Revision of the ammonite index species Berriasella jacobi Mazenot, 1939 and its consequences for the biostratigraphy of the Berriasian Stage |
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| Institution: | 1. Groupement d''Intérêt Paléontologique, Science et Exposition, 60 bd Georges Richard, 83000 Toulon, France;2. UM 34 Aix–Marseille Université – CNRS (UMR 7330) – IRD (UMR 161), Centre Saint–Charles, Case 67, 3 Place Victor Hugo, 13331 Marseille Cedex 03, France;3. Department of Geology and Palaeontology, Faculty of Natural Sciences, Comenius University, Mlynska dolina, Ilkovičova 6, SK–84215 Bratislava, Slovak Republic;4. School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, United Kingdom;5. Institut für Geowissenschaften, Ruprecht–Karls–Universität, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, People''s Republic of China;2. Lebanese University, Faculty of Sciences II, Department of Biology, Fanar Matn P.O. Box 26110217, Lebanon;3. Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205, CNRS, MNHN, UPMC, EPHE, Muséum national d''Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005 Paris, France;1. Museum of Natural History, University of Wrocław, Sienkiewicza 21, 50-335, Wrocław, Poland;2. Schmalhausen Institute of Zoology, National Academy of Sciences of Ukraine, Bogdana Khmel''nitskogo 15, Kiev, 01601, Ukraine;1. Department of Mathematics, St. Joseph’s College Devagiri, Devagiri College P.O. - 673008 Calicut, Kerala, India;2. Department of Mathematics, St. Thomas College Palai, Arunapuram P.O. - 686574 Kottayam, Kerala, India;1. Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205, CNRS, MNHN, UPMC, EPHE, Muséum national d''Histoire naturelle, Sorbonne Universités, 57 Rue Cuvier, CP 50, Entomologie, F-75005, Paris, France;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, PR China |
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| Abstract: | Berriasella jacobi is a key ammonite taxon that has been widely used for the definition of the Tithonian/Berriasian boundary and has been widely quoted in the literature as the index species for the lowest zone of the Berriasian Stage. The taxonomic revision of B. jacobi shows that it should be excluded from the genus Berriasella and transferred to the genus Strambergella. Analysis of the literature has convinced us that most specimens illustrated as B. jacobi have been misidentified. New collection at Le Font de Saint Bertrand (Les Combes, Glandage, Drôme, France) shows us the type series corresponds to the microconch form of a dimorphic pair. New integrated data on its stratigraphic distribution causes us to question its value as an index species for the base of the Berriasian. |
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| Keywords: | Berriasian Calpionellids Ammonite biostratigraphy Ardèche France |
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