Geologic units in Claiborne county, Mississippi

Catahoula formation (Miocene) at surface, covers 93 % of this area

Irregularly bedded gray sand and sandstone; mottled red and gray, green, and chocolate-colored clay; some quartzite, and some gravel; the Paynes Hammock sand, sandy limestone cross-bedded fine green sand, and thin-bedded sand and clay, is mapped with the underlying Chickasawhay limestone in eastern MS.

Alluvium (Holocene) at surface, covers 6 % of this area

Loam, sand, gravel, and clay; mapped only in Mississippi River Alluvial Plain.

Natural Levees (Holocene) at surface, covers < 0.1 % of this area

Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.

Alluvium (Holocene) at surface, covers < 0.1 % of this area

Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.

Vicksburg group and Chickasawhay limestone (Oligocene) at surface, covers < 0.1 % of this area

Chickasawhay limestone, sandy limestone, and sand, present only in eastern MS (mapped with it is the overlying Paynes Hammock sand of Miocene age); Vicksburg group, predominantly limestone and marl, but contains some bentonite and near the top, chocolate-colored clay and some sand.