Stratigraphic Table of Germany Compact 2012 a Global Stratigraphic Scale (GSS) Regional Stratigraphic Scale (RSS) (Composite)
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Conodonts and Foraminifers
Journal of Asian Earth Sciences 108 (2015) 117–135 Contents lists available at ScienceDirect Journal of Asian Earth Sciences journal homepage: www.elsevier.com/locate/jseaes An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian–Upper Triassic strata of Guandao section, Nanpanjiang Basin, south China ⇑ Daniel J. Lehrmann a, , Leanne Stepchinski a, Demir Altiner b, Michael J. Orchard c, Paul Montgomery d, Paul Enos e, Brooks B. Ellwood f, Samuel A. Bowring g, Jahandar Ramezani g, Hongmei Wang h, Jiayong Wei h, Meiyi Yu i, James D. Griffiths j, Marcello Minzoni k, Ellen K. Schaal l,1, Xiaowei Li l, Katja M. Meyer l,2, Jonathan L. Payne l a Geoscience Department, Trinity University, San Antonio, TX 78212, USA b Department of Geological Engineering, Middle East Technical University, Ankara 06531, Turkey c Natural Resources Canada-Geological Survey of Canada, Vancouver, British Columbia V6B 5J3, Canada d Chevron Upstream Europe, Aberdeen, Scotland, UK e Department of Geology, University of Kansas, Lawrence, KS 66045, USA f Louisiana State University, Baton Rouge, LA 70803, USA g Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA h Guizhou Geological Survey, Bagongli, Guiyang 550011, Guizhou Province, China i College of Resource and Environment Engineering, Guizhou University, Caijiaguan, Guiyang 550003, Guizhou Province, China j Chemostrat Ltd., 2 Ravenscroft Court, Buttington Cross Enterprise Park, Welshpool, Powys SY21 8SL, UK k Shell International Exploration and Production, 200 N. Dairy Ashford, Houston, TX 77079, USA l Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA article info abstract Article history: The chronostratigraphy of Guandao section has served as the foundation for numerous studies of the Received 13 October 2014 end-Permian extinction and biotic recovery in south China. -
Jahresbericht 2016 Und Mitteilungen
der Bayerischen Staatssammlung für Paläontologie und Historische Geologie München e.V. Jahresbericht 2016 und Mitteilungen 45 Verlag Dr. Friedrich Pfeil München 2017 ISSN 0942-5845 ISBN 978-3-89937-222-9 der Bayerischen Staatssammlung für Paläontologie und Historische Geologie München e.V. Jahresbericht 2016 und Mitteilungen 45 Verlag Dr. Friedrich Pfeil München 2017 ISSN 0942-5845 ISBN 978-3-89937-222-9 Bibliografische Information der Deutschen Nationalbibliothek Die Deutsche Nationalbibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie; detaillierte bibliografische Daten sind im Internet über http://dnb.dnb.de abrufbar. Redaktion: Martin Nose, Oliver Rauhut, & Winfried Werner Anschrift des Vereins Freunde der Bayerischen Staatssammlung für Paläontologie und Historische Geologie München e.V. Richard-Wagner-Str. 10, D-80333 München Tel (089) 2180-6630 Fax: (089) 2180-6601 E-Mail: [email protected] Homepage: www.palmuc.de/bspg Postbank München IBAN: DE75 7001 0080 0281 2128 03 BIC: PBNKDEFF Deutsche Kreditbank (DKB) AG IBAN: DE09 1203 0000 1004 4185 78 BIC: BYLADEM1001 Sonderkonto »Exkursionen«: Postbank München IBAN: DE23 7001 0080 0482 6128 02 BIC: PBNKDEFF Titelbild: Koralle Montlivaltia sp. aus dem Oberjura von Saal bei Kelheim; SNSB-BSPG 2016 XX1 21 (Sammlung J. Sylla). Durchmesser 2,5 cm. Foto: M. Schellenberger. Copyright © 2017 by Verlag Dr. Friedrich Pfeil, München Dr. Friedrich Pfeil, Wolfratshauser Straße 27, 81379 München www.pfeil-verlag.de Alle Rechte vorbehalten Druckvorstufe: Verlag Dr. Friedrich Pfeil, München Druck: PBtisk a.s., Prˇíbram I – Balonka Printed in the European Union – gedruckt auf chlorfrei gebleichtem Papier – ISSN 0942-5845 – ISBN 978-3-89937-222-9 Inhalt Vereinsgremien .......................................................................................... 4 Grußwort der Sammlungsdirektion ...................................................... -
