Clayey and sandy silt, gray to brown, massive. Maximum thickness about 100 feet along bluffs of Mississippi River; thins eastward. (Minimum mapped thickness 4 feet.)
Sand, silt, clay, and gravel. In flood plain of Mississippi River more than 100 feet thick; in smaller streams generally less than 20 feet thick.
Irregularly bedded sand, locally interbedded with lenses and beds of gray to white clay, silty clay, lignitic clay, and lignite. Thickness more than 400 feet.
Continental deposits and loess, undifferentiated; West of the Tennessee River
Jackson and Claiborne Formations, undivided; includes some rocks of Oligocene age
Alluvium; includes glacial deposits along the Ohio River and its tributaries west of Cannelton locks