Late Changhsingian (Latest Permian) radiolarians from Chaohu, Anhui

Abstract

This article reports a radiolarian fauna from the upper Dalong (大隆) Formation, Pingdingshan (平顶山), Chaohu (5DE2;湖), Anhui (安徽) Province, which includes 15 genera and 23 species. One new species, Copicyntra tongi Gui and Feng n. sp., is described. Comparison of the fauna, lithology and biotic associations with those from Meishan (煤山) D and Dongpan (东攀) sections shows that the Dalong Formation in the Pingdingshan Section is deposited in a deep-water shelf basin, about 60–200 m in depth. On the basis of the biotic composition, diversity and morphology, the microfossil fauna from the Pingdingshan Section can be divided into three sedimentary assemblages and the extinction processes of the assemblages are discussed.

Keywords

radiolarian / sedimentary environment / extinction / upper Dalong Formation / Chaohu

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