Microbialite-Dominated Fossil Associations in Cipit Boulders from Alpe Di Specie and Misurina (St. Cassian Formation, Middle to Upper Triassic, Dolomites, NE Italy)
PUBLICACIÓN CONTINUA ARTÍCULO ORIGINAL © 2019 Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza. This is an Open Access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). TIP Revista Especializada en Ciencias Químico-Biológicas, 22: 1-18, 2019. DOI: 10.22201/fesz.23958723e.2019.0.171 Microbialite-dominated fossil associations in Cipit Boulders from Alpe di Specie and Misurina (St. Cassian Formation, Middle to Upper Triassic, Dolomites, NE Italy) Francisco Sánchez-Beristain1* and Joachim Reitner2 1Museo de Paleontología, Facultad de Ciencias, Universidad Nacional Autónoma de México. Circuito Exterior S/N. Ciudad Universitaria. Coyoacán 04510. Ciudad de México, México. 2Geowissenschaftliches Zentrum der Universität Göttingen, Abt. Geobiologie, Goldschmidtstraße 3. 37077 Göttingen, Germany. E-mail: *[email protected] Abstract In this paper we describe four new fossil associations of “reef” and “reef”-like environments of the St. Cassian Formation (Ladinian-Carnian, Dolomites, NE Italy), based on thirty thin sections from 10 “Cipit boulders” olistoliths, which slided from the Cassian platform into coeval basin sediments. The fossil associations were determined by means of microfacies analysis using point-counting and visual estimation, as well as with aid of statistical methods, based on all fractions with a biotic significance (biomorpha and microbialites). Cluster Analyses in Q-Mode were performed, coupling three algorithms and two indices. In all samples, the main components of the framework are microbialite (average of 75%), and macrofossils (average of 20%), whereas cements and allochtonous components, such as allomicrite, do not represent a significant fraction. Based on both microbialite and fossil content, Chaetetid–microencruster Association, Microbialite–microencruster Association, Dual-type Microbialite Association and Microbialite–Terebella Association, were differentiated. -
How to Cite Complete Issue More Information About This Article
TIP. Revista especializada en ciencias químico-biológicas ISSN: 1405-888X ISSN: 2395-8723 Universidad Nacional Autónoma de México, Facultad de Estudios Superiores, Plantel Zaragoza Sánchez-Beristain, Francisco; Reitner, Joachim Microbialite-dominated fossil associations in Cipit Boulders from Alpe di Specie and Misurina (St. Cassian Formation, Middle to Upper Triassic, Dolomites, NE Italy) TIP. Revista especializada en ciencias químico-biológicas, vol. 22, 2019 Universidad Nacional Autónoma de México, Facultad de Estudios Superiores, Plantel Zaragoza DOI: 10.22201/fesz.23958723e.2019.0.171 Available in: http://www.redalyc.org/articulo.oa?id=43265210003 How to cite Complete issue Scientific Information System Redalyc More information about this article Network of Scientific Journals from Latin America and the Caribbean, Spain and Journal's webpage in redalyc.org Portugal Project academic non-profit, developed under the open access initiative PUBLICACIÓN CONTINUA ARTÍCULO ORIGINAL © 2019 Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza. This is an Open Access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). TIP Revista Especializada en Ciencias Químico-Biológicas, 22: 1-18, 2019. DOI: 10.22201/fesz.23958723e.2019.0.171 Microbialite-dominated fossil associations in Cipit Boulders from Alpe di Specie and Misurina (St. Cassian Formation, Middle to Upper Triassic, Dolomites, NE Italy) Francisco Sánchez-Beristain1* and Joachim Reitner2 1Museo de Paleontología, Facultad de Ciencias, Universidad Nacional Autónoma de México. Circuito Exterior S/N. Ciudad Universitaria. Coyoacán 04510. Ciudad de México, México. 2Geowissenschaftliches Zentrum der Universität Göttingen, Abt. Geobiologie, Goldschmidtstraße 3. 37077 Göttingen, Germany. E-mail: *[email protected] Abstract In this paper we describe four new fossil associations of “reef” and “reef”-like environments of the St. -
