新疆早寒武世玉尔吐斯小壳动物群再研究  

REVIEW OF SMALL SHELLY FAUNA OF YULTUS,EARLY CAMBRIAN OF XINJIANG

作　　者：肖兵 段承华[2] 

机构地区：[1]新疆维吾尔自治区地质矿产局地质矿产研究所 [2]中国地质科学院天津地质矿产研究所

出　　处：《新疆地质》1992年第3期212-232,289-292,共25页Xinjiang Geology

基　　金：本文为"七五"国家科技攻关项目--"305"项目V_(1O-Ⅰ)课题<新疆北部前寒武系及含矿性研究>成果的一部分

摘　　要：新疆乌什—阿克苏地区下寒武统玉尔吐斯组的小壳化石丰富,已描述了近50属90种,包括1个新属,15个新种。计有软舌螺类、似软舌螺类、单板类、腹足类、骨针类及分类位置未定的化石,还有节肢动物门的高肌虫类。按小壳化石在地层纵向出现的次序及其代表性,可将玉尔吐斯组小壳动物群的比石划分为3个带,即1.Anabarites trisulcatus带;2.Cambroclavus-Aurisella带;3.Adyshevitheca-Xinjiangella带。其中1带可与梅树村阶I.Anabarites-Protohertzina带对比;2—3带大致可与梅树村阶Ⅱ.Paragloborilus-Siphogonuchites带—Ⅲ.Sinosachites-Lapworthella带对比。因Aanbarites trisulcatus的发现,证实玉尔吐斯组的下界可与梅树阶的底界对比;玉尔吐斯组顶部发现的高肌虫有别于筇竹寺阶的高肌虫。前者与大量梅树村期小壳动物共生,可以认为梅树村期已经出现高肌虫的先遣分子。About 50 genera an 90 species of the small shelly fossils of Yultus Formation,Lower Cambrian in Wushi-Aksu region of Xinjiang were described. This fauna includes Monoplacophora, Gastropoda, Brachiopoda, Hy-olitha and Hyolitheminthes(Mollusca) ;the sclere type(porifera) (Bradoriida(Arthoropoda) and many indeterminate fossils. 18 genera and 24 species are involved in this paper,but only one new genera and 15 new species are described,which are Eoyochelcionella aksuensis Xiao et Duan,gen. et sp. nov. ,Porconus brevis Xiao et Du-an.sp.nov. ,Paragloborilus micrococcus Xiao et Duan,sp. nov. ,Paragloborilus rudis Xiao et Duan.sp.nov. , Persicitheca levis Xiao et Duan.sp. nov. ,Doliutheca caecidia Xiao et Duan.sp. nov. ,Lapworthella pyramidalis xiao et Duan,sp. nov. ,Sachites densistriatus Xiao et duan,sp. nov. ,Sachites grossus Xiao et Duan.sp. nov. , Sachites sepaloideus Xiao et Duan.sp. nov. ,Sachites angulosus Xiao et Duan.sp. nov. ,Zhkjinites panispiaosus Xiao et Duan.sp. nov. ,Zhijinites deltatus Xiao et Duan.sp. nov. , Acanthocassis indegestus Xiao et Duan.sp. nov. ,and Wushiella lycotuopa Xiao et Duan.sp. nov. Based on the sequence of occurence and reprensentive of small shelly fossils in stratigraphic sections,the fauna of Yultus Formation can be divided into three fossil zones as follows:1. Anabarites trisulcatus zone,2. Cambroclavus-Aurisella zone and, 3. Adyshevitheca-Xinjiangella zone, which correspond respectively to Anabarites-Protohertzina zone( Ⅰ), Paragloborilus-Siphogonuchites zone(Ⅱ)and Sinosachites-Lapworthella zone (Ⅲ)of Meishucun Stage. The discovery of Anabarites trisulcatus gives support to the deposition of Yultus Formation with small shelly fauna of Meishucun Stage. The bottom of Yultus Formation corresponds to the position between point A and point B of Meishucun section. The Bradoriida discovered at the top of Yultus Formation is a primitive type different from that of Qiongzhusi Stage. So the Badoriida, assured to exist in Yultus Formation,can be treated as a precursor for Qio

关 键 词：新疆 早寒武世 玉尔吐斯组 小壳动物群 高肌虫 化石带 

分 类 号：P5[天文地球—地质学]