贵州金沙下寒武统牛蹄塘组中的高肌虫  

The Bradoriida of the Niutitang Formation from Traditional Lower Cambrian in Jinsha County,Guizhou Province

作　　者：杨兴莲[1,2] 祝明金[1] 朱露艳[1] 崔滔[1] 

机构地区：[1]贵州大学资源与环境工程学院,贵阳550003 [2]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008

出　　处：《高校地质学报》2009年第3期296-303,共8页Geological Journal of China Universities

基　　金：中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室基金(083103);973项目(2006CB806401);黔科合J字[2007]2151号项目;贵州大学博士启动基金项目;贵州大学大学生创新性实验计划项目资助

摘　　要：描述了贵州金沙岩孔镇长岩沟下寒武统(纽芬兰统-寒武系2统)牛蹄塘组底部黑色页岩中呈碳质薄膜保存的高肌虫化石,共2属1种1相似种和1未定种:朵氏昆明虫Kunmingella douvillei,昆明虫(未定种)Kunmingella sp.和新月形遵义虫相似种Tsunyiella cf.luna。这些高肌虫化石与最古老的三叶虫Tsunyidiscus(Mianxiandiscus)共生,其层位可与云南的Abadiella带对比,表明Kunmingella和Tsunyiella的下限层位已下延至筇竹寺阶的底部。本应属于早寒武世高肌虫分布中区的金沙一带却发现了西区的典型分子Kunmingella和中区的Tsunyiella,说明西区与中区间的混生区的范围应从长宁-镇雄小区扩大至贵州的金沙和织金一带。贵州寒武系底部大量高肌虫的发现丰富了牛蹄塘生物群的组成,对研究寒武纪早期生物的演化具有一定的意义。Some Bradoriida fossils were preserved in the manner of carbonaceous membrane in black shale of the lower part of the Niutitang Formation of the traditional Lower Cambrian（Terreneuvian and Cambrian Series 2）in Zhangyangou Village,Yankong Town,Jinsha County,Guizhou Province.They include two genera,one species,one conformis species and one uncertain species as listed below：Kunmingella douville,Kunmingella sp.and Tsunyiella cf.luna.These bradoriid fossils were found in association with the oldest trilobite Tsunyidiscus（Mianxiandiscus）,showing that their horizon is equivalent to the Abadiella Zone in Yunnan Province.Moreover,the lower horizon of Kunmingella and Tsunyiella may be correlated with the lower part of Qiongzhusian Stage.Kunmingella as an element in western palaeobiogeographical area and Tsunyiella as an element in middle palaeobiogeographical area appear together in Jinsha County belonging to the middle palaeobiogeographical area of early Cambrian bradoriids.Consequently,the range of mictium between the western and middle palaeobiogeographical area can be extend from ChangningZhengxiong subdistrict to Jinsha and Zhijin Counties.The discovery of numerous bradoriid at the base of the Cambrian enriched the components of the Niutitang biota,and is of importance in studying the evolution of early organisms in Cambrian.

关 键 词：高肌虫 牛蹄塘组 下寒武统 贵州金沙 

分 类 号：Q911.6[天文地球—古生物学与地层学] P534.41[生物学—古生物学]