Griesbachian and Dienerian (Early Triassic) ammonoids from northwestern Guangxi and southern Guizhou

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 Gri...

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Bibliographic Details
Published in:Palaeontology
Main Authors: Brühwiler, T, Brayard, A, Bucher, Hugo, Guodun, K
Format: Article in Journal/Newspaper
Language:English
Published: Wiley-Blackwell 2008
Subjects:
Department of Paleontology
560 Fossils & prehistoric life
Arctic
Online Access:https://www.zora.uzh.ch/id/eprint/7109/
https://www.zora.uzh.ch/7109
Description
Summary: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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