Midway Group including Porters Creek Clay and Clayton Formation (TNTm;1)

Midway Group including Porters Creek Clay and Clayton Formation

Midway Group - includes Porters Creek Clay - Pale-brown to brownish-gray, massive, blocky clay; locally contains glauconitic sand. Thickness 130 to 170 feet. Also includes Clayton Formation- Glauconitic sand, argillaceous and locally fossiliferous; at base in Hardeman County is an impure fossiliferous limestone. Thickness 30 to 70 feet.

State	Tennessee
Name	Midway Group including Porters Creek Clay and Clayton Formation
Geologic age	Tertiary
Lithologic constituents	Major Unconsolidated > Fine-detrital > Clayglauconitic clay Minor Unconsolidated > Coarse-detrital > Sandglauconitic sand, locally fossiliferous Incidental Sedimentary > Carbonate > Limestoneimpure fossiliferous limestone
Comments	West 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	NGMDB product page for 91768
Counties	Carroll - Chester - Hardeman - Henderson - Henry - McNairy - Madison

Midway Group including Porters Creek Clay and Clayton Formation

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