鄂西恩施猫儿山二叠纪茅口组的牙形石  

THE "MAOKOU" FORMATION CONODONTS FROM MAOERSHAN SECTION IN ENSHI, THE WEST OF HUBEI PROVINCE

作　　者：张丽丽[1] 张宁[1] 夏文臣[1] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074

出　　处：《现代地质》2004年第3期297-304,共8页Geoscience

基　　金：中国石油化工股份有限公司项目(P02009)。

摘　　要：对湖北省恩施市至利川市的318国道旁猫儿山村的茅口组中上部地层进行了系统采样和详细研究,结果表明:茅口组顶部至少包括3个牙形石带,自下而上依次为Mesogondo lellaprexuanhanensis带、Mesogondolellaxuanhanensis带和Mesogondolellagranti带,并且前两个牙形石带可以和四川宣汉渡口剖面相应的牙形石带进行对比。该剖面出现了M granti带,而且其时限较长,充分说明了扬子地台二叠纪茅口期牙形石生物地层的连续性,同时也为研究鄂西地区二叠系生物地层提供了新的资料。By sampling and studying carefully in Maoershan section which lies in the 318 national highway from Enshi to Lichuan,the west of Hubei Province,it's found that in the middle to upper'Maokou'Formation,there are at least three conodont zones:Mesogondolella prexuanhanensis zone,M.xuanhanensis zone and M.granti zone. And the former two fossil zones can correspond with those of the Dukou section of Xuanhan city,Sichuan Province. Mesogondolella granti zone can be found in the Maoershan section and it's time limit is comparatively long,which indicates the Maokou Stage biologic strata of conodonts are continuous in Yangtze Platform. In addition, this paper offers new information for the study of biologic strata in the west of Hubei Province.

关 键 词：二叠纪 茅口组 牙形石 猫儿山剖面 恩施 鄂西 

分 类 号：Q915.81[天文地球—古生物学与地层学]