GSSP for Wuchiapingian Stage
Definition:
The Base of the Lopingian Series and Wuchiapingian Stage is defined at
the base of Bed 6k in the Penglaitan Section along the Hongshui River
in Guanxi Province, South China. The GSSP coincides with the first
appearance of the conodont Clarkina postbitteri postbitteri
within an evolutionary linage from Clarkina postbitteri
hongshuiensis to Clarkina dukouensis.
Location:
The GSSP Section is located in southern China, about 20km east from the county
town of Laibin along the southern bank of the Hongshui River near the rocky
islet named Penglaitan at a latitude of 23°41'43" N and a longitude of
109°19'16"E.
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Sedimentology:
The GSSP is located in the upper Member of the Maokou Formation. This
8m thick Laibin Limestone is overlain by 250m of chert and lenticular
limestone of the Heshan Formation. The GSSP is defined at the base of
Bed 6k in the Laibin Limestone. This rock consists of thick-bedded
crinoidal grainstone and lenticular packstone.
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Primary Markers:
The GSSP is marked by the first appearance of the conodont Clarkina
postbitteri postbitteri within an evolutionary linage from
Clarkina postbitteri hongshuiensis to Clarkina
dukouensis.
Correlation Events:
Conodont FAD Clarkina postbitteri postbitteri
References:
Jin, Y., Shen, S., Henderson, C. M., Wang, X., Wang, W., Wang, Y., Cao, C., and
Shang, Q., 2006. The Global Stratotype Section and Point (GSSP) for the boundary
between the Capitanian and Wuchiapingian Stage (Permian). Episodes 29/4, p. 253
- 262.
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