Tully Formation
The Tully Formation is a geologic unit in the Appalachian Basin. The Tully was deposited as a carbonate rich mud, in a shallow sea at the end of the Middle Devonian. Outcrops for the Tully are found in New York State and Pennsylvania. It is also found subsurface in western Maryland and northern West Virginia. A number of fossil remains from marine organisms maybe found in Tully out crops.
| Tully Formation | |
|---|---|
| Stratigraphic range: Devonian | |
Tully Formation at Taughannock Falls State Park | |
| Type | Formation |
| Sub-units |
|
| Underlies | Harrell Shale/Genesee Group |
| Overlies | Hamilton Group |
| Lithology | |
| Primary | Limestone |
| Other | Shale, Siltstone, and Sandstone |
| Location | |
| Region | Maryland New York Pennsylvania West Virginia |
| Country | United States Canada |
| Type section | |
| Named for | Tully, NY |
| Named by | Vanuxem (1839) |
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