Geologic units in Weakley county, Tennessee

Additional scientific data in this geographic area

Loess (Quaternary) at surface, covers 86 % of this area

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.)

Alluvial deposits (Quaternary) at surface, covers 10 % of this area

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.

Claiborne and Wilcox Formation (Tertiary) at surface, covers 4 % of this area

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 (Tertiary to Quaternary) at surface, covers 0.1 % of this area

Continental deposits and loess, undifferentiated; West of the Tennessee River

Jackson and Claiborne Formations, undivided (Tertiary) at surface, covers 0.1 % of this area

Jackson and Claiborne Formations, undivided; includes some rocks of Oligocene age

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

Alluvium; includes glacial deposits along the Ohio River and its tributaries west of Cannelton locks