Iola Formation
Stratigraphic range: Carboniferous
Fossiliferous limestone (Raytown Member, Iola Formation; Elk County, Kansas)
Type	Formation
Unit of	Kansas City Group
Sub-units	Raytown Member
Location
Region	Illinois  Oklahoma  Kansas  Iowa
Country	United States

The Iola Formation is a geologic formation in Illinois and Oklahoma. It preserves fossils dating back to the Carboniferous period.

• List of fossiliferous stratigraphic units in Illinois

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 17 December 2021.

This article about a specific stratigraphic formation in Illinois is a stub. You can help Wikipedia by expanding it.

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