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Durham University

Department of Earth Sciences

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Publication details for Professor David Harper

Huang, Bing, Zhou, Hang-Hang, Harper, David A.T., Zhan, Ren-Bin, Zhang, Xiao-Le, Chen, Di & Rong, Jia-Yu (2020). A latest Ordovician Hirnantia brachiopod fauna from western Yunnan, Southwest China and its paleobiogeographic significance. Palaeoworld 29(1): 31-46.

Author(s) from Durham

Abstract

A new, high-diversity, latest Ordovician brachiopod fauna of nearly 800 brachiopod
specimens was collected from the Wanyaoshu Formation (Hirnantian) in the Shaodihe
section, Mangshi City, western Yunnan, Southwest China. Altogether 22 genera and
two undetermined taxa were identified; dominant are Aegiromena, Anisopleurella,
Fardenia, Dalmanella, Hirnantia and Hindella, less common, Paromalomena,
Leptaena, Eostropheodonta, Cliftonia, Kinnella, Templeella and Plectothyrella,
together with some rare Petrocrania, Xenocrania, Pseudopholidops,
Palaeoleptostrophia, Skenidioides, Giraldibella, Draborthis, Dolerorthis and Toxorthis.
This is one of the most diverse typical Hirnantia faunas, associated with the Kosov
Province. The paleobiogeographic relationships between western Yunnan (Southwest
China), Myanmar, Yichang (Central China), Tibet (Southwest China) and Kazakhstan
are clarified using Network Analysis and NMDS. The fauna studied is most similar to that of Myanmar; both resided on the Sibumasu terrane. However, the recalculated
network diagram, when including the data of Hirnantia fauna from the Prague Basin,
indicates that the latter is more closely linked to that of western Yunnan, a testament to
the very weak brachiopod provincialism during the Hirnantian, mainly due to the
influence of dominant cosmopolitan taxa. Some species of the fauna display significant
population variation. Two of the dominant taxa, Aegiromena and Anisopleurella are
systematically described, whereas the other two common taxa, Fardenia and Hirnantia
are measured and their outlines and internal structures analyzed.