华南黄陵背斜西翼兴山地区乡儿湾剖面埃迪卡拉系陡山沱组微体化石

Microfossils from the Ediacaran Doushantuo Formation at the Xiangerwan section of Xingshan area in the western flank of Huangling anticline,South China

本文首次报道并描述了华南黄陵背斜西翼湖北宜昌兴山县乡儿湾剖面埃迪卡拉系陡山沱组二段中上部的燧石结核和条带中的疑源类微体化石,经系统鉴定共识别出8属8种,包括Appendisphaera grandis,Crassimembrana multitunica,Leiosphaeridia minutissima,Megasphaera inornata,Schizofusa zangwenlongii,Symphysosphaera basimembrana,Urasphaera nupta,Variomargosphaeridium gracile。该化石组合包含Liu Pengju and Moczyd?owska(2019)所建立的第二生物组合带(Tanarium tuberosum-Schizofusa zangwenlongii组合带)的特征分子Schizofusa zangwenlongii,因此,可尝试性地与第二生物组合带相对比,但未见黄陵背斜东南翼陡山沱组二段的常见属Tianzhushania,据此推测黄陵背斜两翼在古环境上可能有所差异。

The acritarch microfossils arediscovered from the chert nodules and bands in the MemberⅡof the Ediacaran Doushantuo Formation at Xiangerwan section in the western flank of Huangling anticline in the Xingshan County of Yichang,Hubei Province,South China.They are represented taxonomically by 8 species of 8 genera,including Appendisphaera grandis,Crassimembrana multitunica,Leiosphaeridia minutissima,Megasphaera inornata,Schizofusa zangwenlongii,Symphysosphaera basimembrana,Urasphaera nupta,Variomargosphaeridium gracile.Since the existence of Schizofusa zangwenlongii,it might be tentatively correlated with the second assemblage zone(Tanarium tuberosum-Schizofusa zangwenlongii)proposed by Liu and Moczydłowska(2019).However,it does not contain genus Tianzhushania which is common in the MemberⅡof the Doushantuo Formation in the southeastern flank of Huangling anticline,there might exist environmental variations between the two flanks of the Huangling anticline.