| Xiguayuan Formation | |
| Type: | Geological formation |
| Age: | Barremian ~ |
| Period: | Barremian |
| Prilithology: | Conglomerate, sandstone, siltstone, mudstone |
| Otherlithology: | Volcanic and pyroclastic sediments |
| Region: | Hebei |
| Country: |  China |
| Coordinates: | 45.9°N 117.3°W |
| Paleocoordinates: | 48.8°N 117.4°W |
| Underlies: | Quaternary sediments |
| Overlies: | Zhangjiakou Formation |
| Thickness: | Up to 2500m (8,200feet) |
The Xiguayuan Formation is an Early Cretaceous (Barremian) geologic formation in Hebei Province of China. Fossil ornithopod tracks have been reported from the formation.[1] It was deposited in a shallow lacustrine setting and is noted for its hyperpycnite facies.[2]
The formation has provided the following fossils: