摘要
根据采自湖北宜昌分乡陈家河和远安真金两剖面奥陶系牯牛潭组至宝塔组的牙形刺,将该段地层的牙形刺生物带自上而下综合划分为Hamarodus brevirameus,Amorphognathus superbus,Baltoniodus alobatus,Pygodus anserinus-Yangtzeplacognathus jianyeensis,Yangtzeplacognathus protoramosus,Yangtzeplacognathus foliaceus,Histiodella kristinae-Eoplacognathus suecicus,Dzikodus tablepointensis,Lenodus variabilis和Lenodus antivariabilis等牙形刺生物带。其中宝塔组之Hamarodus brevirameus,Amorphognathus superbus生物带及Baltoniodus alobatus生物带顶部归为凯迪阶(Katian),庙坡组Baltoniodus alobatus生物带大部和Pygodus anserinus-Yangtzeplacognathus jianyeensis生物带中上部归为桑比阶(Sandbian),而牯牛潭组的Yangtzeplacognathus protoramosus至Lenodus antivariabilis等牙形刺生物带和庙坡组Pygodus anserinus-Yangtzeplacognathus jianyeensis生物带下部则归入达瑞威尔阶(Darriwillian)。这一牙形刺带序列与宜昌黄花场和分乡剖面的牙形刺生物带相一致。
This paper describes the conodont faunas from the Pagoda Formation(Katian)to the Kuniutan Formation(Darriwilian)at the Chenjiahe and Zhenjin sections in Yichang,Hubei Province,with ten conodont biozones recognized.They include,in descending order,the Hamarodus brevirameus,Amorphognathus superbus,Baltoniodus alobatus,Pygodus anserinus-Yangtzeplacognathus jianyeensis,Yangtzeplacognathus protoramosus,Yangtzeplacognathus foliaceus,Histiodella kristinae-Eoplacognathus suecicus,Dzikodus tablepointensis,Lenodus variabilis,and L.antivariabilis biozones.The Katian/Sandbian boundary is within the Baltoniodus alobatus Biozone,while the Sandbian/Darriwilian boundary within the lower part of the Pygodus anserinus-Yangtzeplacognathus jianyeensis Biozone.The conodont biostratigraphic succession documented herein can be consistently correlated to that of the Huanghuachang and Fenxiang sections described by An(1987)and Zhang(1998).The conodont succession provides important data not only for supporting the regional biostratigraphic framework,but also for better understanding of the spacial and temporal distribution of the conodont biofacies in this classical region on the Yangtze Platform,where two Ordovician GSSPs(for the base of Dapingian and Hirnantian respectively)are located.
作者
王志浩
甄勇毅
马譞
张元动
WANG Zhihao;ZHEN Yongyi;MA Xuan;ZHANG Yuandong(Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008;Geological Survey of New South Wales, Londonderry, NSW 2753 , Australia;Key Laboratory of Economic Stratigraphy and Palaeogeography, Chinese Academy of Sciences, Nanjing 210008;University of Chinese Academy of Sciences, Beijing 100049)
出处
《微体古生物学报》
CSCD
北大核心
2018年第1期13-29,共17页
Acta Micropalaeontologica Sinica
基金
国家基金委创新研究群体项目(41521061
41290260)
中国科学院国际伙伴计划(SAFEA
20140491530)资助
中国海相地层研究项目
IGCP 653项目"奥陶纪生物大辐射的启动过程"的阶段成果~~
关键词
牙形刺
牯牛潭组
宝塔组
奥陶系
宜昌真金
陈家河
湖北
conodont, Kuniutan Formation, Pagoda Formation, Ordovician, Chenjiahe, Zhenjin, Yichang, Hubei Province, China