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Middle Ordovician lithistid sponges from the Bachu-Kalpin area, Xinjiang, northwestern China

Published online by Cambridge University Press:  20 May 2016

Liu Bingli
Affiliation:
Department of Geology, Jianghan Petroleum University, Jingzhou, Hubei 434102, China,
J. Keith Rigby
Affiliation:
Department of Geology, 389 ESC, Brigham Young University, Provo, Utah 84604-4606,
Zhu Zhongde
Affiliation:
Department of Geology, Jianghan Petroleum University, Jingzhou, Hubei 434102, China,

Abstract

Moderately diverse Middle Ordovician sponge faunas of Darriwilian (late Arenig to early Llanvirn) age have been discovered in outcrops in the Bachu-Kalpin area of the Tarim platform of Xinjiang, China. These are the first reported occurrences of early Paleozoic sponges from Xinjiang, China. These sponges occur in the Yijianfang and Dawangou Formations, which are of nearly the same age, but crop out in different areas of the platform margin. Fossil sponges discovered to date are the anthaspidellid lithistid sponges Archaeoscyphia minganensis (Billings, 1859); Hudsonospongia cyclostoma Raymond and Okulitch, 1940; Calycocoelia profunda sichuanensis Deng, 1990; Calycocoelia sp.; Pseudopalmatohindia sp.; Aulocopium sp.; Annulospongia tarimensis n. gen. and sp.; Rhopalocoelia kalpinensis n. sp.; Rhopalocoelia bachuensis n. sp.; and Zittelella xinjiangensis n. sp. They are preserved in reefal limestones and are associated with Calathium, cyanobacteria, and bryozoans, like in many North American assemblages.

Type
Research Article
Copyright
Copyright © The Paleontological Society

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