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A Glyptagnostus reticulatus trilobite faunule from the Cambrian of the Northern Qilian Mountains, northwest China, and its paleogeographical implications

Published online by Cambridge University Press:  15 March 2022

Xuejian Zhu Open the ORCID record for Xuejian Zhu [Opens in a new window] ,
Nigel C. Hughes Open the ORCID record for Nigel C. Hughes [Opens in a new window]  and
Zhiqiang Zhou
Xuejian Zhu*
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
Nigel C. Hughes
Affiliation:
Department of Earth and Planetary Sciences, University of California, Riverside, California 92521, USA
Zhiqiang Zhou
Affiliation:
Xi'an Institute of Geology and Mineral Resources, 438 East You Yi Road, Xi'an 710054, China
*
*Corresponding author.
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Abstract

A Glyptagnostus reticulatus (Angelin, 1851)–bearing trilobite assemblage has been found from an unnamed Cambrian formation in the Northern Qilian Mountains area, of which geographical placement in the Cambrian is contested. Glyptagnostus reticulatus is a biostratigraphic indicator of the Furongian Series and Paibian Stage, and three agnostoid and six polymerid taxa from the Changgou section, Daliang area are described herein, along with conspecific forms from the nearby Chuancigou section. This well-preserved assemblage shows strong taxonomic affinity with northwestern Queensland, Australia, and western Hunan–eastern Guizhou, China, and likely comes from deep outer-shelf to slope setting associated with the Northern Qilian arc. It is consistent with other arguments that during the Cambrian, the Northern Qilian arc, along with the Hexi Corridor of the Alxa terrane, were more closely allied to South China than to North China.

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Journal of Paleontology , Volume 96 , Issue 4 , July 2022 , pp. 875 - 885
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Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Paleontological Society

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