| Clays Ferry Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation | 
| Underlies | Garrard Siltstone | 
| Overlies | Lexington Limestone | 
| Location | |
| Region | Ohio | 
| Country | United States | 
The Clays Ferry Formation is a geologic formation in Ohio and Kentucky. It preserves fossils dating back to the Ordovician period, especially rafinesquina.