Cummingsville Formation
| 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 | |
| Region | Iowa and Minnesota |
| Country | United States |
The Cummingsville Formation is a geologic formation in Iowa and Minnesota. It preserves fossils dating back to the Ordovician period.
...
Wikipedia