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Dubuque Formation

From Wikipedia, the free encyclopedia
Dubuque Formation
Stratigraphic range: Ordovician
TypeFormation
UnderliesMaquoketa Formation
OverliesGalena Group
Location
RegionIllinois, Minnesota
Country United States

The Dubuque Formation is a geologic formation in Illinois, Iowa, Wisconsin and Minnesota. It preserves fossils dating back to the Ordovician period.

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