Dubuque Formation

Dubuque Formation
Stratigraphic range: Ordovician
TypeFormation
UnderliesMaquoketa Formation
OverliesGalena Group
Location
RegionIllinois, Minnesota
CountryUnited States

The Dubuque Formation is a geologic formation in Illinois, Iowa, Wisconsin and Minnesota. It preserves fossils dating back to the Ordovician period. It comprises carbonate and argillaceous rocks that are between 35 and 45 feet deep.

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