Geologic units in Morgan county, Alabama

Bangor Limestone (Mississippian) at surface, covers 32 % of this area

Medium-gray bioclastic and oolitic limestone, containing interbeds of dusky-red and olive-green mudstone in the upper part.

Hartselle Sandstone (Mississippian) at surface, covers 22 % of this area

Light-colored thick-bedded to massive quartzose sandstone, containing interbeds of dark-gray shale.

Pottsville Formation (lower part) (Pennsylvanian) at surface, covers 20 % of this area

Light-gray thick-bedded to massive pebbly quartzose sandstone, containing varying amounts of interbedded dark-gray shale, siltstone, and thin discontinuos coal. The Boyles Sandstone Member is a formally named unit in the lower part of the formation. Top of unit is mapped at the Black Creek coal.

Tuscumbia Limestone (Mississippian) at surface, covers 14 % of this area

Light-gray limestone, partly oolitic near top; fine to very coarse-grained bioclastic crinoidal limestone common; light-gray chert nodules and concretions are scattered throughout and are abundant locally. The apparent thickness of the formation in this province varies due to differential dissolution of the carbonate in the unit.

Pride Mountain Formation and Monteagle Limestone undifferentiated (Mississippian) at surface, covers 6 % of this area

Light-gray oolitic limestone, argillaceous and in part bioclastic with interbeds of medium to dark-gray shale.

Monteagle Limestone (Mississippian) at surface, covers 5 % of this area

Light-gray oolitic limestone containing interbedded argillaceous, bioclastic, or dolomitic limestone, dolomite, and medium-gray shale.

Pennington Formation (Mississippian) at surface, covers 0.4 % of this area

Medium-gray shale, containing interbedded limestone, dolomite, argillaceous sandstone, dusky-red and grayish-olive mudstone, and minor shaly coal. Mainly restricted to eastern part of Interior Low Plateaus province and where less than 100 feet thick the formation is included in the Bangor Limestone.

Parkwood Formation (Pennsylvanian-Mississippian) at surface, covers 0.1 % of this area

Interbedded medium to dark-gray shale and light to medium-gray sandstone; locally contains dusky-red and grayish-green mudstone, argillaceous limestone, and clayey coal.

Bangor Limestone (Mississippian) at surface, covers < 0.1 % of this area

Medium-gray bioclastic and oolitic limestone, containing interbeds of dusky-red and olive-green mudstone in upper part.