DOCSLIB.ORG

Preliminary Ammonite Zonation for the Lower Cretaceous of the Medtterranean Region

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Preliminary Ammonite Zonation for the Lower Cretaceous of the Medtterranean Region 123 Géologie alpine, t.66, 1990 PRELIMINARY AMMONITE ZONATION FOR THE LOWER CRETACEOUS OF THE MEDTTERRANEAN REGION Lower Cretaceous Cephalopod Team Working Group of IGCP Project 262 Report by Philip J. Hoedemaeker (1) and Luc Bulot (2) PARTICIPANTS E. Avram (Univ. Bucarest, Roumania) R. Busnardo (Univ. Lyon, France) M. Company (Univ. Granada, Spain) G. Delanoy (Mus. Nat. Hist. and Univ. Nice, France) M* Kakabadze (Georgia SSR Academy of Sciences, Tbilisi, USSR) E. Kotetishvilli (Georgia SSR Academy of Sciences, Tbilisi, USSR) J. Krishna (Univ. Benares, India) I. Kvantaliani (Georgia SSR Academy of Sciences, Tbilisi, USSR), J.L. Latil (EPHE, Dijon, France) L. Memmi (Tunisian Geol. Survey, Tunis, Tunisia) P.F. Rawson (Univ. Collège London, Great Britain) J. Sandoval (Univ. Granada, Spain) J.M. Tavera (Univ. Granada, Spain) J.P. Thieuloy (Univ. Grenoble, France) G. Thomel (Mus. Nat. Hist. and Univ. Nice, France) Z. Vasicek (Univ. Ostrava, Czechoslovakia) J. Vermeulen (Univ. Nice, France). RESUME Ce rapport préliminaire correspond à la synthèse des discussions de la réunion de travail du Working Group Céphalopodes du Crétacé inférieur du PICG 262 : Corrélations du Crétacé de la Téthys. Il se compose d'une proposition de schéma zonal pour la province méditerranéenne et de notes explicatives sur le choix des espèces-index de certaines unités biostratigraphiques. ABSTRACT This preliminary report is the synthesis of the discussions held during the workshop of the Lower Cretaceous Working group of IGCP 262 : Tethyan Cretaceous Corrélation. It présents a proposition of zonal scheme for the mediterranean province and justifications about the choice of the index-species for some biostratigraphical units. (1) National Muséum of Naturel History, Leiden, THE NETHERLANDS (2) Réserve Géologique de Haute-Provence, Digne, FRANCE et I. S. T., Université de Bourgogne, 6, Bd Gabriel, 21100 Dijon, FRANCE 124 I. INTRODUCTION 1) Berriasella jacobi has been preferred as index species of the first Berriasian zone, because this species appears at the base of this zone, whereas The Lower Cretaceous Cephalopod Working Pseudosubplaniteseuxinus probably appears at a higher Group of the IGCP-Project 262: Tethyan Cretaceous level. Corrélation, organized a workshop with the aim to provide the participants of the project with a standard 2) Notwithstanding that Pseudosubplanites grandis ammonite zonation for the Lower Cretaceous of the appears low in the Berriasella jacobi Subzone, it is still Mediterranean région. possible to recognize a distinct ammonite association in the upper part of the Berriasella jacobi Zone for This workshop was held at the Reserve which no index species could be appointed yet. P. géologique de Haute-Provence (Alpes de Haute- grandis is provisionally retained as the name for this Provence, Digne) on the 1 lth to 15th of July, 1990. Only subzone. the prelimilary results of this meeting are published hère. Detailed logs and full description of faunas will be 3) In order to avoid confusion it should be noted that the published in a separate volume, which will appear in Fauriella boissieri Zone does not correspond to the 1992. original conception by KILIAN (1888) and the "COLLOQUE SUR LE CRETACE INFERIEUR" The Working Group did not discuss stage (196S). The définition of this zone has been modifled boundaries. Only the IUGS Subcommission on so as to correspond to the first appearance of Cretaceous Stratigraphy has the authority to formulate Fauriella boissieri as proposed by LE HEGARAT proposais on this matter. (1971). It was agreed upon that in principle zones 4) Most of LE HEGERAT's (1971) subzones of the should be defined by the first appearance of its index middle and late Berriasian hâve been maintained spedes. For the sake of stability in stratigraphie notwithstanding that they are not defined by the first nomenclature a