Black River Group
The Black River Group is a geologic group in Illinois and West Virginia. It preserves fossils dating back to the Ordovician period.
| Black River Group Stratigraphic range: Late Ordovician | |
|---|---|
_1.jpg.webp) Mudcracked limestone (Tyrone Limestone, Black River Group, Middle Ordovician; Frankfort, Kentucky) | |
| Type | Group |
| Underlies | Lexington Limestone and Trenton Group |
| Overlies | St. Paul Group and Wells Creek Formation |
| Location | |
| Region | Illinois, Ohio, Kentucky and West Virginia |
| Country | United States |
See also
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.
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