Upper Devonian) of Latvia
Estonian Journal of Earth Sciences, 2021, 70, 1, 3–17 https://doi.org/10.3176/earth.2021.01 Revision of asterolepidoid antiarch remains from the Ogre Formation (Upper Devonian) of Latvia Ervīns Lukševičs Department of Geology, University of Latvia, Raiņa Boulevard 19, Riga LV1586, Latvia; [email protected] Received 3 June 2020, accepted 8 September 2020, available online 15 December 2020 Abstract. The Frasnian (Upper Devonian) antiarch Walterilepis speciosa was first described in 1933 (as Taeniolepis) on the basis of a single specimen. The newly collected material has allowed the head to be described in a more detail, especially the nuchal and paranuchal plates. Other newly described elements include bones of the pectoral appendages and trunk armour, demonstrating a rather high and short trunk armour. The shape and proportions of the head and trunk armour suggest the attribution of Walterilepis to the family Pterichthyodidae; it is most probably closely related to Lepadolepis from the Late Frasnian of Germany. Whilst W. speciosa is endemic to the Latvian part of the Baltic Devonian Basin, the connection to the Rheinisches Schiefergebirge is probably closer than previously presumed. Walterilepis fits into the biostratigraphical column at the same level as Bothriolepis maxima and B. evaldi, indicating the high diversity of antiarchs during Pamūšis time. Key words: Frasnian, biostratigraphy, morphology, placoderm, Baltic Devonian basin. INTRODUCTION noted that the generic name of Gross (1932, 1933a) is preoccupied by the sarcopterygian name Taeniolepis The wellknown Baltic German palaeontologist Walter Trautschold, 1874, and he erected the replacement name Gross, who was born in the close vicinity of Riga, made Walterilepis (Moloshnikov 2001). -
Geologie Und Paläontologie
LWL-Museum für Naturkunde Westfälisches Landesmuseum mit Planetarium Geologie und Paläontologie Liste aller lieferbaren Hefte | Stand 16.12.2020 Geologie und Paläontologie in Westfalen Heft 53 Schallreuter, Roger: Ostrakoden aus silurischen Geschieben IV. (69 Heft 62 Skupin, Klaus; Stritzke, Rüdiger: Frühdrenthezeitliche S., 14 Taf.) Januar 2000, 978-3-924590-65-9 257 g - 14,57 € Ablagerungen im östlichen und südöstlichen Münsterland. Wiese, Frank; Kaplan, Ulrich: Der Mittel-/Ober-Turon Grenzbereich im Raum Lengerich. Heft 54 Mutterlose, Jörg; Klein, Christian; Kessels, Kai: Die Floren- und Kaplan, Ulrich: Neue Beobachtungen zu den Stromberg-Schichten, Faunenführung des Ober-Valangin (Unter-Kreide) in NW Deutschland. (95 Untercampan, Oberkreide, südöstliches Münsterland. S., 29 Abb., 23 Taf.) Januar 2000, 978-3-924590-66-6 342g - 17,90 € Schöllmann, Lothar: Archaeostomatopodea (Malacostraca, Hoplocarida) aus dem Namur B (höheres Marsdenium, Karbon) von Hagen-Vorhalle (NRW, Heft 55 Schallreuter, Roger: Ostrakoden a. silurischen Geschieben V. Deutschland) und eine Neudefinition einiger Arten der Familie Rödder, Gerhard; Ziegler, Fred-Karsten: Kloedenia saalensis n. sp., eine neue Tyrannophontidae. (141 S., 46 Abb., 2 Tab., 10 Taf.) obersilurische Ostrakodenart aus einem Beyrichienkalk-Geschiebe des November 2004, 978-3-924590-81-9 468 g - 19,90 € Münsterländer Hauptkiessandzuges. Braun, Andreas; Gosny, Olaf: Strukturbietend erhaltene Achsen von Bilignea Heft 63 Grzegorczyk, Detlef; Gumprecht, Almuth; Hendricks, Alfred; Lanser, aus Kieselschiefern des Unter-Karbons bei Wuppertal (Bergisches Land, Klaus-Peter; Schöllmann, Lothar: Anwendung des Denkmalschutzgesetzes Deutschland). (117 S., 1 Abb., 2 Tab., 23 Taf. ) von Nordrhein-Westfalen im Bereich der Paläontologie. November 2000, 978-3-924590-68-0 394 g - 18,41 € Grzegorczyk, Detlef: In die Denkmallisten eingetragene Bodendenkmäler in Westfalen-Lippe (Stand 2004). -
