Grant Lake Formation
Stratigraphic range: Late Ordovician
Grant Lake Formation exposed in Boone County, Kentucky.
Type	Formation
Underlies	Arnheim Formation and Bull Fork Formation
Overlies	Fairview Formation
Location
Region	Ohio Kentucky
Country	United States

The Grant Lake Formation is a geologic formation in Ohio and Kentucky. It preserves fossils dating back to the Ordovician period.

• List of fossiliferous stratigraphic units in Ohio
• List of fossiliferous stratigraphic units in Kentucky

• 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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