| Huangnitang | |
| Settlement Type: | Village |
| Coordinates: | 28.9167°N 118.5322°W |
| Pushpin Map: | China Zhejiang |
| Pushpin Map Caption: | Location in Zhejiang |
| Subdivision Type: | Country |
| Subdivision Name: | People's Republic of China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Zhejiang |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Quzhou |
| Subdivision Type3: | County |
| Subdivision Name3: | Changshan County |
| Subdivision Type4: | Subdistrict |
| Subdivision Type5: | Village |
| Subdivision Name5: | Zhoutang |
Huangnitang is a village of Zhoutang village (Chinese: {{linktext|周塘|村), Tianma Subdistrict (Chinese: {{linktext|天马|街道), Changshan County, Quzhou, Zhejiang Province, China.[1] [2] [3] 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.
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.