Westfalens Jurassic Park – Tetrapoden Aus Dem Ornatenton
plan and a highly specialised mode of locomo- en bevestigd het vermoeden dat de diversica- tion using four ippers. The discovery of the tie van de Plesiosauria in het late Trias plaats- skeleton of a Plesiosaurus at Warburg-Bonen- vond. Ze overleefden de nog slecht begrepen burg is the rst ever skeletal and thus con- massa-uitsterving aan het eind van het Trias rmed evidence dating from the Triassic peri- door hun gespecialiseerde marine levenswijze. od. Rhaeticosaurus is a basal Pliosaurus, which conrms the assumption that the diversica- Literatur tion of Plesiosauria occurred during the late Roger Benson/Mark Evans/Patrick S. Druckenmiller, Triassic. Thanks to their high-marine life form, High Diversity, Low Disparity and Small Body Size in Plesiosaurs (Reptilia, Sauropterygia) from the Triassic– Plesiosauria survived the extinction event that Jurassic Boundary. PLoS ONE 7(3), 2012, e31838. – Detlef occurred at the end of the Triassic, which is not Grzegorczyk, Ein Meeresreptil aus Warburg-Bonenburg. yet fully understood. Archäologie in Westfalen-Lippe 2014, 2015, 26–28. – Paul Martin Sander u. a., Die paläontologische Grabung AUSGRABUNGEN UND FUNDE UND FUNDE AUSGRABUNGEN Samenvatting in der Rhät-Lias-Tongrube der Fa. Lücking bei Warburg- Bonenburg (Kr. Höxter) im Frühjahr 2015. Geologie und Plesiosauria waren de meest gedifferentieerde Paläontologie in Westfalen 88, 2016, 11–37. – Tanja en succesvolste marine reptielen uit de Jura en Wintrich u. a., A Triassic Plesiosaurian Skeleton and Bone het Krijt, met een uniek ontwerp en een sterk Histology inform on Evolution of a unique Body Plan. gespecialiseerde, viervinnige wijze van voort- Sciences Advances 3, 2017, e1701144. bewegen. -
The Magnetobiostratigraphy of the Middle Triassic and the Latest Early Triassic from Spitsbergen, Arctic Norway Mark W
Intercalibration of Boreal and Tethyan time scales: the magnetobiostratigraphy of the Middle Triassic and the latest Early Triassic from Spitsbergen, Arctic Norway Mark W. Hounslow,1 Mengyu Hu,1 Atle Mørk,2,6 Wolfgang Weitschat,3 Jorunn Os Vigran,2 Vassil Karloukovski1 & Michael J. Orchard5 1 Centre for Environmental Magnetism and Palaeomagnetism, Geography, Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, UK 2 SINTEF Petroleum Research, NO-7465 Trondheim, Norway 3 Geological-Palaeontological Institute and Museum, University of Hamburg, Bundesstrasse 55, DE-20146 Hamburg, Germany 5 Geological Survey of Canada, 101-605 Robson Street, Vancouver, BC, V6B 5J3, Canada 6 Department of Geology and Mineral Resources Engineering, Norwegian University of Sciences and Technology, NO-7491 Trondheim, Norway Keywords Abstract Ammonoid biostratigraphy; Boreal; conodonts; magnetostratigraphy; Middle An integrated biomagnetostratigraphic study of the latest Early Triassic to Triassic. the upper parts of the Middle Triassic, at Milne Edwardsfjellet in central Spitsbergen, Svalbard, allows a detailed correlation of Boreal and Tethyan Correspondence biostratigraphies. The biostratigraphy consists of ammonoid and palynomorph Mark W. Hounslow, Centre for Environmental zonations, supported by