摘要
The Global Stratotype Section and Point （GSSP） for the base-Changhsingian Stage is defined at the First Appearance Datum （FAD） of the conodont Clarkina wangi within the lineage from C. longicuspidata to C. wangi at a point 88 cm above the base of the Changxing Limestone in the lower part of Bed 4 （base of 4α-2） at Meishan D section, Changxing County, Zhejiang Province, South China. This level is consistent with the first appearance of Changhsingian index fusulinid Palaeofusulina sinensis and tapashanitid ammonoids. The speciation event from Clarkina longicuspidata to C. wangi occurs just above the flooding surface of the second parasequence in the Changxing Limestone. In addition, the boundary interval is clearly recognizable by the depletion of isotopic carbon ratios and the normal polarity zone appearing above the Late Wuchiapingian reversed polarity zone. Section C, about 300 m to the west of Section D, exposes more of the upper Longtan Formation. It clearly shows the transitional nature of deposition across the Longtan/Changxing formational boundary, and thus is described as a supplementary reference section.
作者简介
Yugan Jin was Research Professor of Nanjing Institute of Geology and Palaeontology, Academician of Chinese Academy of Sciences. His research was concentrated on the Carboniferous and Permian stratigraphy and the Late Palaeozoic and Mesozoic brachiopods. He was the leader of the International Working Group on Lopingian Series, past Chairman （1989-1996） of the International Subcommission on Permian Stratigraphy, vice President of lnternational Palaeontological Association.Yue Wang, graduated from Nanjing University in 1991, received Ph.D. from Nanjing Institute of Geology and Palaeontology in 1998, is Research Professor of State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology. Her research is mainly concentrated on the Permian fusulinoideans and stratigraphy. She is the voting member of the Subcommission on Permian Stratigraphy for the International Commission on Stratigraphy.Corresponding author E-mail： yuewang@nigpas.ac.cn.Charles Henderson is a Full Professor at the Department of Geology and Geophysics, University of Calgary, Alberta, Canada where he teaches field methods, paleobiology and stratigraphy. His main research interests deal with conodont biostratigraphy and global chronocorrelation of the Late Paleozoic and Triassic. He has worked extensively in arctic and western Canada as well as China. His research as well as that of his several students is highlighted in his website at www.geo.ucalgary.ca/asrg. He is the current chairman of the Subcommission on Permian Stratigraphy for the International Commission on Stratigraphy.
