The Global Boundary Stratotype Section and Point （GSSP） for the base of Changhsingian Stage （Upper Permian）  

作　　者：Yugan Jin Yue Wang Charles Henderson Bruce R. Wardlaw Shuzhong Shen Changqun Cao 

机构地区：[1]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008 China [2]Department of Geology and Geophysics, University of Calgary, Calgary, Alberta, Canada T2N 1N4 [3]U.S. Geological Survey, Reston, 12201 Sunrise Valley Drive, National Center, VA 22092, USA

出　　处：《Episodes》2006年第3期175-182,共8页地质幕（英文版）

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.

关 键 词：二叠纪 石灰石 全球界线层型剖面和节点 沉积作用 牙形石 

分 类 号：P588.245[天文地球—岩石学]