Huangnitang (simplified Chinese: 黄泥塘; traditional Chinese: 黃泥塘; pinyin: Huángnítáng) is a village in Zhejiang province, China. It 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.
- "Earth's History Imbedded in Rocks". June 21, 2006. Retrieved 2006-06-30.
- Ogg, James. "GSSP for the Base of the Darriwilian Stage". Archived from the original on 2006-06-18. Retrieved 2006-06-30.
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