEDIMENTOLOGICAL AND PALEOGEOGRAPHICAL RECORDS

Kirillova Galina L.

Institute of Tectonics and Geophysics, Far East Branch, Russian Academy. . of Sciences,65, Kim Yu Chen Str., 680030 Khabarovsk, Russia; e-mail: kirillova-

Late Jurassic riftogenesis in East Asia is correlated with such global events as the disintegration of Pangea, formation of oceans, and beginning of Late Cimmerian movements. These events were preceded by the Middle Jurassic collision of the Siberian and North China cratons. The collision was followed by intense dislocations and magmatism that caused the formation of the Mongol- Okhotsk orogenic belt. In the north-east of Asia, the Kolyma-Omolon superterrane collided with the Verkhoyan passive margin at the same time. As a result, a belt of the collision granites arose. These events led to the regional uplift, sea regression to the east and formation of huge swamped coastal plains framed by low mountains. Terrigenous coal-bearing formations about 1,5 km thick accumulated in them.

In the Late Jurassic, two rift systems developed: a submeridional (I) and sublatitudinal (11). The riftogenesis of system I was manifested in: 1) the volcanic activity (the thickness of the volcanites about 1000 m); 2) formation of the provinces "ridges and basins" (about 300 grabens and halfgrabens); 3) formation of transtensional basins along the northeast-directed strike-slips of the Tan-Lu System. The grabens reached 10 km in depth. They were filled with volcanoclastic material and lacustrine-alluvial coal-bearing sediments. The rate of sedimentation at the synrift stage was 160-240 m/Ma. Main sedimentary basins of this system are the Songliao and Amur-Zeya petroliferous basins and Bureya coal-bearing basin.

The riftogenesis of system II followed the collision processes that took place in the Mongol-Okhotsk orogenic belt. Along the suture, beginning from East Trans- Baikal to the Okhotsk Sea, a system of narrow coal-bearing basins (Mogotuisk, Kholodzhikan, Strelkin, Uda and others) emerged. To the north of the suture, in the rear of the magmatic arc, the South Aldan coal-bearing back-arc basin was formed. It has an asymmetric form of a half-graben with a steep southern and gentle northern flanks. Late Jurassic terrigenous sediments are 3000 m thick. The Stanovoy Ridge served as a main provenance, but it was not too high.

JURASSIC PALAEOTECTONIC SCHEME OF CENTRAL AND NORTHERN TUNISIA

RA BHl Mohsen (", CHEKHMA Houcine 'v, CHlKHAOUl Mongi(*

DBpartement de GBologie, Facult6 des Sciences de Tunis, 1060 Tunis, Tunisia ' mparternent de GBologie, Facult6 des Sciences de Gafsa, Tunisia

A structural configuration of central and northern Tunisia during the Jurassic is proposed in this study based on the integration of the main structural features characterizing this era. In fact, during the Jurassic, substratum instability is shown FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet ITunisieJ. March. 28-31, 2008 through stratigraphic hiatuses, condensed series, nodular facies with slumps, reefs, lateral facies variations, and syn-sedimentary faults.

The main intervals, bearing these tectonic fingerprints, are: Carixian-Domerian, Upper Toarcian-Aalenian, Upper Bajocian-Oxfordian and Upper Tithonian.

In the Sidi Khalif-El Haouareb region (Central Tunisia), our stratigraphic study, Jurassic-Early Cretaceous series mapping, and syn-sedimentary fault analyses, have revealed the occurrence of several sedimentation areas limited by N-S to NNW-SSE faults.

Within the same context, sedimentary basin analyses of the Sahel and the western side of Central Tunisia using subsurface data, indicate other sub N-S structural unconformities have played during the Jurassic. Of these faults, we can mention the Sidi Ali Ben Aoun fault and the Nasr'allah fault.

In northern Tunisia, at Jebel Zaghouan, the geological map of Castany (1951) shows sub-N-S faults separating Jurassic deposits of different lithologies. In addition, to the West, on the El Fahs and Mejez El Bab regions, we have recognised N-S syn-sedimentary Jurassic faults. Overall, the appraisal of previous stratigraphic studies of outcropping Jurassic series in northern Tunisia (Castany, 1951; Bonnefous, 1972; Peybernes et al., 1996; Soussi 2002), leads us to conclude that during the Jurassic, NE-SW to NE-SW faults (e. g. Zaghouan and Teboursouk) have delimited different sedimentary areas.

Added to these N-S and NE-SW faults, the Tunisian tectonic scheme was even more enhanced with E-W and WNW-ESE strike slip faults, parallel to transform faults affecting the Tethys Domain. Therefore, our proposed new scheme infers that during the Jurassic, central and northern Tunisia deposits were mainly controlled by N-S, NNE-SSW and NE-SW normal faults associated to E-W strike-slip faults under an extensional regime associated to the Tethys rifting system. This observation contrasts with other works, which introduced a schematic structural configuration of the Tunisian Margin during the Jurassic-Early Cretaceous based on E-W hypothetic normal faults.

References Bouaziz S. et al., 2002, Tectonic evolution of the northen africain margin in Tunisia from paleostress data sedimentary record. Tectonophysics, 357, pp; 227-253. Bonnefous J., 1972, Contribution a I'etude stratigraphique et micropal&ntologique du Jurassique de Tunisie. These Sci. Univ. Paris VI. Castany G., 1951, L'Atlas tunisien oriental, Annales des Mines et de la Gblogie n08 Service Gblogique de Tunisie. Peybernes et al., 1996 Le jurassique et le Cretac6 basal de la Tunisie atlastique nord-occidentale. Essai de correlation avec les formations de la dorsale Tunisienne et de la ride Ammar-Djedeida. C. R. A. S. Paris, serie 2, 323(2) : 153-162. Soussi M., 2002, Le Jurassique de la Tunisie atlasique, stratigraphie, dynamique sedimentaire, pal6ogbgraphie, et inter3 petrolier, Docum. Lab. Lyon, n0157 FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammarnet (Tunisia). March. 28-31. 2008

JULIAN HIGH: EXAMPLE OF DROWNED JURASSIC PLATFORM FROM JULIAN ALPS (EASTERN SOUTHERN ALPS)

