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The first discovery of Lochkovian (Lower Devonian) conodonts in central Guangxi, South China and its geological implications

Published online by Cambridge University Press:  15 February 2023

Jian-Feng Lu Open the ORCID record for Jian-Feng Lu [Opens in a new window] ,
Wen Guo Open the ORCID record for Wen Guo [Opens in a new window] ,
Yi Wang  and
Hong-He Xu
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 , , ,
Wen Guo
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 , , ,
Yi Wang
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 , , ,
Hong-He Xu
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, Pragian, and basal part of the Emsian, which represent the post-Kwangsian Orogeny strata in the South China Block, are mainly composed of siliciclastic rocks. This lithological composition impedes investigation of Pragian and Lochkovian conodont biostratigraphy in the South China Block, which results in a persistent controversy on the age of relevant lithological units. The present study provides new evidence by reporting for the first time Lochkovian conodonts obtained from the South China Block, specifically the Gaoling Member of the Nahkaoling Formation at the Lingli section, central Guangxi. The conodont fauna, consisting of Pandorinellina exigua lingliensis Lu n. subsp., Pandorinellina exigua exigua, Zieglerodina? tuojiangensis Lu n. sp., Amydrotaxis praejohnsoni, and Eognathodus cf. E. irregularis, places the studied interval of the Gaoling Member in the lower or middle Lochkovian (contingent upon varying definitions for the base of the middle Lochkovian) to lower Pragian. Moreover, Amydrotaxis praejohnsoni, which was reported previously only in North America and eastern Australia, is herein also recorded in the South China Block, and thus may play an important role in intercontinental biostratigraphical correlation. By shedding light on the age of the upper limit of the underlying Lianhuashan Formation at the Lingli section, the present study indicates that the Kwangsian Orogeny ended before the late Lochkovian. This date is slightly earlier than the previously estimated late Lochkovian based on studies of fossil plants from the siliciclastic rocks deposited after the Kwangsian Orogeny.

UUID: http://zoobank.org/8010f983-4f6f-43dd-949f-de4653e53d9d

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Information
Journal of Paleontology , Volume 97 , Issue 2 , March 2023 , pp. 421 - 433
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Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Paleontological Society

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