conodonts, through some 234 m of succession in two Magnetism and Palaeomagnetism, adjacent sections. The magnetostratigraphy consists of 10 substantive normal— Geography, Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster, LA1 reverse polarity chrons, defined by sampling at 150 stratigraphic levels. The 4YQ, UK. E-mail: [email protected] magnetization is carried by magnetite and an unidentified magnetic sulphide, and is difficult to fully separate from a strong present-day-like magnetization. doi:10.1111/j.1751-8369.2008.00074.x The biomagnetostratigraphy from the late Olenekian (Vendomdalen Member) is supplemented by data from nearby Vikinghøgda. -
Università Degli Studi Di Milano
1 UNIVERSITÀ DEGLI STUDI DI MILANO DOTTORATO DI RICERCA IN SCIENZE DELLA TERRA Ciclo XXXII DIPARTIMENTO DI SCIENZE DELLA TERRA TESI DI DOTTORATO DI RICERCA EARLY CARNIAN AMMONOIDS FROM NEVADA: REVISED TAXONOMY, EVOLUTIONARY TRENDS AND USEFULNESS FOR THE DEFINITION OF THE LATE TRIASSIC TIME SCALE RUBEN MARCHESI Matr. n. R11510 Tutore: Prof. MARCO BALINI Coordinatore: Prof. FERNANDO CAMARA ARTIGAS Anno Accademico 2018-2019 1 2 2 3 Abstract ................................................................................................................................................ 5 Introduction to the biochronostratigraphy of the Upper Ladinian and Lower Carnian ................ 7 1.1 - Basic concepts ............................................................................................................................. 7 1.2 - Evolution of the Tethyan and North American upper Ladinian – Lower Carnian chronostratigraphic scale ...................................................................................................................... 9 1.3 - Carnian Stage GSSP and open problems ................................................................................... 12 Studied localities: geological and structural setting.......................................................................... 15 2.1 - Regional geological and structural setting ................................................................................. 15 2.2 - South Canyon............................................................................................................................ -
Documentation and Revision of the Index Ostracods from the Lower and Middle Jurassic in SW Germany According to BUCK (1954)
Palaeodiversity 2: 119–167; Stuttgart, 30.12.2009. 119 Documentation and revision of the index ostracods from the Lower and Middle Jurassic in SW Germany according to BUCK (1954) MATTHIAS FRANZ, EKATERINA TESAKOVA & ELKE BEHER Abstract The ostracods from the unpublished table by BUCK (1954) are revised and figured by SEM photographs. Two new species, Aphelocythere? asymmetrica n. sp. and Palaeocytheridea blaszykina n. sp., are described. Three manuscript names are formally established here: Neurocythere cingata n. sp. BRAUN in FRANZ et al., N. tricostata n. sp. BRAUN in FRANZ et al. and Bairdia pumicosa n. sp. SHEPPARD in FRANZ et al. The stratigraphical distribution of all species in the BUCK table in SW Germany has been modified according to literature data. K e y w o r d s : Ostracods, Lower Jurassic, Middle Jurassic, SW Germany. Kurzfassung Die Ostrakoden der unveröffentlichten Tabelle von BUCK (1954) werden revidiert und mittels REM-Aufnahmen abgebildet. Zwei neue Arten, Aphelocythere? asymmetrica n. sp. und Palaeocytheridea blaszykina n. sp., werden aufgestellt; darüberhinaus werden drei Arten, Neurocythere cingata n. sp. BRAUN in FRANZ et al. und N. tricostata n. sp. BRAUN in FRANZ et al. sowie Bairdia pumicosa n. sp. SHEPPARD in FRANZ et al. hiermit veröffentlicht. Die stratigraphischen Reichweiten der Arten der BUCK-Tabelle in SW-Deutschland wurden anhand von Literaturdaten modifiziert. Contents 1. Introduction ............................................................................ 119 2. Stratigraphy ............................................................................121 -
