Wells Creek Formation and Knox Group (above Copper Ridge Dolomite)

Wells Creek Formation - Gray limestone and dolomite, with angular chert blocks and fragments; and minor shale, mottled red and green, calcareous. Thickness 0 to 50 feet. (Present only in Sequatchie Valley.); and Knox Group (above Copper Ridge Dolomite) - Gray, cherty dolomite and limestone, fine- to medium-grained. Maximum exposed thickness in Sequatchie Valley 600 feet. (Units in Onc are also mapped as OCk on the West-Central Sheet)
State Tennessee
Name Wells Creek Formation and Knox Group (above Copper Ridge Dolomite)
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone
Sedimentary > Carbonate > Limestone
Minor
Sedimentary > Clastic > Mudstone > Shale
Incidental
Sedimentary > Chemical > Chertchert blocks in limestone and dolomite
Comments East-Central sheet
References

Greene, D.C., and Wolfe, W.J., 2000, Superfund GIS - 1:250,000 Geology of Tennessee, USGS, (geo250k).

Hardeman, W.D., Miller, R.A., and Swingle, G.D., 1966, Geologic Map of Tennessee: Division of Geology, Tennessee Department of Environment and Conservation, 4 sheets, scale 1:250,000

NGMDB product
Counties Bledsoe - Marion - Sequatchie