Dabeigou Formation
| Dabeigou Formation | |
|---|---|
| Stratigraphic range: mid Valanginian-mid Hauterivian ~ | |
| Type | Geological formation |
| Unit of | Jehol Biota |
| Sub-units | Numbered Members |
| Underlies | Dadianzi & Yixian Formations |
| Overlies | Zhangjiakou Formation |
| Thickness | Varies, in Yushuxia section 220 metres (720 ft) |
| Lithology | |
| Primary | Sandstone, mudstone |
| Other | Tuffite, conglomerate, siltstone |
| Location | |
| Coordinates | 41°42′N 116°24′E / 41.7°N 116.4°E |
| Approximate paleocoordinates | 43°36′N 118°30′E / 43.6°N 118.5°E |
| Region | Hebei |
| Country | China |
The Dabeigou Formation (simplified Chinese: 大北沟组; traditional Chinese: 大北溝組; pinyin: Dàběigōu zǔ) is a palaeontological formation located in Hebei, China. It dates from the mid Valanginian to Hauterivian age of the Cretaceous period, approximately 135 to 130 Ma.