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The Ladinian–Carnian conodont fauna at Yize, Yunnan, southwestern China, with implications for conodont palaeoecology and palaeogeography

Published online by Cambridge University Press:  06 February 2023

Zaitian Zhang  and
Yadong Sun Open the ORCID record for Yadong Sun [Opens in a new window]
Zaitian Zhang
Affiliation:
Wuhan Centre, China Geological Survey, Wuhan 430205, People’s Republic of China State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074, People’s Republic of China State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS, Nanjing 210008, People’s Republic of China
Yadong Sun*
Affiliation:
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074, People’s Republic of China GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schlossgarten 5, Erlangen 91054, Germany
*
Author for correspondence: Yadong Sun, Email: yadong.sun@cug.edu.cn
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Abstract

Subdivisions of Ladinian–Carnian boundary beds and the lower Carnian strata in South China are challenging owing to a paucity of west Tethyan ammonoids. We investigated a conodont fauna in a continuous section at Yize in eastern Yunnan Province to provide a biostratigraphic solution. Five genera and 24 conodont species are recognized, and five conodont zones are established. The zones are, in ascending order, the Paragondolella inclinata Zone, the Quadralella polygnathiformis Zone, the Quadralella praelindae Zone, the Quadralella auriformis Zone and the Quadralella robusta Zone. The Ladinian–Carnian boundary is provisionally defined by the first occurrences of Quadralella polygnathiformis and Quadralella intermedia in the cherty limestone member of the Zhuganpo Formation. Regional correlations via conodont biostratigraphy indicate that the Zhuganpo Formation is probably diachronous, with a maximal range spanning the upper Ladinian to the lower Carnian. Amongst all common late Ladinian – early Carnian conodont genera, Paragondolella, Quadralella and Mazzaella are probably cosmopolitan. Budurovignathus was restricted to a few basins and probably preferred offshore or deep-water environments.

Keywords

Late Triassicbiostratigraphyconodont palaeoecologyZhuganpo Formation
Type
Original Article
Information
Geological Magazine , Volume 160 , Issue 4 , April 2023 , pp. 776 - 793
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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