摘要
根据宜昌陈家河剖面大湾组的笔石标本,确立笔石序列自下而上为:Didymograptellus eobifidus带、Corymbograptus deflexus带和Azygograptus suecicus带(大湾组下段),Exigraptus clavus带和Undulogr aptusaustrodentatus带(大湾组上段)。对湖北南漳的全家湾和李家湾两剖面的大湾组进行了详细采集测量,其中全家湾剖面大湾组下段自下而上识别出D.eobifidus带、C.deflexus带和A.suecicus带;李家湾剖面大湾组下段自下而上识别出D.eobifidus带和A.suecicus带,证实南漳大湾组的底界与宜昌地区基本一致。
The Ordovician Dawan Formation of Yichang has been studied for a long time,but the graptolite succession of the formation is still poorly known,particularly due to the rare occurrences of graptolites.In the Nanzhangarea,ca.150km to the north of Yichang,little has been known about the biostratigraphy and graptolite sequence of the Dawan Formation,because almost no investigation has been carried out there.Here we conduct a study on the graptolite biostratigraphy of the Dawan Formation at the Chenjiahe section...
出处
《地层学杂志》
CSCD
北大核心
2008年第3期253-264,共12页
Journal of Stratigraphy
基金
中国科学院创新方向性项目(KZCX2-YW-122
KZCX3-SW-149)
科技部基础性工作专项(2006FY120300-4)资助
关键词
笔石
生物地层学
大湾组
奥陶系
南漳
宜昌
湖北
graptolite
biostratigraphy
Dawan Formation
Ordovician
Nanzhang
Yichang
Hubei
