新疆乌什下寒武统肖尔布拉克组软舌螺化石  

HYOLITHS FROM THE LOWER CAMBRIAN XIAOERBULAKR FORMATION OF WUSHI,XINJIANG

作　　者：钱逸[1] 李国祥[1] 朱茂炎[1] 尹恭正 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]贵州省地质矿产局区调院,贵阳550005

出　　处：《微体古生物学报》2003年第4期342-349,共8页Acta Micropalaeontologica Sinica

基　　金：国家重点基础研究发展规划项目(G2000077700);中国科学院知识创新工程项目(KZCX2-116);国家自然科学基金项目(4 0232020;40172002);"九五"国家攀登计划专项(攀-95-专-01-2-3);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开放实验室资助项目(003111)资

摘　　要：首次描述了采自新疆乌什县乌什磷矿肖尔布拉克组中部 Kepingaspis- Tianshanocephalus带中的 2个软舌螺新种 Conotheca xinjiangensissp. nov.,N itorcornus wushiensis sp. nov.和下部 Ushbaspis带中的 1个软舌螺未定种Adyshevitheca?sp.。这些软舌螺化石材料为研究新疆乌什地区下寒武统中部地层与邻区相当层位的对比提供了新的证据 ,认为肖尔布拉克组中部 2个三叶虫化石带和其中的软舌螺化石相当于我国扬子地台下寒武统沧浪铺阶中部 ,即乌龙箐亚阶和红井哨亚阶之间 ,可与俄罗斯西伯利亚和哈萨克斯坦下寒武统波特姆阶 (Botomian)中的三叶虫带 Ushbaspis和软舌螺带 Erraticornus- NThe hyolithid fossils studied herein were collected from the Lower Cambrian Xiaoerbulake Formation at the Wushi Phosphorite section in Wushi (Fig.1), Xinjiang. Two new hyolithid species, Conotheca xinjiangensis sp. nov. and Nitorcornus wushiensis sp. nov.,and an indeterminate species ?Adyshevitheca sp. are systematically described. C. xinjiangensis sp. nov. and N. wushiensis sp. nov. occur in the trilobite Kepingaspis\|Tianshanocephalus Biozone (Bed 11 of Zhou, 2001), while ? Adyshevitheca sp. occurs in the trilobite Ushbaspis Biozone (Bed 8 of Zhou, 2001) of the Xiaoerbulak Formation (Fig.2). These hyolithid fossils provide new evidence for the biostratigraphic correlation of the Xiaoerbulake Formation with the corresponding horizons in the adjacent areas. Trilobite biostratigraphy suggests that the two fossil horizons of the Xiaoerbulake Formation can be correlated with strata of the middle Canglangpuan stage on the Yangtze Platform, and with the Botomian stage on the Siberia Platform and in Kazakstan.

关 键 词：软舌螺 下寒武统 肖尔布拉克组 乌什 新疆 

分 类 号：Q916[天文地球—古生物学与地层学]