few exceptions on this principle were appearance of the index species. It was considered wise allowed. In addition a diagnostic association of to préserve stability in stratigraphie nomenclature. ammonite species should be indicated, by which the zone The Berriasella callisto Subzone has however been can be recognized if the index species is rare or not found. rejected by the Working Group and incorporated in the Berriasella picteti Subzone, because its ammonite It was also agreed upon that zones should be accepted association is not more than an impoverished only if described in littérature with sufficient détail, Berriasella picteti association. The species Berriasella as to allow récognition outside the area in which it was callisto already appears in the Paramimouna Subzone. firstly described. The only exception allowed was the zones of lower and lower upper Barremian, on the 5) HOEDEMAEKER (1982) recognized in the section condition that a detailed description has to be published of Los Miravetes (Caravaca, SE Spain) a distinct in that separate volume to be published in 1992. ammonite association between the associations of the former Callisto Subzone and the Thurmanniceras Finally it was considered wise not to change the otopeta Zone. He called it Tirnovella alpillensis current zonation too drasticaUy and to préserve Subzone. The depositional Transgressive System Tract, stability in stratigraphie nomenclature as much as Highstand System Tract and Lowstand System Tract possible. The Working Group reached consensus upon that contain this ammonite association hâve been the following standard zonal scheme for the Mediterranean région. indicated in SE France, but generaUy lack ammonites. As Tirnovella alpillensis already appears in the Picteti Subzone, another index species has to be chosen in the H. ZONAL SCHEME future. The biostratigraphic interval, which will remain un-named until a new index species could be indicated, Table on separate page. is characterized by the first appearance of ammonite species, hitherto considered characteristic for the Valanginian. However, the Working Group UL EXPLANATIONS recommended to leave this association provisionnally in the F. boissieri Zone until full description of the fauna. 125 ZOrtES SUBZONES HORIZONS S. (S.) dispar S. (S.) dispar (20) S. (F.) blancheti M. inflatum E. lautus 1 E. loricatus H. spathi (19) S H. dentatus •i L. Ivelli (19) D. mammillatum s L. tardefurcata H. jacobi A. nolani D. nodosocostatum s C. tobleri Q < a s E. subnodosocostatum s D. furcata P. deshayesi D. weissi S P. tuarkyricus T. turkmenicum (16) C. securiformis (15) Z I. giraudi (14) < H. feraudianus S. sartousiana (13) A. vandenheckei (13) P5 H. caillaudi N. pulchella S. nicklesi (12) S. hugii P. angulicostata auct. (11) B. balearis un-named association (10) 5: S. sayni s C. cruasense (9) L. nodosoplicatum L. nodosoplicatum <).(J.)jeannoti(8) o C. loryi C. loryi (8) A. radiatus N. (T.) caUidiscus Z H. trinodosum C. farcillata (7) < O. (O.) nicklesi (7) S S. verrucosum (6) z B. campylotoxus < T. pertransiens < o > T. otopeta un-named association (5) F. boissieri (3) Z B. picteti < M. paramimouna < D. dalmasi S -a (4) ce o T. occitanica B. privasensis S T. subalpina P. grandis ? (2) B. jacobi (1) o B. jacobi 126 6) It should be noted that the Saynoceras verrucosum Both of them will be defined in the 1992 volume. Zone does not correspond to the original conception by LORY (1898) and the "COLLOQUE SUR LE 14) Imerites giraudi was prefered by the Working Group CRETACE INFERIEUR" (1965). The définition of as a zonal name above Heteroceras astieri because the this zone has been modified to correspond to the first true identity of H. astieri is still poorly known and appearance of S. verrucosum as defined by because /. giraudi has a short range and a wide MOULLADE and THIEULOY (1967). géographie distribution. The base of the zone can be recognized by the first appearance of Imerites and 7) Within the Himantoceras trinodosum Zone two Eristavia. horizons could be distinguished (THIEULOY, FUHR and BULOT, in press): a lower one with