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
Mudcracked limestone (Tyrone Limestone, Black River Group, Middle Ordovician; Frankfort, Kentucky)
TypeGroup
UnderliesLexington Limestone and Trenton Group
OverliesSt. Paul Group and Wells Creek Formation
Location
RegionIllinois, Ohio, Kentucky and West Virginia
CountryUnited States

See also

References

  • Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021. {{cite web}}: |author= has generic name (help)


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