Radiolarian fauna from the Chiungchussuan Shuijingtuo Formation(Cambrian Series 2) in Western Hubei Province, South China

作     者：Qiangfen MA Qinglai FENG Wenchao CAO Lei ZHANG Yan YE Songzhu GU 

作者机构：State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan430074China School of Earth ScienceChina University of GeoscienceWuhan430074China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2019年第62卷第10期

页      面：1645-1658页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.41430101) 

主　　题：Cambrian Series 2 Radiolaria Taxonomy Evolution South China Cambrian explosion 

摘      要：Little is known regarding characteristics and evolution of radiolarian fossils in the early Cambrian due to its rarity and poor preservation. Here we report a new radiolarian fauna from the Cambrian Shuijingtuo Formation corresponding to the Chiungchussuan Stage(Cambrian Series 2) in western Hubei, China. It contains over 300 radiolarian tests and these fossils belong to 4 morphotypes, including Paraantygopora porosa *** sp. nov., Braunosphaera sinensis *** sp. nov., Tetrasphaera? sp. and incertae spherical radiolarians. In taxonomy, Spumellaria predominates in the fauna and comprises 92% of the total. In shell structure, about 73% of all specimens are similar to the early Ordovician radiolarian fossils, with the shell walls characterized by perforated plate structures. The spherical radiolarians with latticed shells constitute another feature of the early Cambrian radiolarian fauna. The radiolarian fauna reported here contains many fossil specimens and covers different taxonomical taxa. These specimens usually consist of distinctive concentric multi-layers with complex structure. These characteristics indicate that Radiolaria had already thrived during the Cambrian Chiungchussuan Stage(Series 2, Stage 3), which may have occurred synchronously with the explosion and prosperity of macrobiota recorded in the strata deposited in shallower water condition.