This research is financially supported by the Natural Science Foundation of China (No.40742008, 40272020) and the Gelogical Survey of China(No. 1212011121103).We would like to express our sincerely thanks to Prof. S. Finney and Prof. B-D. Erdtmann, for their examination on the graptolite specimens. We are also in debt to Prof. B-D. Erdtmann and an anonymous reviewer for their critical reading of the manuscript, and for their valuable suggestions and comments. This paper is a contribution to the IGCP Project 591—The Early to Middle Paleozoic Revolution.
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.
WANG Chuanshang, WANG Xiaofeng, CHEN Xiaohong and LI Zhihong.2013. Taxonomy, Zonation and Correlation of the Graptolite Fauna across the Lower/Middle Ordovician Boundary Interval in the Yangtze Gorges Area, South China[J]. ACTA GEOLOGICA SINICA(English edition),87(1):32~47
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