Taxonomy,Zonation and Correlation of the Graptolite Fauna across the Lower/Middle Ordovician Boundary Interval in the Yangtze Gorges Area,South China  

作　　者：WANG Chuanshang WANG Xiaofeng CHEN Xiaohong LI Zhihong 

机构地区：[1]Wuhan Center of China Geological Survey

出　　处：《Acta Geologica Sinica(English Edition)》2013年第1期32-47,44-47+43,共16页地质学报（英文版）

基　　金：supported by the Natural Science Foundation of China(No.40742008,40272020);the Gelogical Survey of China(No. 1212011121103)

摘　　要：The graptolite fauna across the Lower and Middle Ordovician boundary at the Huanghuachang GSSP section, Yichang and the Jianyangping section, Xingshan County is described. The taxonomy of the pendent didymograptids, the graptolite zonations across the base of Middle Ordovician and their correlations are discussed in this paper. The two revised graptolite zones, the Didymograptellus bifidus Zone and the Azygograptus suecicus Zone, can be well correlated to their equivalents elsewhere in the world.The graptolite fauna across the Lower and Middle Ordovician boundary at the Huanghuachang GSSP section, Yichang and the Jianyangping section, Xingshan County is described. The taxonomy of the pendent didymograptids, the graptolite zonations across the base of Middle Ordovician and their correlations are discussed in this paper. The two revised graptolite zones, the Didymograptellus bifidus Zone and the Azygograptus suecicus Zone, can be well correlated to their equivalents elsewhere in the world.

关 键 词：GRAPTOLITE Huanghuachang section Middle Ordovician 

分 类 号：P52[天文地球—古生物学与地层学]