紫阳文洛克统底界生物地层学新研究  

A New Study of Biostratigraphy of the Wenlock Bottom Boundaryin Ziyang, Shaanxi

作　　者：傅力浦[1] 张子福[1] 

机构地区：[1]西安地质矿产研究所,710054

出　　处：《地质论评》2004年第5期449-453,共5页Geological Review

基　　金：国家自然科学基金资助项目(编号49772028)科学技术部(36)专项资金资助项目的成果。

摘　　要：通过对紫阳地区10个文洛克统底界剖面的重新观察,笔者等认为晚兰多弗里期的标准化石Oktavites spiralis(Geinitz)从未进入文洛克统,这与国际上是一致的。过去在紫阳地区所有被鉴定为C.centrifugusBoucek的标本,经详细比较均应改为C.annularis Fu,其层位都产于C.lapworthi带。近年对芭蕉口剖面进行野外调查时,笔者等采到了真正的C.centrifugus Boucek和C.murchisoni Carruthers标本,因此更加完善了C.lapworthi-C.sakmaricus-C.insectus-C.centrifugus-C.murchisoni这一弓笔石演替序列。After restudying the 10 sections of the bottom boundary of the Wenlock Series in the Ziyang area, the writers suggest that the standard fossil Oktavites spiralis (Geinitz) of the late Llandovery has never entered the Wenlock. This conclusion is consistent with the international view. All the fossils which were identified as C. centrifugus Boucek in the Ziyang area should be changed to C. annularis Fu, and they all occur in the C. lapworthi biozone. In recent years authentic specimens of C. centrifugus Boucek and C. murchisoni Carruthers have been collected in Ziyang, which will substantiate the cyrtograptid succession process of C. lapworthi-C. sakmaricus-C. insectus-C. centrifugus-C. murchisoni.

关 键 词：生物地层学 化石 文洛克统 紫阳 志留纪 

分 类 号：Q911.6[天文地球—古生物学与地层学]