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| Ionia Formation | |
|---|---|
| Stratigraphic range: Jurassic | |
| Type | Formation |
| Underlies | Glacial drift |
| Overlies | Grand River Formation |
| Location | |
| Region | 
Michigan |
| Country | 
United States |
The Ionia Formation is a geologic formation in Michigan. It preserves fossils dating back to the Jurassic period.
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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