Sentinel Butte Formation | |
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Stratigraphic range: Thanetian ~58–55 Ma ↓ | |
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Bentonite (Big Blue Bentonite) in the Sentinel Butte Formation (North Dakota)
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Type | Formation |
Unit of | Fort Union Formation |
Underlies | Golden Valley Formation |
Overlies | Bullion Creek Formation |
Location | |
Region | North Dakota |
Country | ![]() |
The Sentinel Butte Formation is a geologic formationofPaleocene age in the Williston Basin of western North Dakota.[1] It preserves significant assemblages of non-marine plant and animal fossils.
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