Olcostephanus 15) Although Colchidites securifornis has not been (Olcostephanus) nicklesi (= senior synonym of 0. (O.) recorded from the Barremian type-area, this well sanctifirminensis ) and an upper one with known name was preserved as a zonal name. The Criosarasinella furcillata . Only after wider Colchidites from the upper part of the stratotype hâve yet géographie récognition they might become subzones. not been identified to the species level, but in other sections of the Angles-Barreme area, Colchidites of the 8) In SE France the Crioceratites loryi Zone could be sarasini group was found in the uppermost Barremian. divided in two horizons: a lower Crioceratites loryi This group also occurs in the ammonite assemblage of horizon and an upper Olcostephanus (Jeannoticeras) the C. securiformis Zone in Georgia. jeannoti horizon. Detailed sections will be published in the 1992 volume. Only after wider géographie 16) Because of it's restricted géographie distribution, récognition they might become subzones. the Turkmeniceras turkmenicum Zone of Soviet workers is recommended by the Working Group to be 9) Cruasiceras cruasense Zone has hitherto only been used as a horizon. recognized in SE France, where it characterized the beds between the last Lyticoceras nodosoplicatum and the 17) For the Aptian, the zonation developed in Georgia first Subsaynella sayni . Awaiting its récognition in has been adopted because it has been proved to be other parts of the Mediterranean, it is hère workable. A detailed zonation of the French Aptian is considered a subzone of the Lyticoceras still not avalaible. nodosoplicatum Zone. 18) A threefold division of the Aptian is maintained. 10) This association correspond to the Plesiospitidiscus It remained unsolved whether the Dufrenoya furcata ligatus Zone formerly introduced by Moullade and Zone should mark the base of the Middle Aptian or the Thieuloy (1967). Since, 'true" P. ligatus hâve been top of the Lower Aptian. proved to occur in the S. sayni Zone, the spitidiscids formerly referred to this species await full re vision by 19) The Albian zones developed by SPATH and Thieuloy and the association remains un-named.
Load more

Recommended publications
  • New and Poorly Known Perisphinctoidea (Ammonitina) from the Upper Tithonian of Le Chouet (Drôme, SE France)
    Volumina Jurassica, 2014, Xii (1): 113–128 New and poorly known Perisphinctoidea (Ammonitina) from the Upper Tithonian of Le Chouet (Drôme, SE France) Luc G. BULOT1, Camille FRAU2, William A.P. WIMBLEDON3 Key words: Ammonoidea, Ataxioceratidae, Himalayitidae, Neocomitidae, Upper Tithonian, Le Chouet, South-East France. Abstract. The aim of this paper is to document the ammonite fauna of the upper part of the Late Tithonian collected at the key section of Le Chouet (Drôme, SE France). Emphasis is laid on new and poorly known Ataxioceratidae, Himalayitidae and Neocomitidae from the upper part of the Tithonian. Among the Ataxioceratidae, a new account on the taxonomy and relationship between Paraulacosphinctes Schindewolf and Moravisphinctes Tavera is presented. Regarding the Himalayitidae, the range and content of Micracanthoceras Spath is discussed and two new genera are introduced: Ardesciella gen. nov., for a group of Mediterranean ammonites that is homoeomorphic with the Andean genus Corongoceras Spath, and Pratumidiscus gen. nov. for a specimen that shows morphological similarities with the Boreal genera Riasanites Spath and Riasanella Mitta. Finally, the occurrence of Neocomitidae in the uppermost Tithonian is documented by the presence of the reputedly Berriasian genera Busnardoiceras Tavera and Pseudargentiniceras Spath. INTRODUCTION known Perisphinctoidea from the Upper Tithonian of this reference section. Additional data on the Himalayitidae in- The unique character of the ammonite fauna of Le Chouet cluding the description and discussion of Boughdiriella (near Les Près, Drôme, France) (Fig. 1) has already been chouetensis gen. nov. sp. nov. are to be published elsewhere outlined by Le Hégarat (1973), but, so far, only a handful of (Frau et al., 2014).
