Brainard Shale

Brainard Shale
Stratigraphic range: Ordovician
TypeFormation
Unit ofMaquoketa Group
UnderliesBrassfield Limestone, Cataract Formation, and Sexton Creek Limestone
OverliesFort Atkinson Limestone
Location
RegionIllinois, Indiana
CountryUnited States

The Brainard Shale is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.