Red Mountain Formation

Dark-reddish-brown to olive-gray partly fossiliferous, mostly fine-grained sandstone interbedded with siltstone and shale; minor amounts of bioclastic limestone and conglomerate sandstone; includes hematitic beds and beds of ferruginous sandstone, outcrops in northeastern AL are finer grained and include more limestone.
State Alabama
Name Red Mountain Formation
Geologic age Silurian
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)dark-reddish-brown to olive-gray partly fossiliferous, mostly fine-grained sandstone; includes hematitic beds and beds of ferruginous sandstone
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Incidental
Sedimentary > Clastic > Conglomerate (Bed)minor amounts of bioclastic limestone and conglomerate sandstone
Sedimentary > Carbonate > Limestone (Bed)minor amounts of bioclastic limestone
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 Bibb - Cherokee - Etowah - Jefferson - Saint Clair - Tuscaloosa