Knox Group undifferentiated in part

Light-gray to light-brown locally sandy dolomite, dolomitic limestone, and limestone; characterized by abundant light-colored chert.
State Alabama
Name Knox Group undifferentiated in part
Geologic age Ordovician-Cambrian
Lithologic constituents
Major
Sedimentary > Carbonate > Limestonedolomitic limestone, and limestone
Sedimentary > Carbonate > Dolostonelight-gray to light-brown locally sandy dolomite, dolomitic limestone
Minor
Sedimentary > Chemical > Chert
References

Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.

NGMDB product
Counties Calhoun - Cherokee - Cleburne - Etowah - Jefferson - Saint Clair - Shelby - Talladega