Benton Shale
| Benton Shale Stratigraphic range: Cretaceous |
|
|---|---|
| Type | Formation |
| Underlies | Niobrara Formation |
| Overlies | Dakota Sandstone |
| Lithology | |
| Primary | Shale |
| Other | Limestone, sandstone, bentonite |
| Location | |
| Region | Montana, Wyoming, North Dakota, South Dakota, Colorado, Nebraska |
| Country | United States |
| Type section | |
| Named for | Fort Benton, Montana |
The Benton Shale is a geologic formation in Montana, Wyoming, North Dakota, South Dakota, Colorado and Nebraska. It preserves fossils dating back to the Cretaceous Period.
It derives its name from Fort Benton, a small city in Montana on the Upper Missouri River.
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Wikipedia