| Tioga Ash Beds | |
|---|---|
| Stratigraphic range: Lochkovian-Eifelian ~ | |
| Type | Geological formation |
| Unit of | Helderberg Group, Onondaga Limestone and Marcellus Shale |
| Sub-units | Bald Hill, Sprout Brook, Tioga Middle Course Zone, and Tioga A-G |
| Lithology | |
| Primary | Tuff |
| Location | |
| Region |  Indiana,  Illinois,  Maryland,  Michigan,  New York,  Ohio,  Pennsylvania,  Tennessee,  Virginia and  West Virginia |
| Country |  United States |
| Extent | Appalachian Basin, Illinois Basin and Michigan Basin of eastern North America |
| Type section | |
| Named for | Tioga Gas Fields |
| Named by | Ebright, Fettke, and Ingham |
The Tioga Bentonites are a series of ash bed layers occurring in three Sedimentary basins in the eastern and midwestern United States. The primary basin they are found in is the Appalachian Basin, as well as the Illinois Basin and the Michigan Basin. Due to an unconformity these ash beds are not present in the southern Appalachians.[1]
- ^ Dennison, J. M. (November 1, 1986). "Tioga Bentonite in the Appalachian basin: Final report". OSTI 7057656.
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