The Ion Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
| Ion Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Location | |
| Region |  Illinois |
| Country |  United States |
See also
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References
edit- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 17 December 2021.
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