Knox Supergroup

Knox Supergroup
Knox Supergroup
Stratigraphic range: ; Late Cambrian-Dapingian ; ~
	Sphalerite from the Knox Superroup, Tennessee
Type	Supergroup
Unit of	Sauk
Sub-units	Kentucky Everton Dolomite; Cotter Dolomite; Beekmantown Group Jefferson City Dolomite; Roubidoux Formation; Gasconade Dolomite; Gunter Sandstone; ; Copper Ridge Dolomite; Ohio, West Virginia and Eastern Kentucky Beekmantown Dolomite; Rose Run Formation; Copper Ridge Dolomite; Pennsylvania Beekmantown Group Bellefonte Formation; Nittany Dolomite; Stonehenge Dolomite; ; Chepultepec Dolomite; Copper Ridge Dolomite; Indiana and Illinois Everton Dolomite; Prairie do Chien Group Shakopee Dolomite; New Richmond Sandstone; Oneota Dolomite; ; Potosi Dolomite; Other Gunter Formation/Rose Run Formation; Copper Ridge Dolomite Shakopee Dolomite; Oneota Dolomite; ;
Underlies	Ancel Group, Wells Creek Dolomite
Overlies	Eau Claire Formation; Conasauga Group;
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.

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