Cummingsville Formation
The Cummingsville Formation is a geologic formation in Iowa and Minnesota. It preserves fossils dating back to the Ordovician period.
| Cummingsville Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
Cummingsville Formation in Decorah, Iowa. The Cummingsville is the brown upper unit; the Decorah Shale is below. | |
| Type | Formation |
| Overlies | Decorah Shale |
| Location | |
| Country | United States |
| Extent | Iowa and Minnesota |
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