GRIESBACHIAN AND DIENERIAN (EARLY TRIASSIC) AMMONOID FAUNAS FROM NORTHWESTERN GUANGXI AND SOUTHERN GUIZHOU (SOUTH CHINA) |
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| Authors: | THOMAS BRÜHWILER ARNAUD BRAYARD HUGO BUCHER KUANG GUODUN |
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| Affiliation: | 1. Pal?ontologisches Institut und Museum, Universit?t Zürich, Karl Schmid‐Strasse 4, CH‐8006 Zürich, Switzerland;2. e‐mails: bruehwiler@pim.uzh.ch;3. hugo.fr.bucher@pim.uzh.ch;4. LMTG, UMR 5563 CNRS – Université Toulouse – IRD, Observatoire Midi‐Pyrénées, 14 Avenue Edouard Belin, F‐31400 Toulouse, France;5. e‐mail: brayard@lmtg.obs‐mip.fr;6. CNRS Biogéosciences, Université de Bourgogne, 6 Boulevard Gabriel, F‐21000, Dijon, France;7. Departement Erdwissenschaften, ETH Zürich, CH‐8092 Zürich, Switzerland;8. Guangxi Bureau of Geology and Mineral Resources, Jiangzheng Road 1, 530023 Nanning, China;9. e‐mail: kuangdm@gmail.com |
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| Abstract: | Abstract: Intensive sampling of the Luolou (northwestern Guangxi) and the Daye (southern Guizhou) Formations in South China leads to the recognition of a regional Griesbachian and Dienerian ammonoid succession for this key palaeobiogeographical area. The new biostratigraphical sequence comprises the upper Griesbachian ‘Ophiceras beds’ and the lower Dienerian ‘Proptychites candidus beds’, which are separated from the uppermost Dienerian ‘Clypites beds’ by an unfossiliferous interval. These faunas contain some taxa with wide geographic distribution (e.g. Ambites, Pleurambites, Pleurogyronites, Proptychites candidus), thus facilitating correlation with faunal successions from other regions (i.e. British Columbia, Canadian Arctic, Himalayas and South Primorye). Two new genera (Jieshaniceras and Shangganites) and three new species (Anotoceras subtabulatus, Pleurambites radiatus and Shangganites shangganense) are described. |
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| Keywords: | Ammonoidea Early Triassic South China Luolou Fm. Daye Fm. biostratigraphy |
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