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.