Cannonball Formation
The Cannonball Formation is a geologic formation in western North Dakota. It preserves fossils dating back to the Paleogene Period.
| Cannonball Formation | |
|---|---|
| Stratigraphic range: Paleogene | |
| Type | Formation |
| Underlies | Bullion Creek Formation, Slope Formation |
| Overlies | Hell Creek Formation, Ludlow Formation |
| Location | |
| Region | North Dakota |
| Country | United States |
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