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| Bullion Creek Formation Stratigraphic range: Thanetian ~58–55 Ma | |
|---|---|
| Type | Formation |
| Underlies | Sentinel Butte Formation |
| Overlies | Slope and Cannonball formations |
| Location | |
| Region | North Dakota |
| Country | |
The Bullion Creek Formation is a geologic formation in western North Dakota.[1] It preserves bones and tracks of an extinct crocodile and other fossils of Late Paleocene age.[2]