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Selma Group; Mooreville Chalk

Mooreville Chalk - (Selma Group), Yellowish-gray to olive-gray compact fossiliferous clayey chalk and chalky marl. The unconformable contact at the base is characterized by a bed of glauconitic, chalky sand containing phosphate pellets and molds of fossils. The Arcola Limestone Member at the top consists of two to four beds of light-gray brittle, dense, fossiliferous limestone separated by beds of light-gray to pale-olive calcareous clay.
State Alabama
Name Selma Group; Mooreville Chalk
Geologic age Cretaceous
Primary rock type carbonate
Secondary rock type mixed clastic/carbonate
Other rock types sand; limestone; clay or mud
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone > ChalkYellowish-gray to olive-gray compact fossiliferous clayey chalk and chalky marl.
Unconsolidated > Marlchalky marl.
Minor
Unconsolidated > Coarse-detrital > Sand (Bed)The unconformable contact at the base is characterized by a bed of glauconitic, chalky sand containing phosphate pellets and molds of fossils.
Sedimentary > Carbonate > Limestone (Bed)The Arcola Limestone Member at the top consists of two to four beds of light-gray brittle, dense, fossiliferous limestone .
Unconsolidated > Fine-detrital > Clay (Bed)The Arcola Limestone Member at the top consists of two to four beds of light-gray brittle, dense, fossiliferous limestone seperated by beds of light-gray to pale-olive calcareous clay.
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.
Counties Autauga - Bullock - Dallas - Elmore - Greene - Hale - Lowndes - Macon - Marengo - Montgomery - Perry - Pickens - Russell - Sumter