湖北宜昌远安地区中—上奥陶统高精度牙形类生物地层研究  

MIDDLE AND UPPER ORDOVICIAN CONODONT BIOSTRATIGRAPHY AT THE YUAN’AN AREA,YICHANG IN HUBEI PROVINCE

作　　者：张亚涛 龚方怡 栾晓聪 闫冠州 张竹桐 魏鑫[1] 吴荣昌[1] ZHANG Yatao;GONG Fangyi;LUAN Xiaocong;YAN Guanzhou;ZHANG Zhutong;WEI Xin;WU Rongchang(Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院南京地质古生物研究所,南京210008 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国科学院大学,北京100049

出　　处：《微体古生物学报(中英文)》2025年第1期10-29,共20页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(42202031,41672008);中国科学院青年创新促进会(2019308)的资助。

摘　　要：湖北宜昌是我国上扬子区奥陶纪牙形类研究的经典地区之一;本文选取宜昌地区远安嫘祖镇窑河大桥剖面中、上奥陶统开展高精度牙形类生物地层学研究。针对牯牛潭组、庙坡组、宝塔组和临湘组进行了系统的牙形类样品采集,共采集样品69件,分析出大量的牙形类化石;经系统鉴定牙形类28属56种,根据该剖面牙形类各属种的延限,共识别出10个牙形类生物带,由下及上依次为Lenodus antivariabilis带、L.variabilis带、Yangtzeplacognathus crassus带、Eoplacognathus pseudoplanus带、E.suecicus带、Y.foliaceus带、Y.protoramosus带、Y.jianyeensis带、Baltoniodus alobatus带和Hamarodus brevirameus带。研究表明,窑河大桥剖面中、上奥陶统牙形类生物地层序列较为完整,可在华南板块内以及全球不同板块之间进行良好的地层对比。The Middle and Upper Ordovician conodont biostratigraphy of the Yaohe section,Yichang,Hubei Province,has been reported in the present paper.Fifty-six species of 28 genera have been identified from the Yaohe section.Ten conodont biozones can be observed from the Kuniutan,Miaopo,Pagoda to Linhsiang formations,in ascending order,including the Lenodus antivariabilis,L.variabilis,Yangtzeplacognathus crassus,Eoplacognathus pseudoplanus,E.suecicus,Y.foliaceus,Y.protoramosus,Y.jianyeensis,Baltoniodus alobatus and Hamarodus brevirameus biozones.The conodont biozones recognized in the Yaohe section can be correlated well with those from other areas in the Yangtze Platform and other palaeoplates.

关 键 词：牙形类 生物地层 中−上奥陶统 上扬子区 宜昌 

分 类 号：Q915[天文地球—古生物学与地层学]