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| Potosi Formation Stratigraphic range: Cambrian | |
|---|---|
Fossil from the Potosi Dolomite | |
| Type | Formation |
| Underlies | Eminence Dolomite and Oneota Dolomite |
| Overlies | Davis Formation,[1] Derby-Doerun Dolomite,[2] and Franconia Formation |
| Location | |
| Coordinates | [ ⚑ ] : 38°05′30″N 90°41′07″W / 38.091733°N 90.685176°W |
| Region | Illinois, Indiana , Missouri |
| Country | United States |
The Potosi Formation is a geologic formation in Missouri, Illinois and Indiana . It preserves fossils dating back to the Cambrian period.