University of Ljubljana, Faculty of Natural Sciences and Engineering, Department of geology. Riwz 11. 1000 Ljubljana... . Slovenia; 'e-mail: andral.smucbntf.uni-Il.sl,tel: 00386 31 508 295, fax: 00386 1 4704 560; 'email: bostian.rozicbnff.unl-Il.sl, tel: 00386 1 2445 409

The Julian Alps comprise the north-western part of Slovenia and extend into the easternmost part of Italy. Structurally they belong to the Julian Nappe which, together with the south-lying Tolmin Nappe, represents the easternmost continuation of the Southern Alps that are overthrusted over the Dinarides. In the Jurassic, the Southern Alps and Dinarides belonged to the Adriatic-Apulian microcontinent, bordered to the north and west by the Alpine Tethys and to the east by the Vardar Ocean. Palaeogeographically, from the Late Triassic to the earliest Jurassic, the Julian Alps belonged to a relatively uniform carbonate platform called the Julian Carbonate Platform. During Early Jurassic rifting, the platform was dissected into blocks with different subsidence rates, forming a horst-and-graben structure. Some of these blocks became part of a deeper basin (Bovec Trough) while other formed an isolated pelagic carbonate platform named the Julian High.

All successions of the Julian High belong to the Julian Nappe. The distinctive characteristic of the Julian High is that Pliensbachian platform limestones of the Julian Carbonate Platform are unconformably overlain by Bajocian to Tithonian condensed limestones of the Prehodavci Formation. The Prehodavci Formation is up to 15 m thick, consists of Ammonitico Rosso type limestone and is subdivided into three members. The Lower Member is condensed, red, bedded bioclastic limestones with Fe-Mn nodules that pass into light-grey, indistinctly nodular limestones. The Middle Member is present only at places and consists of thin- bedded micritic limestones. The Upper Member unconformably overlies the Lower or Middle Member. It is represented by red nodular limestone, and by red-marly limestones with abundant Saccocoma sp. The Prehodavci Formation unconformably overlies the Upper Triassic to Lower Jurassic platform limestone of the Julian Carbonate Platform. The contact is marked by a highly irregular unconformity surface. The Prehodavci Formation is overlain by the upper Tithonian pelagic Biancone limestone. In the most condensed sections of the Julian High the Prehodavci Formation is missing and the Lower Jurassic platform limestones are penetrated by polyphase Jurassic neptunian dykes and unconformably overlain by middle Cretaceous Scaglia Variegata or Senonian Scaglia rossa.

The sedimentary evolution of the Julian High is similar to those recognized westward in Trento Plateau and records following geotectonic events:

1) Emergence and carstification of part of the Julian Carbonate Platform in the Pliensbachian due to an extensional tectonic phase. Aditional hypothesis is drowning of the platform and formation of unconformity surface by sea-floor dissolution. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008

2) The accelerated subsidence and drowning in the Bajocian that enabled sedimentation of the Prehodavci Formation on the central part of the Julian High, while marginal parts were affected by polyphase fracturing and non-deposition.

3) The late Tithonian: start of sedimentation of the Biancone limestone. FFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamef (Tunisiel. March. 2E3f. 2008 Session VI:

MINERAL RESOURCES AS ECONOMIC POTENTIAL FFTH INTERNATDNAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 26-31. 2008 FIFTH INTERNATONAL SYMPOSIUM OF IGCP 506- Hamrnamet (Tunisia). March. 28-31. 2008

TRIASSIC-JURASSIC MARBLES IN OPHlOLlTlC SERIES AT KARAMAN, CENTRAL TURKEY

Adnan Doyen & Ercan Sijmer

Selcuk university, Engineering and Architecture Faculty, Geology Department, KONYNTURKEY E-mail: ~ovenbselcuk.edu.tr

The marble deposits known as Karaman Toros beige is located between the towns of Burhan and Morcal~(Karaman). The marbles in the region were formed insmall and large blocks within the ophiolitic rocks Beige and pale gray coloured marbles are made up of sparitic calcite with lesser amount of clay and rock fragments. The age of these ophiolites is Mesozoic altough the while serie span from Permian to Upper Creteceous. These ophiolitic serie also include Triassic and Jurassic marbles.

The physical properties such as unit weight, water absorption at atmospheric pressure (by weigth and volume), ratio of fullness, porosity, hardness and mechanical properties such as compressive strength, Impact strength, tensile strength, bending strength and loss of strength after freezing these marbles were investigated.

The physical and mechanical test result of the marbles are broadly found in agreement with the Turkish Standards Institutes required Standard valves fort he natural stones for their use as building stones.

GEOCHEMISTRY OF THE JURASSIC EXTREIVES IN RELATION WITH EVOLUTION OF THE NEOTETHYAN OCEAN FROM CENTRAL- WESTERN TAURUS MOUNTAINS, SOUTHERN TURKEY

Kocak, K., Baq H.

Selcuk University-KONYA

Key-words: Taurus Mountains, island arc, fractional crystallization, Neotethyan Ocean.

Mesozoic extrusives are developed with non-ophiolitic associations in various tectonic units in the Taurus Mountains; Fele samples of Geyikdagi unit are Middle-Upper Jurassic in age, with composition of basalts while middle - late Triassic Akseki and Kumluca samples were formed in Antalya units, showing compositions of basalt Itrachytelnephelinite, rhyodacite - dacite and rhyolite. From Bozkir unit, Upper Jurassic-Upper Cretaceous Alanozu samples have compositions ranging from basalt through trachyandesite to rhyolite. Spilitisation is common alteration type, inducing partly mobilisation in alkaline elements, particularly in Alanozu volcanics.

All extrusives are largely tholeiitic in composition, and usually have high large ion lithophile elements (LILE) and low-normal high-field strength elements (HFSE). CO-variationof major and trace element contents in the extrusives suggest fractional crystallization of olivine, pyroxene, plagioclase and Cr-spinel. Volcanics of Fele, Akseki and Antalya are typically enriched in Rb, Ba, Th, K, and possibly formed within plate setting. However, Alanozu samples are characterized by high WSr, RbISr, HFSElLlLE ratios, and may be produced in an island-arc environment. Consequently, extrusives of Fele, Akseki and Kumluca were probably produced as a result of riftingINeotethyan Ocean transition in Late Triassic-Jura, and then environment possibly transformed into an island arc in Upper Cretaceous, as evidenced by the Alanozu volcanics.

