Huangnitang

Huangnitang, a village in Zhejiang, China, is the location of the Global Boundary Stratotype Section and Point (GSSP) which 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. It was China's first.

The boundary is defined as the first appearance of the graptolite "Undulograptus austrodentatus". The graptolite "Arienigraptus zhejiangensis" appears 0.5 m below this boundary. The rock section is shale.

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