Brainard Shale Explained

Brainard Shale
Type:Formation
Age:Ordovician
Period:Ordovician
Region:Illinois, Indiana
Country:United States
Unitof:Maquoketa Group
Underlies:Brassfield Limestone, Cataract Formation, and Sexton Creek Limestone
Overlies:Fort Atkinson Limestone

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

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