Skip to main content

Red Mountain Formation

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
Primary rock type sandstone
Secondary rock type siltstone
Other rock types shale; limestone; conglomerate
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 > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)minor amounts of bioclastic limestone
Sedimentary > Clastic > Conglomerate (Bed)minor amounts of bioclastic limestone and conglomerate sandstone
Map references
Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
Unit references
Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.