    [Show full text]
  • Upper Jurassicelower Cretaceous Stratigraphy in South-Eastern Tibet: a Comparison with the Western Himalayas
    Author's personal copy Cretaceous Research 29 (2008) 301e315 www.elsevier.com/locate/CretRes Upper JurassiceLower Cretaceous stratigraphy in south-eastern Tibet: a comparison with the western Himalayas Xiumian Hu a,*, Luba Jansa b, Chengshan Wang c a State Key Laboratory of Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China b Department of Earth Sciences, Dalhousie University, Halifax B3H 3J5, Canada c Geological Centre for Tibetan Plateau, China University of Geosciences, Beijing 100083, P.R. China Received 24 January 2007; accepted in revised form 14 May 2007 Available online 28 November 2007 Abstract Lithostratigraphic studies of the Upper JurassiceLower Cretaceous sedimentary successions exposed in the TingrieGyangze area, south- eastern Tibet resulted in the establishment of a revised stratigraphic framework. A major crustal fault separates the southern Tibetan sedimentary successions into a Southern Zone and a Northern Zone. The Upper JurassiceLower Cretaceous strata of the Southern Zone are subdivided into the Menkadun Formation (Oxfordian, Kimmeridgian, up to lower Upper Tithonian), the Gucuo Formation (Upper Tithonian to Lower Albian) and the overlying Dongshan Formation (Upper Albian). The Gucuo Formation is further subdivided into a quartz arenite unit, which is overlain by a shale unit, in turn overlain by a volcaniclastic sandstone unit. The youngest cluster of detrital zircon absolute age data (127.7 Æ 1.8 Ma) from the lower part of the volcaniclastic unit of the Gucuo Formation place the volcanic event before the Late Barremian. In the Northern Zone, the Upper JurassiceLower Cretaceous strata have been subdivided into four formations: the Zhera Formation (Upper Jurassic), the Weimei Formation (Tithonian), the Rilang Formation (?Berriasian) and the Gyabula Formation (? post-Valanginian).
    [Show full text]
  • Abelisaurus Comahuensis 321 Acanthodiscus Sp. 60, 64
    Index Page numbers in italic denote figure. Page numbers in bold denote tables. Abelisaurus comahuensis 321 structure 45-50 Acanthodiscus sp. 60, 64 Andean Fold and Thrust Belt 37-53 Acantholissonia gerthi 61 tectonic evolution 50-53 aeolian facies tectonic framework 39 Huitrin Formation 145, 151-152, 157 Andes, Neuqu6n 2, 3, 5, 6 Troncoso Member 163-164, 167, 168 morphostructural units 38 aeolian systems, flooded 168, 169, 170, 172, stratigraphy 40 174-182 tectonic evolution, 15-32, 37-39, 51 Aeolosaurus 318 interaction with Neuqu6n Basin 29-30 Aetostreon 200, 305 Andes, topography 37 Afropollis 76 Andesaurus delgadoi 318, 320 Agrio Fold and Thrust Belt 3, 16, 18, 29, 30 andesite 21, 23, 26, 42, 44 development 41 anoxia see dysoxia-anoxia stratigraphy 39-40, 40, 42 Aphrodina 199 structure 39, 42-44, 47 Aphrodina quintucoensis 302 uplift Late Cretaceous 43-44 Aptea notialis 75 Agrio Formation Araucariacites australis 74, 75, 76 ammonite biostratigraphy 58, 61, 63, 65, 66, Araucarioxylon 95,273-276 67 arc morphostructural units 38 bedding cycles 232, 234-247 Arenicolites 193, 196 calcareous nannofossil biostratigraphy 68, 71, Argentiniceras noduliferum 62 72 biozone 58, 61 highstand systems tract 154 Asteriacites 90, 91,270 lithofacies 295,296, 297, 298-302 Asterosoma 86 92 marine facies 142-143, 144, 153 Auca Mahuida volcano 25, 30 organic facies 251-263 Aucasaurus garridoi 321 palaeoecology 310, 311,312 Auquilco evaporites 42 palaeoenvironment 309- 310, 311, Avil6 Member 141,253, 298 312-313 ammonites 66 palynomorph biostratigraphy 74,
    [Show full text]
  • Remarks on the Tithonian–Berriasian Ammonite Biostratigraphy of West Central Argentina
    Volumina Jurassica, 2015, Xiii (2): 23–52 DOI: 10.5604/17313708 .1185692 Remarks on the Tithonian–Berriasian ammonite biostratigraphy of west central Argentina Alberto C. RICCARDI 1 Key words: Tithonian–Berriasian, ammonites, west central Argentina, calpionellids, nannofossils, radiolarians, geochronology. Abstract. Status and correlation of Andean ammonite biozones are reviewed. Available calpionellid, nannofossil, and radiolarian data, as well as radioisotopic ages, are also considered, especially when directly related to ammonite zones. There is no attempt to deal with the definition of the Jurassic–Cretaceous limit. Correlation of the V. mendozanum Zone with the Semiforme Zone is ratified, but it is open to question if its lower part should be correlated with the upper part of the Darwini Zone. The