Estill Shale
| Estill Shale | |
|---|---|
| Stratigraphic range: Silurian | |
| Type | Formation | 
| Underlies | Bisher Formation | 
| Overlies | Drowning Creek Formation | 
| Location | |
| Country | United States | 
| Extent | Ohio | 
The Estill Shale is a geologic formation in Ohio. It dates back to the Silurian.
References