Warsaw Formation

The Warsaw Formation is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian subperiod. Brachiopod, bryozoan, and crinoid fossils are common, particularly the bryozoan Archimedes.^[2]

TypeFormation

UnderliesSalem Formation

OverliesKeokuk Limestone^[1]

RegionIllinois, Iowa, Missouri

Quick facts Type, Underlies ...

Warsaw Formation
Stratigraphic range: Mississippian
Geode from the Warsaw Formation (Warsaw, Hancock County, Illinois)
Type	Formation
Underlies	Salem Formation
Overlies	Keokuk Limestone[1]
Location
Region	Illinois, Iowa, Missouri
Country	United States
Type section
Named for	Warsaw, Hancock County, Illinois[1]

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