Pseudolissoceras zitteli Zone is characterized by an assemblage also recorded from Mexico, Cuba and the Betic Ranges of Spain, indicative of the Semiforme–Fallauxi standard zones. The Aulacosphinctes proximus Zone, which is correlated with the Ponti Standard Zone, appears to be closely related to the overlying Wind­ hauseniceras internispinosum Zone, although its biostratigraphic status needs to be reconsidered. On the basis of ammonites, radiolarians and calpionellids the Windhauseniceras internispinosum Assemblage Zone is approximately equivalent to the Suarites bituberculatum Zone of Mexico, the Paralytohoplites caribbeanus Zone of Cuba and the Simplisphinctes/Microcanthum Zone of the Standard Zonation. The C. alternans Zone could be correlated with the uppermost Microcanthum and “Durangites” zones, although in west central Argentina it could be mostly restricted to levels equivalent to the “Durangites Zone”. The Substeueroceras koeneni Zone ranges into the Occitanica Zone, Subalpina and Privasensis subzones, the A.
    [Show full text]
  • Cuesta Del Cura Limestone
    BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA VOL. 49, PP. 1651-1694. 7 PLS., 6 FIGS. NOVEM BER 1, 1938 STUDIES OF THE MEXICAN GEOSYNCLINE BY EALPH W. IMLAY CONTENTS Page Abstract....................................................................................................................................... 1652 Introduction............................................................................................................................... 1652 Acknowledgments..................................................................................................................... 1654 Earlier investigations............................................................................................................... 1654 Geography................................................................................................................................... 1654 Topography and drainage.............................................................................................. 1654 Culture................................................................................................................................ 1655 Sedimentary rocks..................................................................................................................... 1657 General discussion.......................................................................................................... 1657 Jurassic system................................................................................................................. 1657 Zuloaga
    [Show full text]
  • Secuencias Estratigráficas Del Berriasiano-Aptiano En La Cuenca De Sabinas: Su Significado En El Entendimiento De La Evolución Geológica Del Noreste Mexicano
    BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA OLUMEN NÚM P V 63, . 2, 2011, . 285-311 D GEOL DA Ó E G I I C C O A S 1904 M 2004 . C EX . ICANA A C i e n A ñ o s Secuencias estratigráficas del Berriasiano-Aptiano en la Cuenca de Sabinas: su significado en el entendimiento de la evolución geológica del noreste mexicano Samuel Eguiluz de Antuñano Geólogo consultor. 197 Slade Lane, Manchester, M19 2AE, Reino Unido Dirección actual: Coordinación de vinculación, Instituto de Geología, Ciudad Universitaria, 04510 Coyoacán, México, D.F. [email protected] Resumen En la Cuenca de Sabinas, la sucesión de capas depositadas durante el Berriasiano-Aptiano no fue continua; se identifican tres discordancias mayores como límites de secuencia de segundo orden, situadas en el Berriasiano, en el Hauteriviano y en el Aptiano. Entre cada una de estas discordancias se reconocen tractos transgresivos, regresivos y etapas de inundación. En varias partes del noreste de México hay características estratigráficas que pueden correlacionarse en posición estratigráfica y en edad con las secuencias de la Cuenca de Sabinas. Con base en su posición estratigráfica, se propone que los límites de secuencia e intervalos de máxima inundación identificados en el noreste de México pueden correlacionarse con cambios relativos del nivel marino de escala global propuestos en otros trabajos, sin desconocer que la tectónica local está presente, pero posiblemente subordinada. Palabras clave: secuencias estratigráficas, Cretácico Inferior, Cuenca de Sabinas, México. Abstract Berriasian-Aptian stratigraphic sections of the Sabinas Basin, northeast Mexico, show three major unconformities as second order sequence boundaries.
