Ordovician Formations including Richmond Group (Mannie Shale, Fernvale Limestone), and Nashville Group (Hermitage Formation)

Ordovician Formations - Richmond Group (including Mannie Shale - Shale with thin beds of argillaceous limestone. Thickness 0 to 20 feet and Fernvale Limestone - Thick-bedded, coarse-grained limestone with vari-colored grains. Thickness 0 to 20 feet and Nashville Group (including Hermitage Formation - Gray shale and thin-bedded to laminated, sandy and argillaceous limestone. Maximum exposed thickness 80 feet.)
State Tennessee
Name Ordovician Formations including Richmond Group (Mannie Shale, Fernvale Limestone), and Nashville Group (Hermitage Formation)
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone
Minor
Sedimentary > Clastic > Mudstone > Shale
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
Counties Decatur - Hardin - Perry - Wayne