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The Pecatonica Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
This article needs additional citations for verification. (October 2017) |
Pecatonica Formation | |
---|---|
Stratigraphic range: Ordovician | |
Type | Formation |
Unit of | Black River Group |
Underlies | Plattin Formation |
Overlies | Joachim Dolomite |
Lithology | |
Primary | Limestone |
Location | |
Region | Illinois, Indiana, Iowa and Wisconsin |
Country | United States |
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