    [Show full text]
  • Tithonian–Early Valanginian Evolution of Deposition Along the Proto-Caribbean Margin of North America Recorded in Guaniguanico Successions (Western Cuba)
    Journal of South American Earth Sciences 29 (2010) 225–253 Contents lists available at ScienceDirect Journal of South American Earth Sciences journal homepage: www.elsevier.com/locate/jsames Tithonian–Early Valanginian evolution of deposition along the proto-Caribbean margin of North America recorded in Guaniguanico successions (western Cuba) Andrzej Pszczółkowski *, Ryszard Myczyn´ ski 1 Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51/55, 00-818 Warszawa, Poland article info abstract Article history: In the Guaniguanico Mountains of western Cuba, the Late Jurassic–Early Cretaceous limestones occur in Received 7 March 2008 three stratigraphic successions, which have accumulated along the proto-Caribbean margin of North Accepted 17 July 2009 America. The Late Jurassic subsidence and shallow-water carbonate deposition of the Guaniguanico suc- cessions have no counterpart on the northeastern Maya block, but some distant similarities with the southeastern Gulf of Mexico may exist. Four facies types have been distinguished in the Tithonian–Lower Keywords: Valanginian deposits of the Guaniguanico tectonic units. Drowning of the Late Jurassic carbonate bank of Cuba the Sierra de los Organos occurred at the Kimmeridgian/Tithonian boundary. During this boundary inter- Guaniguanico successions val, sedimentation in the west Cuban area and southwestern margin of the Maya block (Mexico) has North America margin Maya block evolved in a similar way in response to a major second-order transgression. Tithonian The Lower Tithonian ammonite assemblages of the Guaniguanico successions indicate, in general, the Berriasian neritic zone. Presence of juvenile gastropods and lack of adult specimens suggest unfavorable environ- Lower Valanginian ment for these molluscs, probably related to low oxygenation levels.
    [Show full text]
  • Reconsideration of the Stratigraphic Position of the Boundary Between
    ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Zitteliana - Abhandlungen der Bayerischen Staatssammlung für Paläontologie und Histor. Geologie Jahr/Year: 1982 Band/Volume: 10 Autor(en)/Author(s): Hoedemaeker Philip J. Artikel/Article: Reconsideration of the stratigraphic position of the boundary between the Berriasian and the Nemausian (= Valanginian sensu stricto) 447- 457 © Biodiversity Heritage Library, http://www.biodiversitylibrary.org/; www.zobodat.at 447 Zitteliana 10 447-457 München, 1. Juli 19S3 ISSN 0373-9627 Reconsideration of the stratigraphic position of the boundary between the Berriasian and the Nemausian (= Valanginian sensu stricto) By PHILIP J. HOEDEMAEKER*) With 3 text figures ABSTRACT The study of the ammonite distribution in the Lower Cre­ to correlate this level outside the Mediterranean faunal pro­ taceous beds N and NW of Los Miravetes (Rio Argos, W of vince. Caravaca, SE Spain), compels us to draw the boundary bet­ The transformation from a pure Berriasian ammonite asso­ ween the Berriasian and Valanginian sensu stricto between the ciation into a clear Valanginian association definitely has not Berriasella (Berriasella) picteti Subzone and the Tirnovella the abruptness that invited so many stratigraphers to choose alpillensis Subzone. The latter subzone was introduced as a this boundary as the one between the Jurassic and Cretaceous substitute for the Berriasella (Berriasella) calhsto Subzone of systems. L e H égarat (1971), because, although both subzones em­ Finally arguments are adduced to return to the old concept brace the same biochronologic interval, the ammonite asso­ of the Valanginian Stage and to regard the Berriasian as its lo­ ciations of the two differ fundamentally: in addition to the wer substage.
