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Zonation and biofacies of the Early Mississippian conodonts from Baoshan, Yunnan, Southwest China

Palaeoworld, ISSN: 1871-174X, Vol: 33, Issue: 3, Page: 636-649
2024
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Article Description

Early Mississippian Yudong and Shihuadong formations are well exposed in the Yudong I and Yudong II sections, Shidian, Baoshan, western Yunnan, Southwest China. Abundant and diverse conodonts are recovered from the two formations. A total of 29 species/subspecies belonging to 10 genera are identified. The Siphonodella and Scaliognathus anchoralis - Gnathodus pseudosemiglaber zones are recognized. Through cluster analysis, one conodont biofacies, Polygnathus biofacies, and two subbiofacies, Bispathodus - Pseudopolygnathus and Gnathodus subbiofacies, are identified. Changes in these conodont biofacies and subbiofacies are interpreted as a result of fluctuation of sea level in the Baoshan Block during the middle to late Tournaisian, Early Mississippian. Geniculatus claviger is recovered and systematically described in China for the first time.

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