GSSP for Changhsingian Stage
The Base of the Changhsingian Stage is defined at the base of Bed 4a-2, 88 cm above the base of the Changxing Limestone at the Meishan D Section, just above a flooding surface marking the second parasequence in the Changxing Limestone. The GSSP coincides with the FAD of the conodont species Clarkina wangi within the lineage from Clarkina longicuspidata to Clarkina wangi.
The section is located at the Meishan Section D, Changxing County, Zhejiang Province between Nanjing and Shanghai, China at a latitude of 31°4'55"N and a longitude of 119°42'22.9"E and is freely accessible and well protected.
exposure at the Meishan D section contains only the uppermost part of the Longtan
Formation. These beds include earthy yellow, calcareous siltstone and
mudstone with horizontal beds of increasing thickness that contain ammonoids
and brachiopods. This bed appears to be conformable with the overlying
Baoqing Member of the Changxing Limestone.
The base of the Changhsingian Stage is defined at the FAD of the conodont species Clarkina wangi within the lineage from Clarkina longicuspidata to Clarkina wangi at the base of Bed 4a-2
The ammonoid Sinoceltites has its first occurrence in the same bed as Clarkina wangi. The first occurrence of the ammonoid Tapashanites is only 42 cm above the GSSP.
Palaeofusulina aff. sinensis has its first appearance together with Clarkina wangi in Bed 4a-2.
Conodont FAD Clarkina wangi
Notes on Derivation of Age:
Permian-Carboniferous time scale is
derived from calibrating a master composite section to selected radiometric
Jin, Y., Wang, Y., Henderson, C., Wardlaw, B. R., Shen, S., and Cao, C., 2006. The Global Boundary Stratotype Section and Point (GSSP) for the base of Changhsingian Stage (Upper Permian). Episodes 29/3, P. 175 - 182.