State | Alabama |
---|---|
Name | Selma Group; Blufftown Formation |
Geologic age | Cretaceous |
Lithologic constituents |
Major
Unconsolidated > Fine-detrital > Claymicaceous clay, fossiliferous clay, carbonaceous clay, sandy clay, calcareous clay.
Unconsolidated > Coarse-detrital > Sandglauconitic calcareous fine sand, gravelly sand, glauconitic sand, micaceous silty fine sand
Minor
Unconsolidated > Marlmicaceous clay and marl
Unconsolidated > Fine-detrital > Siltcarbonaceous clay and silt, micaceous silty fine sand
Sedimentary > Clastic > Sandstone (Calcareous)gray calcareous fossiliferous sandstone
Incidental
Sedimentary > Carbonate > Limestone (Bed)thin layers of limestone
|
Comments | Note: Printed map uses unit symbol 'Kb'; digital map uses 'KRb'. |
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 | Barbour - Bullock - Macon - Russell |