Pseudosonninia, a New Genus of Oppeliid Ammonite (Haploceratoidea) from the Callovian (Middle Jurassic) of the Neuquén Basin, Argentina
VOLUMINA JURASSICA, 2019, XVII: 39–48 DOI: 10.7306/VJ.17.3 Pseudosonninia, a new genus of oppeliid ammonite (Haploceratoidea) from the Callovian (Middle Jurassic) of the Neuquén Basin, Argentina Horacio PARENT1, Alberto C. GARRIDO2, Günter SCHWEIGERT3, Luciano BRAMBILLA4 Key words: ammonites, Callovian, Los Molles Fm., Chacay Melehué, Argentina. Abstract. From the uppermost part of the Los Molles Formation (upper Lower and lower Middle Callovian) in Chacay Melehué (Neu- quén Province, Argentina), a group of hecticoceratine ammonites with a conspicuous morphology not assimilable to any known genus of this subfamily has been recently discovered. These forms are inflated oxycones with a prominent, sharp keel developed from the juvenile phragmocone up to the adult peristome. The new genus Pseudosonninia is established on the basis of these ammonites, with Pseudoson- ninia chacaymelehuensis n. gen. n. sp. as its type species. The new genus seems to be endemic to the Neuquén Basin and is recorded here from the upper Lower and lower Middle Callovian of Chacay Melehué and Río de Los Patos. INTRODUCTION zons of the Lower Callovian Bodenbenderi and Proximum zones, as well as from the highest levels of the Los Molles The Lower-Middle Callovian oppeliids from the upper Fm., a few meters below the Tábanos Fm., which are situated part of the Los Molles Fm. are poorly known throughout the above the Proximum Zone. Among these ammonites there Neuquén Basin (Fig. 1A). Besides several papers mention- are hecticoceratine morphotypes mostly belonging to Hecti- ing different species (e.g. Keidel, 1910; Groeber, 1918, coceras Bonarelli, 1893, but others correspond to an unde- Groeber et al., 1953; Stipanicic, 1965; Westermann, 1967; scribed genus. -
Terra Nostra 2018, 1; Mte13
IMPRINT TERRA NOSTRA – Schriften der GeoUnion Alfred-Wegener-Stiftung Publisher Verlag GeoUnion Alfred-Wegener-Stiftung c/o Universität Potsdam, Institut für Erd- und Umweltwissenschaften Karl-Liebknecht-Str. 24-25, Haus 27, 14476 Potsdam, Germany Tel.: +49 (0)331-977-5789, Fax: +49 (0)331-977-5700 E-Mail: [email protected] Editorial office Dr. Christof Ellger Schriftleitung GeoUnion Alfred-Wegener-Stiftung c/o Universität Potsdam, Institut für Erd- und Umweltwissenschaften Karl-Liebknecht-Str. 24-25, Haus 27, 14476 Potsdam, Germany Tel.: +49 (0)331-977-5789, Fax: +49 (0)331-977-5700 E-Mail: [email protected] Vol. 2018/1 13th Symposium on Mesozoic Terrestrial Ecosystems and Biota (MTE13) Heft 2018/1 Abstracts Editors Thomas Martin, Rico Schellhorn & Julia A. Schultz Herausgeber Steinmann-Institut für Geologie, Mineralogie und Paläontologie Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 8, 53115 Bonn, Germany Editorial staff Rico Schellhorn & Julia A. Schultz Redaktion Steinmann-Institut für Geologie, Mineralogie und Paläontologie Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 8, 53115 Bonn, Germany Printed by www.viaprinto.de Druck Copyright and responsibility for the scientific content of the contributions lie with the authors. Copyright und Verantwortung für den wissenschaftlichen Inhalt der Beiträge liegen bei den Autoren. ISSN 0946-8978 GeoUnion Alfred-Wegener-Stiftung – Potsdam, Juni 2018 MTE13 13th Symposium on Mesozoic Terrestrial Ecosystems and Biota Rheinische Friedrich-Wilhelms-Universität Bonn,