PETROGRAPHIC AND BlOMlCROFAClES CHARACTERISTICS OF THE TUNISIAN JURASSIC STONES USED IN ORNAMENTAL, SCULPTURE AND MOSAICARCHAEOLOGICAL AND MODERN WORKS

LA YEB Mohsen l, Boughdiri Mabrouk & ABlRl Abdelkbrim '

' Labwatoire des Ressources Min&e/es et Energdtiques, I. S. A. M. Siliena, 6100 - Tunisie. Lebwatcire de Gddogie, Facdtd des Sciences de Bizerte

For several centuries, Tunisia has provided a very wide range of marble stones that differ by their nature, age and petrographic characteristics. The Jurassic stones, by their high physical quality (colour, texture and resistance), are still the more appreciated materials for construction, ornamentation, sculpture and mosaic pictures confection. They knew a considerable diffusion in the most famous archaeological sites (Chemtou, Bulla Regia, Carthage, Dougga, Zama Regia.) and continued to nourish the industry as very Tunisian marbleworker that foreign (architectural decor, architecture of wall lamps, sculpture and mosaic). The more used are the marbles of Chemtou and the Ichkeul, the shales of Borj Helal and the chalky marble stones of the Jebel Aziz and the Jebel Oust. The petrographic and paleontological analyses of rock samples from the archaeological sites of Chemtou, Bulla Regias, Douggas and Zama Regias as well as some ancient and modern careers permitted to clear the main petrographic and palaeontological features of these materials. These constitute a basis for the diagnosis of weathering and a necessary tool towards the restoration of the patrimonial goods. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammarnet (Tunisial. March. 2831. 2006

UPPER JURASSIC-UPPER CRETACEOUS AGED HCIALABAZ FORMATION: SOURCE ROCKS OF THE IRON-RICH BAUXITES IN THE SARKIKARAAGAC AND YALVAC REGIONS, SW TURKEY

Stkjiit Ali Rlza

Selpuk Universitesi, Muhendislik-Mimarl~kFakultesi, Jeoloji Mijhendisligi Boliimu, 42003, KampOs, Konya-Turkey Once1 Mehrnet Salirn

Gebze Yiiksek Teknoloji Enstitiisii,Miihendislik Fakiiltesi, Cevre Miihendisligi Baliimii, Gebze, Kocaeli, Turkey Corresponding author: Ali R~zaSogut ~rsoautbselcuk.edu.tr~ Phone: +90 332 223 21 98 Fax: +90 332 241 06 35

Key-words: lron rich bauxite, Hac~alabaz formation, dolerites, Sarkikaraagaq, Turkey

The Hac~alabazformation, Upper Jurassic-Upper Cretaceous aged, made of dolomite at the bottom, dolerites and laterites in the middle and limestones at the top. The Seydigehir formation is found as basement rocks in the region. Below this formation, the Caltepe limestones of Cambrian age locate the columnar section. The Hacalabaz formation is covered by Cenozoic aged units with widespread angular disconformities. The Bagkonak formation (made up of conglomerate, sandstone, mudstone and claystone) and the Yar~kkayaformation (composed of marl, clayey limestone and fossiliferous limestone) are the main rock units of Cenozoic era.

lron rich bauxites are very common in between the small towns of Sarkikaraagaq and Yalvaq, SW Turkey. Bauxitic zone roughly found in about 50 km horizon orienting from southeast (Sarkikaraagaq) to northwest (Yalvaq). The zone reportedly has approximately 115 million (1 15000000) tons of bauxite ore.

SOME GEOLOGICAL AND GEOCHlMlCAL FEATURES OF LATERlTlC Ni AND Fe OCCURENCES IN SERPENTINITES OVER THE JURASSlC BASEMENT, ESKISEHIR, TURKEY

Zedef Veysel and Agaqayak Tevfik

Selquk Universly, Faculty of Engineeringand Architecture, Department of Mining Engineering,42003, Konya-Turkey; e-mail: vzedefbselcuk.edu.tr

Key-words: Lateritic Ni and Fe, serpentinites, Jurassic basement, Turkey

Approximately 8 % of the land area of Turkey is covered by ultramafic rocks which mostly serpentinised. These ultramafics have some important industrially valuable minerals such as chromite, magnesite, olivine and copper ores. For the last decade, some economically mineble niceliferous ores were discovered at Manisa, Ugak and Eskigehir, in western Turkey. These deposits are in the form of laterite and strictly related to altered ultramafics. At most cases, the ultramafics are FIFTH INTERNATONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2008 found over the Jurassic limestone basement which has crystalline and microcrystalline fabrics. In this study, we examine the Ni and Fe content of the lateritic occurrences of Sarnlqtepe, Belek and Adatepe, all located in Eski~ehir province. The ore is like loose-limonite and brown to yellowish in color. Preliminary investigations revealed that the ores have a 1.41 % Ni (on average) and 17.11 % Fe (on average). Undoubtedly, these grades for Ni and Fe indicate that these occurrences can be mined in economically. POSTERS FFTH INTERNATIONAL SYMPOSIUM OF IGCP $06 - Hammemet (Tunisia). March. 28-31. 2006 FIFTH INJERNAJlONAL SYMPOSIUM OF IGCP 506- Hammarnet (Tunisia). March. 28-31. 2008

THE MACONNAIS LIMESTONES (FRANCE): AN EXAMPLE OF STORM DEPOSTS DURING AALENIAN-BAJOCIAN

Benyahia M.', Marok A.', Kerfouf A.', Rahrnani A.' et Moueddene K'

'~6partementdes Sciences de I'Environnement, Facult6 des Sciences. Universit6 Djillali LIABES, SlDl BEL ABBES, 22000, ALGERIE. E-mail : ~nva133@vahoo,fr

'~bpartementdes Sciences de la Terre, Facult6 des Sciences, Universit6 Aboubeker BELKAID, TLEMCEN, 13000, ALGERIE

Key-words: Carbonate platform, Aalenian, Bajocian, Mdconnais, biomicrofaaes, silicification, sequence stratigrahy.

