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A restudy of the Sandbian to Katian (Upper Ordovician) graptolites from the East Qilianshan (Chilianshan), Northwest China

Published online by Cambridge University Press:  22 August 2019

Xu Chen ,
Zhongyang Chen Open the ORCID record for Zhongyang Chen [Opens in a new window] ,
Charles E. Mitchell ,
Qing Chen  and
Linna Zhang
Xu Chen*
Affiliation:
CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China Academician Studio, Zhejiang Nuclear Industry Geological Survey Team, Huzhou 313000, China
Zhongyang Chen
Affiliation:
Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
Charles E. Mitchell
Affiliation:
Department of Geology, University at Buffalo, State University of New York, 126 Cooke Hall, Buffalo, New York 14260, USA
Qing Chen
Affiliation:
CAS Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
Linna Zhang
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China
*
*Corresponding author
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Abstract

The Upper Ordovician Sandbian to Katian strata from the East Qilianshan (northeastern Tibet Plateau) bear a graptolite fauna of moderately high diversity. Graptolites from the Amplexograptus maxwelli beds to the Appendispinograptus longispinus Biozone (Sa2–Ka4 intervals) proposed herein include 27 species of 13 genera. This important graptolite fauna is first described herein although it was initially reported in 1963. Most of them occur in the A. longispinus Biozone corresponding to the Dicellograptus complexus to Paraorthograptus pacificus biozones of the Wufeng Formation in the Yangtze region. Alulagraptus new genus is established based on the materials from the East Qiqiaogou section. The endemic species, e.g., Alulagraptus ensiformis (Mu and Zhang in Mu et al., 1963), Dicellograptus sinicus Mu and Zhang in Mu et al., 1963, and Climacograptus? papilio Mu and Zhang in Mu et al., 1963, could indicate that East Qilianshan block was separated from South China.

UUID: http://zoobank.org/84ab69a2-0b56-4ec3-912e-730da08ab10a

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Journal of Paleontology , Volume 93 , Issue 6 , November 2019 , pp. 1175 - 1209
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Copyright © 2019, The Paleontological Society 

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