    [Show full text]
  • A Comparison of the Ammonite Faunas of the Antarctic Peninsula and Magallanes Basin
    J. geol. Soc. London, Vol. 139, 1982, pp. 763-770, 1 fig, 1 table. Printed in Northern Ireland A comparison of the ammonite faunas of the Antarctic Peninsula and Magallanes Basin M. R. A. Thomson SUMMARY: Ammonite-bearingJurassic and Cretaceous sedimentary successions are well developed in the Antarctic Peninsula and the Magallanes Basin of Patagonia. Faunas of middle Jurassic-late Cretaceous age are present in Antarctica but those of Patagonia range no earlier than late Jurassic. Although the late Jurassic perisphinctid-dominated faunas of the Antarctic Peninsulashow wide-ranging Gondwana affinities, it is not yet possible to effect a close comparison with faunas of similar age in Patagonia because of the latter's poor preservation and our scant knowledge of them. In both regions the Neocomian is not well represented in the ammonite record, although uninterrupted sedimentary successions appear to be present. Lack of correspondence between the Aptian and Albian faunas of Alexander I. and Patagonia may be due to major differences in palaeogeographical setting. Cenomanian-Coniacian ammonite faunas are known only from Patagonia, although bivalve faunas indicate that rocks of this age are present in Antarctica. Kossmaticeratid faunas mark the late Cretaceous in both regions. In Antarcticathese have been classified as Campanian, whereas in Patagonia it is generally accepted, perhaps incorrectly, that these also range into the Maestrichtian. Fossiliferous Jurassic and Cretaceous marine rocks are rize first those of the Antarctic Peninsula and then to well developedin theAntarctic Peninsula, Scotia compare them with those of Patagonia. Comparisons Ridge andPatagonia (Fig. 1A).In Antarcticathese between Antarctic ammonite faunas and other Gond- rocks are distributed along the western and eastern wana areas wereoutlined by Thomson (1981a), and margins of theAntarctic Peninsula, formerly the the faunas of the marginal basin were discussed in magmatic arc from which the sediments were derived.
    [Show full text]
  • A New Species of Andiceras Krantz (Cephalopoda: Ammonoidea) from the Late Jurassic-Early Cretaceous of the Neuquén Basin, Mendoza, Argentina
    Andean Geology 39 (1): 92-105. January, 2012 Andean Geology formerly Revista Geológica de Chile www.andeangeology.cl A new species of Andiceras Krantz (Cephalopoda: Ammonoidea) from the Late Jurassic-Early Cretaceous of the Neuquén Basin, Mendoza, Argentina. Systematics and Biostratigraphy Verónica V. Vennari1; Pamela P. Álvarez2; Beatriz Aguirre-Urreta1 1 Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EGA Buenos Aires; Consejo Nacional de In- vestigaciones Científicas y Técnicas (CONICET). [email protected]; [email protected] 2 Tehema, Consultores Geológicos EIRL, Virginia Subercaseaux 4100, Pirque, Santiago, Chile. [email protected] ABSTRACT. A new ammonoid species of the Andean endemic genus Andiceras Krantz is here described from upper Tithonian-lower Berriasian levels of the Vaca Muerta and Chachao Formations of the Mendoza Group, in north-western Mendoza Province, Argentina. Andiceras planulatus sp. nov. lies between the last beds with representatives of the Substeueroceras koeneni Assemblage Zone of late Tithonian age and the first bed yielding elements of the Argentini- ceras noduliferum Assemblage Zone of early Berriasian age, according to the traditional Andean ammonoid zonation scheme. The particular stratigraphic position of Andiceras planulatus, together with its easily recognizable morphology makes this species a good potential biostratigraphic marker for the Jurassic-Cretaceous boundary in the Andean region. Keywords: Ammonoidea, Andiceras, Tithonian, Berriasian, Neuquén Basin, Vaca Muerta Formation, Chachao Formation, Argentina. RESUMEN. Una nueva especie de Andiceras Krantz (Cephalopoda: Ammonoidea) del Jurásico Tardío-Cretácico Temprano de la Cuenca Neuquina, Mendoza, Argentina.