The studied series, located on the Mgconnais carbonate platform, includes Upper Aalenian (Parkinsoni zone) and Middle Bajocien (Humphriesianum zone Bajocian) formations. They consist of limestone and argillaceous facies, rolled-iron products, rich in microforaminifera and sponge spicules.

The sedimentological analysis of these rolled deposits based on microfacies and sedimentary microstructures interpretations as well as on macroscopic data and diagenetic records (silicification and cementation), allow to distinguish two different facies groups, especially varying regarding the abundance of foraminifera and the frequency of sponge spicules and the lateral organization of laminations.

The microforaminifera facies is inserted between a limestone level with encrustings, at the base and another shelly limestone, to the top. However, the sponge-remain- rich facies overly a limestone with silicified shells which grades up into a Ostrea acuminata bearing limestone. The onset of these deposits took place on a hardened bottom as expressed by an observed perforated surface. This underlies the deposit suspension and then the sedimentation of laminite facies (storm deposits);

The observed various microstructures (lamination) may have three different origins: mechanical (most representative), biological (trace fossils), and physicochemical as expressed by silicon accidents. The combined data plead in favour of an environmental evolution within the tidal platform undergoing the effects of storms (limestone Formation with intersected and truncated litage), on Foreshore (Madreporary limestone Formation limestones), on Offshore (silica-rich limestone Formation) and on lower Offshore (brachiopod- bearing argillaceous limestone Formation. This environmental evolution is expressed, in term of sequential organization, by cycles of sea level fluctuation. FAULT SYSTEM ANALYSIS OF THE ZEUSS-KOUTINE AQUIFER (SOUTHERN TUNISIA): NEW INSIGHTS INTO RESERVOIR MODELLING

Hayet CHlHl

Centre de Recherches et Technologies des eau& Laboratoire de GBoressources Route Touristique da Soliman, B.P. 273. 8020 Soliman, Tunisie E-mail :

In Southern Tunisia, water resources of good quality are relatively rare and could not be renewed easily due to the semi-arid climate prevailing in this area. This is mainly the result of the significant demographic growth which has caused an increasing request for water not only for irrigation but also for drinking. In addition, we are now facing a crucial problem of water quality deterioration induced through the considerable economic growth coupled to the overexploitation of water resources in the area. The various aquiferous systems which supply the area, provide water with a salinity varying, from 1 to 7 gll. The reasons which might be advanced to explain this relatively high mineralization are marine intrusion, brackish water intrusions drained from adjacent saliferous systems and the proximity of hyper-saline water systems like Sebkhas and Chotts.

The Zeuss-Koutine aquifer system, which is the main water resource in the area, is a vulnerable system and hence, needs to be further documented and monitored in order to preserve it and improve its water quality.

One of the most important feature that characterize this water system, and which would be of a crucial impact, is its geological complexity particularly due to the intense tectonic affecting the various aquifers. As fault systems commonly influence reservoir communication, our study focuses on a detailed analysis of the aquifer fault geometry and its relevance to water drainage.

For that purpose, we integrated seismic data analyses, outcrop analog observations, and hydrogeological data, in order to bring new insights on the evolution of normal fault systems.

In the proposed workflow, top Jurassic depth map is modelled using estimation techniques, based on geostatistii (kriging) using ISATIS software. A certain number of normal faults, clearly visible on seismic sections, were integrated in the modelling approach.

The methodology is developed in order to best reflect geological structure of the field. The results obtained through this study are critical as they will help building up an accurate architectural model of the aquifer system, which will be, finally, used to characterize the effect of faulting on transmissibility within the reservoir. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31, 2008

PALAEOGEOGRAPHIC AND DlAGENlC CONTROLS ON CLAY MINERALS OCCURENCES IN THE JURASSIC SEDIMENTS COMPARED BETWEEN THE WESTERN HIGH ATLAS (MOROCCO) AND THE TUNISIAN ATLAS

Daoudi ~ahcen',Medhioub ~ouni#,Soussi ~ohamed'& Jamoussi ~akher'

' Dbpartementde GBologie, Facult6 des Sciences et Techniques de Marrakech. cc daoudihfsta-marrakechi.ac.ma )) Npartement de GBdogie. Facult6 des Sciences de Sfax 3018, Sfax-Tunisie. Mpartement de GBologie. Facult6 des Sciences de Tunis. 1060 BelvbdBre. Tunis. Tunisie. Laboratoire de GBoressources CERTE BP 273.8020 Soliman Tunisia, [email protected]

The western High Atlas of Morocco and the Tunisian Atlas represent the two extremities of the Maghrebian atlasic chain. The aim of this study is to compare the clay assemblage composition and significance in these two domains.

In the Western High Atlas basin, the composition and the evolution of the clay assemblage are different between the two sides of the basin. In the south (Agadir basin), the clay assemblage is characterised by the illite and chlorite abundance downward to the detriment of smectite and kaolinite and by the improvement, with depth, of illite cristallinity witch evolve from 7 to 3 "2 . This evolution suggests clearly the effects of burial diagenesis on clay assemblages with depth. In the north (Essaouira basin), clay assemblages identified on Jurassic sedimentary series is mainly composed by smectites and smectite mixed-layers. Kaolinite is also present in these series with small quantities. Generally, the vertical variation of illite contents and its cristallinity doesn't show a significant evolution in depth. This suggests that the effects of the depth of burial on clay assemblages of these series are negligible. Thus, variations in clay assemblages of the Essaouira basin series express palaeogegraphic evolution rather than variations on post sedimentary processes. Furthermore, contrary to Agadir basin, where burial of upper Jurassic series is more than 3000m, the one of Essaouira basin doesn't exceeds 2000 m. However, the difference in thickness of these two series can not be the only reason of the mineralogical differentiation between the two localities. Several studies show that the temperature and the environment of sedimentary series are the most important factors than pressure and time. Indeed, in the Essaouira basin, geothermal gradient is moderated, identical to the one of passive margin with slow overstretching (2,7 "C/IOOm). This takes along a banal effect of sedimentary burial on clay composition, with temperatures of about 75°C from 2000 m of depth. However, in the Agadir region, several studies show that the temperature conditions are most important than those of Essaouira. This explains by the proximity of south atlasic zone faults. In the Tunisian Atlas the mineralogical composition of clays is little different. The Jurassic clay from the South to northern Tunisia is characterized by a predominance of illite beside the kaolinite and chlorite sometimes associated with few of smectite. The Jurassic in Tunisia is formed by the association of illite, kaolinite with a bit of chlorite in the northern Atlas. We note the presence of the smectite in the Jurassic of the Atlas Central (Soussi, 1990), which raises the question of its origin.

