Black River Group
| Black River Group Stratigraphic range: Ordovician | |
|---|---|
| Type | Group |
| Location | |
| Region |
 Illinois |
| Country |
 United States |
The Black River Group is a geologic group in Illinois. It preserves fossils dating back to the Ordovician period.
See also
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 22 June 2014.
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