The Grand Detour 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". 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.

• v
• t
• e