The Ionia Formation is a geologic formation in Michigan. It preserves fossils dating back to the Jurassic period.

Ionia Formation
Stratigraphic range: Jurassic
TypeFormation
UnderliesGlacial drift
OverliesGrand River Formation
Location
Region Michigan
Country United States

References

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