Warsaw Formation

Warsaw Formation Stratigraphic range: Mississippian
Type	Formation
Underlies	Salem Formation
Overlies	Keokuk Limestone
Location
Region	Illinois, Iowa, Missouri
Country	United States
Type section
Named for	Warsaw, Hancock County, Illinois

The Warsaw Formation is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian subperiod.