    [Show full text]
  • The Upper Jurassic of Europe: Its Subdivision and Correlation
    The Upper Jurassic of Europe: its subdivision and correlation Arnold Zeiss In the last 40 years, the stratigraphy of the Upper Jurassic of Europe has received much atten- tion and considerable revision; much of the impetus behind this endeavour has stemmed from the work of the International Subcommission on Jurassic Stratigraphy. The Upper Jurassic Series consists of three stages, the Oxfordian, Kimmeridgian and Tithonian which are further subdivided into substages, zones and subzones, primarily on the basis of ammonites. Regional variations between the Mediterranean, Submediterranean and Subboreal provinces are discussed and correlation possibilities indicated. The durations of the Oxfordian, Kimmeridgian and Tithonian Stages are reported to have been 5.3, 3.4 and 6.5 Ma, respectively. This review of the present status of Upper Jurassic stratigraphy aids identification of a num- ber of problems of subdivision and definition of Upper Jurassic stages; in particular these include correlation of the base of the Kimmeridgian and the top of the Tithonian between Submediterranean and Subboreal Europe. Although still primarily based on ammonite stratigraphy, subdivision of the Upper Jurassic is increasingly being refined by the incorporation of other fossil groups; these include both megafossils, such as aptychi, belemnites, bivalves, gastropods, brachiopods, echino- derms, corals, sponges and vertebrates, and microfossils such as foraminifera, radiolaria, ciliata, ostracodes, dinoflagellates, calcareous nannofossils, charophyaceae, dasycladaceae, spores and pollen. Important future developments will depend on the detailed integration of these disparate biostratigraphic data and their precise combination with the abundant new data from sequence stratigraphy, utilising the high degree of stratigraphic resolution offered by certain groups of fos- sils.
    [Show full text]
  • Download This PDF File
    Acta Geologica Polonica, Vol. 66 (2016), No. 2, pp. 175–204 DOI: 10.1515/agp-2016-0008 Systematic palaeontology of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France), and its implications for biostratigraphy CAMILLE FRAU1, LUC G. BULOT2, WILLIAM A.P. WIMBLEDON3 and CHRISTINA IFRIM4 1Groupement d’Intérêt Paléontologique, Science et Exposition, 60 bd Georges Richard, 83000 Toulon, France. E-mail: [email protected] 2UM 34 Aix-Marseille Université ; CNRS (UMR 7330) ; IRD (UMR 161), Centre Saint-Charles, Case 67, 3 Place Victor Hugo, 13331 Marseille Cedex 03, France. E-mail: [email protected] 3School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, United Kingdom. E-mail: [email protected] 4Institut für Geowissenschaften, Ruprecht-Karls-Universität, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany. E-mail: [email protected] ABSTRACT: Frau, C., Bulot, L.G., Wimbledon, W.A.P. and Ifrim, C. 2016. Systematic palaeontology of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France), and its implications for biostratigraphy Acta Geologica Polonica, 66 (2), 175–204. Warszawa. This study describes ammonite taxa of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France). Emphasis is placed on new and poorly known Himalayitidae, Neocomitidae and Olcostephanidae from the lower part of the Jacobi Zone auctorum. Significant results relate the introduction of Lopeziceras gen. nov., grouping himalayitid-like forms with two rows of tubercles, and Praedalmasiceras gen. nov., grouping the early Berri- asian Dalmasiceras taxa. Study of the ontogenetic sequences of both genera show that they were derived from late Tithonian Himalayitidae.
    [Show full text]