Episodes 2006; 29(3): 175-182
Published online September 1, 2006
Copyright © International Union of Geological Sciences.
Yugan Jin1, Yue Wang1*, Charles Henderson2, Bruce R. Wardlaw3, Shuzhong Shen1, and Changqun Cao1
1State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008 China *Corresponding author E-mail: email@example.com
2Department of Geology and Geophysics, University of Calgary, Calgary, Alberta, Canada T2N 1N4
3U.S. Geological Survey, Reston, 12201 Sunrise Valley Drive, National Center, VA 22092, USA
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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 4a-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.