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Lochkovian (Lower Devonian) conodonts from the Alengchu section, western Yunnan, China

Published online by Cambridge University Press:  02 December 2021

Jian-Feng Lu Open the ORCID record for Jian-Feng Lu [Opens in a new window] ,
Xue-Ping Ma ,
Wen-Kun Qie ,
Kun Liang Open the ORCID record for Kun Liang [Opens in a new window]  and
Bo Chen
Jian-Feng Lu*
Affiliation:
Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China , , ,
Xue-Ping Ma
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution (MOE), School of Earth and Space Sciences, Peking University, Yiheyuan Road 5, Beijing 100871, China
Wen-Kun Qie
Affiliation:
Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China , , ,
Kun Liang
Affiliation:
Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China , , ,
Bo Chen
Affiliation:
Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China , , ,
*
*Corresponding author
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Abstract

The Lochkovian (Lower Devonian) conodont biostratigraphy in China is poorly known, and conodont-based subdivision schemes for the Lochkovian in peri-Gondwana (the Spanish Central Pyrenees, the Prague Synform, Sardinia, and the Carnic Alps) have not been tested in China. Therefore, we studied conodonts from the lower part (Bed 9 to Bed 13) of the Shanjiang Formation at the Alengchu section of Lijiang, western Yunnan to test the application of established subdivision schemes. The conodont fauna is assignable to 12 taxa belonging to eight genera (Ancyrodelloides, Flajsella, Lanea, Wurmiella, Zieglerodina, Caudicriodus, Pelekysgnathus, and Pseudooneotodus), and enables recognition of two chronostratigraphical intervals from the lower part of the Shanjiang Formation. The interval ranging from the uppermost part of Bed 9 to the upper part of Bed 10 belongs to the lower Lochkovian; whereas an interval covering the uppermost part of Bed 11 to the upper part of Bed 13 is correlated with the upper half of the middle Lochkovian. The Silurian-Devonian boundary is probably located within Bed 9, in the basal part of the Shanjiang Formation. However, the scarcity of specimens precludes definitive identification of bases of the lower, middle, and upper Lochkovian as well as other conodont zones recognized in peri-Gondwana.

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Journal of Paleontology , Volume 96 , Issue 3 , May 2022 , pp. 638 - 657
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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