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Polygnathids (Conodonta) around the Pragian/Emsian boundary from the Dacun-1 section (central Guangxi, South China)

Published online by Cambridge University Press:  27 May 2019

Jian-Feng Lu ,
José Ignacio Valenzuela-Ríos ,
Jau-Chyn Liao  and
Yi Wang
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 , Department of Botany and Geology, University of Valencia, c/Dr. Moliner 50, Burjassot 46100, Spain < jose.i.valenzuela@uv.es>, < jau.liao@uv.es>
José Ignacio Valenzuela-Ríos
Affiliation:
Department of Botany and Geology, University of Valencia, c/Dr. Moliner 50, Burjassot 46100, Spain < jose.i.valenzuela@uv.es>, < jau.liao@uv.es>
Jau-Chyn Liao
Affiliation:
Department of Botany and Geology, University of Valencia, c/Dr. Moliner 50, Burjassot 46100, Spain < jose.i.valenzuela@uv.es>, < jau.liao@uv.es>
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 ,
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Abstract

The base of the Emsian, which is defined by the first appearance of the conodont Polygnathus kitabicus, has never been successfully demonstrated in the South China Block (including Guangxi and eastern Yunnan). As a result, we studied conodonts from the lowermost part of the Shizhou Member of the Yukiang Formation at the Dacun-1 section in the Liujing area, Guangxi. This new investigation has revealed a conodont fauna only consisting of Polygnathus pireneae, P. sokolovi, P. kitabicus, P. sp. and Pandorinellina exigua philipi, which can be assigned to the uppermost part of the pireneae Zone and the lowermost part of the kitabicus Zone in ascending order. The Pragian/Emsian boundary at the Dacun-1 section is located in the highest thick-bedded limestone bed that can be observed in the lowermost part of the Shizhou Member. Therefore, this is the first time that the lower boundary of the Emsian defined by the lowest occurrence of P. kitabicus is reported in the South China Block. However, the scarcity of suitable limestone samples for conodont analysis in the middle and upper parts of the Shizhou Member precludes definitive identification of the upper boundary of the kitabicus Zone in the Liujing area.

Type
Articles
Information
Journal of Paleontology , Volume 93 , Issue 6 , November 2019 , pp. 1210 - 1220
Copyright
Copyright © 2019, The Paleontological Society 

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