Thus, we believe that in the Saharan platform, central and northern Atlas there has been erosion of previous levels, as is the case Triassic very rich in illite, chlorite and very often in kaolinite, which gave the even mineralogy. Jurassic clay lying in the anchizone are those of the upper Jurassic of Jebel Oust (J01 and OS4), Jurassic of Bougarnine Fahs (BF1, BF20a), and Domerian Toarcian of Jebel Zerras (ZR119a). The other clays are in the field of diagenesis. In Tunisia, the only levels in epizone are the Permo-Triassic Hirech confirming the metamorphism suffered by these levels.

MORPHOLOGICAL AND MORPHOMMETRICAL DISCRIMINATION OF TWO POPULATIONS OF LEIOCERATINAE (AMMONITINA) FROM MOROCCO AND PORTUGAL

Khadija EL HARlRl ', Ali BACHNOU ' & Maria Helena HENRMUES

'~niversityCadi Ayyad, Faculty of Science 8 Technology Guhliz, B.P.,?, Department of Earth Sciences, Laboratory of Geoxiences and Environment, Marrakech MOROCCO. -. bachnou@fsta- marrakech.ac.ma). '~epartamentode Cencias da Terra, Faculdade de Ciencias E Tecnologia, Central of Geociencias, Universidade de Coimbra, Largo Marks of Pombal, 3000-272 Coimbra, Portugal.

Leioceratinae constitute the essential of the fauna of lower Aalenian where they appear from its extreme base. They are characterized by thin ribs, simple or gathered in beams. Leioceratinae start to diversify during the Comptum zone where we found an association with striated and ribbed forms. Two main subgenera are studied here: Leioceras and Cypholioceras considered as a dimorphic pair. Leioceratinae include complex morphotypes difficult to recognize by a simple connotative terminology, regarded here as a subjective approach inducing many taxinomic confusions.

The aim of this study is to establish a morphommetrical framework where we attempt an objective shape characterization. Also a morphommetrical analysis, using a morphological quantification based on the Fourier descriptors, was undertaken for two populations of Leioceratinae from two distinct localities: l - the central High-Atlas (Morocco); and 2- the Lusitanian Basin (Portugal). The analyzed characters are those usually considered by the authors for the subfamily diagnosis such as: the shape of ribs, rib termination, division of ribs, node amplitude and the rib junction point.

Hence, we focus on more precise elements' analysis for a reliable interpretation of Leioceratidae morphological diversity inorder to define principal convergences between the different analyzed taxa. In fact, the ammonite assemblages through the Lias-Dogger interval exhibit many biostratigraphic and paleobiogeographic changes which it is revealed very interesting to illustrate by means of these morphommetrical analysis.

Within the Aalensis biozone, the registred ammonite associations show a clear Tethyan affinities supported by the abundance of Hammatocerataceae, Lytoceratina and Phylloceratina taxa. The Opalinum and Murchisonae biozones rather show NW-European influences, with a predominance of Leioceratinae and Graphoceratinae representatives, allowing a wise biozonation at the subzone level.

The mathematical modeling of the rib shape allowed to quantify the morphological differences between taxa and the access to morphological maps where differences and similarities in shape between Leioceratinae are more FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammarnet (Tunisia). March. 28-31, 2008 objective; the qualitative assessment of morphological changes between taxa from distinct biogeographical areas become then more evident.

POTENTIAL USE OF LATE JURASSIC CLAYS OF CENTRAL TUNISIA IN CERAMIC TILES MANUFACTURING

Hajjaji Walid ', Hachani Mondher ', Jeridi Kamel ', Soussi Mohamed ', Lopez-Galindo Alberto ', Rocha Fernando ', Lakincha JoZo and Jamoussi Fakher '

'G6oressources laboratory, CERTE BP 273, 8020 Soliman, Tunisia; e-mail: W [email protected] '~acultyof Science Tunis. 1060- Belvedere Tunis, Tunisia 31~~~.~~~~-~niv.Granada. Avda. Fuentenueva, 18002-Granada, Spain 4~entrode Investiga~ao'Minerais lndustriais e Argilas" (FCT), Univ. Aveiro, Campo de Santiago. 3810 Aveiro, Portugal 5~eramicsand Glass Engineering Dept 8, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal

Key-words: Late Jurassic clays; ceramic tiles; technological properties; firing transformations.

This study was promoted in order to valorise the Late Jurassic deposits in ceramic tiles manufacturing, sampled from two major domains: north-south axis and central Atlas. The contributions about these materials of Sidi Khalif formation, composed mainly by clays, were normally conducted and oriented to their potential interest as petroleum source. The primary part of this investigation concerned the chemical-mineralogical characterization of the clay deposits. X-ray Diffraction reveals the predominance of illitic-kaolinitic phases and variable amount of quartz and feldspars as accessory minerals. Samples are mainly classed as silty to sandy silty clays, and are chemically composed of SiO2, Al203, Fe203, CaO, and MgO whereas MnO, Na20, K20, Ti02, and P205 are present an minor oxides. Thermal analysis (DTAITG and dilatometry) complemented their characterization and gave information on the formation of crystalline and amorphous phases upon firing. Technological properties of pressed bodies were estimated after drying and firing at distinct temperatures (900, 950, 1000, 1050, and 1 1OO°C) Relevant properties such as the porosity, bending strength and linear shrinkage were estimated in lab-scale tests that intend to follow real industrial conditions. Results were compared with those of commercial tiles (Tunisian and Italian) and proved the potential of the selected sandy clays in upper part of the late Jurassic sequence in the production of similar materials, once implemented minor production changes to minimise the linear shrinkage. FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 28-31. 2006

QUANTITATIVE BIOGEOGRAPHY OF THE UPPER AALANIAN-LOWER BAJOCIAN AMMONITES (WESTERN TETHYS)

Marok A.'. Hadji P', Sebane A.: Soulimane C.' Benyahia M.'

