Ion Formation

Ion Formation Stratigraphic range: Ordovician
Type	Formation
Location
Region	Illinois
Country	United States

The Ion Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.

See also

• List of fossiliferous stratigraphic units in Illinois

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 22 June 2014.