Black River Group

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Black River Group
Stratigraphic range: Late Ordovician
UnderliesLexington Limestone and Trenton Group
OverliesSt. Paul Group and Wells Creek Formation
RegionIllinois, Ohio, and West Virginia
CountryUnited States

The Black River Group is a geologic group in Illinois and West Virginia. It preserves fossils dating back to the Ordovician period.

See also[edit]


  • Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.