Knox Supergroup
| Knox Supergroup | |
|---|---|
| Stratigraphic range: Late Cambrian–Dapingian ~ | |
Sphalerite from the Knox Superroup, Tennessee | |
| Type | Supergroup |
| Unit of | Sauk |
| Sub-units |
|
| Underlies | Ancel Group, Wells Creek Dolomite |
| Overlies | |
| Lithology | |
| Primary | Dolomite |
| Other | Limestone and sandstone |
| Location | |
| Region | Indiana, Illinois, Kentucky, New York, Ohio, Pennsylvania, West Virginia |
| Country | United States |
| Type section | |
| Named for | Knox County, Tennessee |
| Named by | Safford (1869, p. 151) |
The Knox Supergroup, also known as the Knox Group and the Knox Formation, is a widespread geologic group in the Southeastern United States. The age is from the Late Cambrian to the Early Ordovician. Predominantly, it is composed of carbonates, chiefly dolomite, with some limestone. There are also cherty inclusions as well as thin beds of sandstone.