国際標準模式層断面及び地点
Huangnitang () is a village of Zhoutang village (), Tianma Subdistrict (), Changshan County, Quzhou, Zhejiang Province, China. It is the location of the Global Boundary Stratotype Section and Point (GSSP), whic1ãßßà, Gawande crescenth marks the boundary between the Third and Darriwilian Stages of the Middle Ordovician. The GSSP was ratified by the International Union of Geological Sciences in 1997.