'~epartrnentof Earth Sciences, Faculty of Sciences, Universny Abou Bekr Belkald. B.P. 119, Tlemcen, Algeria. E-Mail :

'~epartrnentof Earth Sciences, Faculty of Earth Sciences, Geography and Amenagment of Territory, University EsSenia, B.P. 1524.- Oran, Algeria. Department of EnM'ronrnent, Facultyof Sciences, Universite Djillali LiaMs. B.P. 89, Sidi Bel Abk,Algeria.

In order to quantify the biogeographic dynamics of ammonites faunas of Upper Aalenian-lower Bajocian, 9 areas located in Western Tethys were analyzed by the multivariate method (Principal coordinate analysis and calculating similarity index and distance). This is : Dorset-Somerset, the Lusitanian basin, the Iberian Cordillera, the Betic Cordillera, the South-east of France basin, the Umbria-Marche Apennines, Beni Snassen, the Folded Middle Atlas and the central High Atlas. These various areas have been selected for their relatively precise biostratigraphic data.

1. Data Processing

Quantitative data processing (abundance)

For the analysis of abundance data, we used the software PAST- PAlaeontological Statistics, ver. 1.30. The matrix obtained in term of genera number per family for each area has been treated by using principal coordinate analysis and hierarchical ascendant classification. The latter is the result of distance measurement based here on the Bray-Curtis's coefficient. It makes possible to gather the areas according to their proximity in taxonomic term of composition. However, it is important to stress that the choice of the algorithm calculation of distances depends on the type of the elaborated matrix. In our case, the matrix manufactured starting from 12 families and 9 areas hardly adapts to the use of distance index (Chord, Manhattan and Pickford) often employed by certain authors for more important data.

Qualitative data processing (binary)

Contrary to the preceding method, we chose, for the qualitative data analysis (binary), the software BG-Index ver.l.1 P. The aim was to compare the degree of resemblance or dissimilarity between each couple of lists generated by the data base. This degree has been calculated by the index of similarity (coefficients of Simpson, Jaccard, Dice and Braun-Blanquet) or of distance (Bray-Curtis coefficient) from a chronological viewpoint, by carrying out calculations interval by interval.

2. Results and discussion

Quantitative comparison of the intrafamily taxonomic richness between areas

Thus, from this intrafamily genera richness, three principal groups come out. A first group made up of three areas: Umbria-Marche Apennines basin, Beni FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammarnet (Tunisia). March. 28-31. 2004

Snassen and folded Middle Atlas. It is more or less isolated on the hierarchical ascendant classification. A second intermediate group: Dorset-Somerset and Lusitanian Basin showing an intrafamily genera composition relatively nearby. Finally, four remaining areas: lberian cordillera, Betic Cordillera, South-east of France and central High Atlas form the third group. This group marked by the prevalence of three families (Graphoceratidae, Sonniniidae and Stephanoceratidae) has an intrafamily genera richness extremely similar. This taxonomic organization does not correspond to any obvious geographical gradient, as well latitudinal as longitudinal. Its significance is thus ecological andlor physiographical.

Qualitative comparison of the taxonomic composition between areas

From the similarity and distance matrix obtained with 5 indexes, we have analyzed here the similarity of faunas by comparing the 9 areas for each Upper Aalenian-Lower Bajocian interval.

-Interval 1: Concavum zone

During this interval, general topology shows that faunas of the Betic Cordillera and lberian Cordillera are the most nearly similar and share 22 genera (57 %). The distance separating this fauna and that from the three areas: Beni Snassen, folded Middle Atlas and the Umbria-Marche Apennines basin is maximum, which corresponds to a little marked fauna1 isolation in the domain of Western Tethys.

-Interval 2: Discites zone

From this period, general topology starts to change by the bringing together of the folded Middle Atlas and those of the Dorset-Somerset faunas. These two areas marked by primarily condensed deposits have 8 genera (Euhoploceras, Docidoceras, Toxolioceras, Braunsina, Bradfordia, Fontannesia, Haplopleuroceras and Trilobiticeras). For the other areas, the similarity gradient is the same one.

-Interval 3: Laeviuscula zone During this period, a new similarity gradient is indicated. It's characterized especially by:

-The large ressemblance between the lberian Cordillera and the central High Atlas faunas. This resemblance is related to the presence of 26 genera common to the both areas (70 %).

-The fauna distance of Dorset-Somerset compared to those of the South-east of France.

-The bringing together of faunas of the folded Middle Atlas of those of the South- east of France. We could record 8 genera in commun (Bradfordia, Emileia, Euhoploceras, Gerzenites, Pelekodites, Sonninia, Trilobiticera and Witchellia).

-Interval 4: Propinquans zone During this interval, the modification of general topology is accentuated. Thus, we have distinguished: -A great ressemblance enters faunas of the central High-Atlas and those of the Betic Cordillera. The two areas share 19 genera in commun runs (54%).

-A fauna distance of the Southeast of France compared to those of the folded Middle Atlas. The South-east basin of France presents at this period an intermediate similarity between the Iberian Cordillera and the Lusitanian basin.

-A fauna distance of Dorset-Somerset towards the South. They form with faunas of the Umbria-Marche Apennines a new node. The total number of genera is 7 (Emileia, Kumatostephanus, Labyrinthoceras, Otoites, Papilliceras, Skirroceras and Stephanoceras).

-Interval 5: Humphriesianum zone

During the Humphriesianum zone, inferred topology differs appreciably. The bringing together, between faunas of the central High Atlas and the folded Middle Atlas on the one hand and faunas of the Lusitanian basin and the Umbria-Marche Apennines on the other hand, is related to the quality of the faunal register. With regard to the other areas, the faunal distances show light modifications.

