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