Xiagou Formation
The Xiagou Formation is the middle strata of the Xinminbao Group. It is named for its type site in Xiagou, in the Changma Basin of Gansu Province, northwestern China and is considered Early Cretaceous in age. It is known outside the specialized world of Chinese geology as the site of a Lagerstätte in which the fossils were preserved of Gansus yumenensis, the earliest true modern bird.
| Xiagou Formation | |
|---|---|
| Stratigraphic range: late Aptian ~ | |
| Type | Geological formation |
| Unit of | Xinminbao Group |
| Underlies | Zhonggou Formation |
| Overlies | Chijinpu Formation |
| Lithology | |
| Primary | Mudstone |
| Other | Shale, siltstone |
| Location | |
| Coordinates | 39.9°N 96.8°E |
| Approximate paleocoordinates | 39.1°N 97.5°E |
| Region | Gansu |
| Country | China |
| Extent | Changma Basin |
| Type section | |
| Named for | Xiagou |
Xiagou Formation (China) | |
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