PRELIMINARY REPORT ABOUT SPECTACULAR LATE PLIENSBACHIAN DINOSAUR TRACKSITE FROM THE HOLY CROSS MOUNTAINS, POLAND

'~epartmentof Paleob'ology and Evdutiin, Faculty of Biology, Warsaw Universly, ul. S. Banacha 2, PL-02-097 Warszawa, Pdand. e-mail: '~epartmentof Historical Geology, Faculty of Gedogy, Warsaw University, ul. Zwirki i Wigury 93, PL-02-089 Warszawa; Poland. amail: . . 3~olishGeological Institute, ul. Rakowiecka 4, PL-00-975 Warszawa, Poland. e-mail: p

Well-preserved theropod, sauropod and ornithischian dinosaur tracks from a newly discovered site in Szydl6wek in the Holy Cross Mts. (Drzewica Formation, Kamienna Group, Upper Pliensbachian) are mostly assigned to the dinosaurian ichnogenera Eubrontes, Anchisauripus, Parabrontopodus with some assigned to cf. Megalosauripus, d. Kayentapus, and cf. Anomoepus. The nondinosaurian ichnogenera Batrachopus and cf. Brasilichnium are also reported. The ichnofauna is similar to some others from the region of the Holy Cross Mountains and other classic ichnofaunas of the Early Jurassic age from the Italy, France and elsewhere. However, their abundance, excellent preservation as shallow natural casts and sometimes as natural moulds (some with pad and claw impressions), sheds new light on the late Pliensbachian dinosaur ichnofauna, which is still not well known.

Three gigantic theropod dinosaur tracks (named as cf. Megalosauripus) reveal huge metatarsal pad impressions. This feature is very interesting from palobiological point of view. These intriguing gigantic ichnites are more similar to large prints left by the Middle-Late Jurassic theropods, than to other finds from the Early Jurassic. Similar tracks were found in the Holy Cross Mountains in the alluvial plain deposits of the earliest Jurassic (Hettangian) tracksite at Soltykow. This new find suggests that gigantic theropod occupied varied environments and usually FIFTH INTERNATIONAL SYMPOSIUM OF IGCP 506- Hammamet (Tunisia). March. 2&31. 2QQ4 coexisted with large herbivorous dinosaurs as sauropododomorpha (Parabrontopodus ichnotaxa).

The paleogeographic and stratigraphic setting of the tracks suggests single track-making episode in a foreshorelbarrier-fluvial settings. Body fossils include palynomorphs, wood trunks, roots, brackish bivalves, and limuloid animals. Coniferous wood trunks are particularly abundant in this setting, pointing to occurrence of vast coniferous forests around the track site. This is an interesting association of coniferous forest and dinosaur megafauna, suggesting colder and drier climate in the late Pliensbachian times.

FIRST RECORD OF PLlNTHlTlC PALAEOSOIL FROM THE MIDDLE-UPPER JURASSIC UNCONFORMITY OF SOUTH-IBERIAN PALAEOMARGIN (BETIC CORDILLERA, SE SPAIN)

Reolid Matias, Abad Isabel, Martin-Garcia J. Manuel

Departamento de Geologia. Universidad de JaBn. 23071 JaBn, Spain mre0Iid~aen.e~:[email protected]: immartin0uiaen.e~

Discontinuous sedimentation is very characteristic of epicontinental shelf environments of the South-Iberian Palaeomargin during the Middle-Upper Jurassic transition. In the Jurassic palaeogeography of the South-Iberian Palaeomargin, the Prebetic represents a proximal epicontinental shelf. The Prebetic is the most external northern part of the Betic Cordillera, the westernmost European Alpine chain. Iron crust and ferruginous coated grains related to the Middle-Upper Jurassic transition in the Prebetic are distinctive and recognizable deposits, marking the unconformity between the shallow facies (Middle Jurassic) and the hemipelagic ferruginous oolitic limestones (Upper Jurassic). The ferruginous coated grains can be subdivided into two types. Type-A ooids and pisoids are characterised by thin, regular lamination in concentric layers enclosing a nucleus; they are the dominant in the top of the iron crust (100%) and in the ferruginous oolitic limestone (82%). Type-B ooids typically have thick, irregular lamination in a few discontinuous concentric layers enclosing a variable nucleus including bioclasts and foraminifera; they are exclusive of the ferruginous oolitic limestone (18%). The chemical composition varies between 80% Fe203 in the iron crust and 67% in the coated grains. In the iron ooids, the contents in AI2O3,Si02, CaO and P205 are higher than in the crust. Trace elements (V, Cr, CO, Ni, Zn, Y, MO, and Pb) in both the crust and ooids show enriched values compared with the bulk composition of the upper continental crust. The mineral composition of the iron crust and ooids is primarily goethite, and minority AI-hydroxide (bohemite) and apatite, whereas hematite is exclusive of the iron crust. The Type-A ooids and pisoids are interpreted as having an origin related to the iron crust which has not evidences to support a marine genesis. Nevertheless the crust has characteristics (chemical and mineralogical composition) similar to those of ferruginous pisolitic plinthite (highly-weathered redoximorphic soil), and goethite shows an AI-substitution range (5-10 mol.%) that indicates pedogenic conditions. Soil processes under periodic hydrous conditions are suggested; groundwater soils with hydrous conditions are congruent with the formation of the Type-A iron ooids and pisoids. A coastal plain with periodically flooded soils would be the likeliest scenario. Bathonian shallow carbonate shelf was possibly emerged and weathered. Marine sedimentation began with condensed and hemipelagic, ferruginous oolitic limestones rich in ammonoids (Middle Oxfordian), which was associated with major flooding of the Prebetic shelf and the erosion of ferruginous pisolitic plinthite. Fragments of iron crust and Type-A iron ooids and pisoids were reworked and incorporated into the marine sediments. A second generation of iron ooids (Type-B) with clear marine features developed (encrusting foraminifera), benefiting from iron- rich microenvironments due to the redistribution from iron crust fragments and Type-A ooids. The record of a plinthitic palaeosoil has important palaeoclimatic implications, as modern plinthite occurs in tropical or subtropical regions. Such palaeoclimatic considerations could be extended along the western Tethyan basins

FERRUGINOUS CRUSTS OF THE MIDDLE-UPPER JURASSIC UNCONFORMITY OF THE BETlC EXTERNAL ZONES (SE SPAIN) AND DORSALE CALCAIRE (MOROCCO)

Departamento de Geologia. Universidad de Jabn. 23071 JaBn. Spain. Departament de Geologic, Universit6 Abdelmalek Essaadi. 93993 Tetouan, Morocco ; e-mails : khalilelkadirihvahoo.fr

The Betic External Zones and the Rifian Dorsale Calcaire represent the North and South palaeomargins of the Western Tethys. In the Jurassic palaeogeography of the South-Iberian Palaeomargin, the Prebetic represents an epicontinental shelf, whereas the Subbetic represents distal epioceanic swell-trough areas. Jurassic sedimentary sequences of the Dorsale Calcaire bear the record of a contrary subsidence resulting in the intermittent collapse of the External Dorsale against the uplift of the Internal Dorsale (the so-called "Jeu de Balance").

The Middle-Upper Jurassic boundary, in the westernmost Tethyan basins is marked by a complex unconformity with conspicuous ferruginous crusts.

In the Prebetic, a thin iron crust with iron ooids and pisoids appears over this unconformity capping the Bathonian oolitic limestones. The chemical (67-80% Fe203)and mineralogical (primarily goethite and hematite, and minority bohemite and apatite) composition of the iron crust is similar to that of ferruginous pisolitic plinthite (highly-weathered redoximorphic soil). A coastal plain with periodically flooded soils would be the likeliest scenario for it. Overlying marine deposits were condensed and hemipelagic, ferruginous oolitic limestones rich in ammonoids (Middle Oxfordian).

In the External Subbetic, this boundary is represented by a first order unconformity, which involves stratigraphical gaps ranging between Upper Bathonian-Middle Oxfordian (minimal) and Middle Bathonian-Lower Kimmeridgian (maximal). Hardgrounds, Fe-Mn crusts, condensed levels, palaeokarst features and neptunian dykes occur associated to the unconformity surface. The unconformity FFJH INTERNATIONAL SYMPOSIUM OF IGCP 506 - Hammamet (Tunisia). March. 28-31. 2006 caps Rosso Ammonitico (RA) facies and locally oolitic limestones. Fe-Mn crusts and macrooncoids coating ammonoids moulds are common. The chemical composition of the crusts is Fe203 (~40%)and MnO (~20%)and the mineral composition is goethite, calcite, lithiophorite and cryptomelane. Microbial laminated fabrics (cyanobacteria and fungi) constitute the banded crusts. Later, the sedimentation began with marly RA facies of the Middle Oxfordian.

In the External Dorsale, this unconformity is observed within the radiolarites and separates the green-bedded radiolarites (Bathonian) from the overlying red ones (Oxfordian-Tithonian). The surface corresponds to a ferruginous crust capping the green radiolarites. The condensation related to this unconformity is recognizable as a distinct radiolarian-rich manganesiferous muddy horizon.

This unconformity is a complex intra-Bathonian event mainly controlled by regional tectonic that induced regional sea-level changes. This event marks the turnover from the "main intracontinental rifting stage" to the "transform continental margin stage", which increased (A) the tectonic, (B) the trough-swell relief in the South-Iberian Palaeomargin and (C) the differentiation between Internal and External Dorsale in the Rifian margin. Shallow carbonate shelves (Prebetic) and swells (Subbetic) were possibly emerged, just before the onset of the major flooding of the Prebetic shelves and Subbetic swells during the Middle Oxfordian. That resulted in pelagic and hemipelagic deposits extended in the South-Iberian Palaeomargin.

The interrelated Fe-Mn hardgrounds - condensed levels acted as good indicators of flooding phases and hence the resulting platform drowning, which reduced the (carbonate) bioproductivity in shallower areas. The Fe-Mn fixing in pelagic environments (External Dorsale and External Subbetic) is interpreted in relation to the chemoorganotrophic behaviour of the benthic microbial communities, while in emerged areas of the shelf (Prebetic) the Fe-Mn crusts are related to groundwater soils.

ORIGIN AND STRATIGRAPHY OF THE WAPlENNlK BRECCIA MEMBER, PlENlNY KLIPPEN BELT, CARPATHIANS, POLAND - A PRELIMINARY REPORT

Agnieszka Sobstyl

Paleobiological Scientific Circle, Faculty of Geology, University of Warsaw Al. Zwirki i Wigury 93, PL 02-089Warsaw, Poland

Key-words: Western Carpathians, Pieniny Klippen Ben, breccia, microfacies

The Pieniny Klippen Belt is a 600 km long, at most 20 km wide, tectonic suture separating the externides of the Western Carpathians (Outer Carpathians) from their internides (Central and lnner Western Carpathians). In its present form, the Pieniny Klippen Belt is a heterogeneous structure consisting of the klippen successions deposited in the Pieniny Klippen Basin, their sedimentary cover and of the elements of the lnner and Outer Carpathians incorporated in the belt during the Late Cretaceous-Early Palaeogene, and Early Neogene folding (Birkenmajer, 1986b,a). FFTH INTERNATONAL SYMPOSIUM OF IGCP 506 - Hammarnet /Tunisia). March. 28-33 1.2008

The studied sediments, the Wapiennik Breccia Member (Birkenmajer, 1958), belongs to the Czorsztyn Limestone Formation developed in the Czorsztyn Suc- cession of the Pieniny Klippen Belt. It represents the shallowest northern zone of the Pieniny basin, the Czorsztyn Limestone Formation, formed on the southern slope of a submarine ridge named the Czorsztyn Ridge. The typical place of the Wa-piennik Breccia Member is located in the eastern part of the Pieniny Klippen Belt, in Szaflary, near Zakopane, Poland (Birkenmajer, 1977).

Diferent sources determine the age of the breccia as Jurassic/Cretaceous boundary (Birkenmajer, 1958, 1977) or Middle Jurassic (Sidorczuk, 2000, 2005). The conducted research is aimed at defining the origin and stratigraphical po-sition of the studied sediments. The sediments attributed to the Jurassic Wapiennik Breccia Member represent red or pink limestone breccia, composed of fragments of white and red crinoidal limestones from the Krupianka Limestone and the Smole- gowa Limestone formations, cemented by red or pink limestone matrix. The breccia is investigated using microfacies and organic-walled Dinoflagellate cysts analyses. The thin sections revealed: crinoidal, foraminifera - shell, Saccocoma and plank- tonic foraminiferal microfacies. Moreover, juvenile snails and ammonites, Globo- chaete spores, Ostracods, bentonic foraminifera and others have been recognized. CERTE m-) UR 9911044