Tan to orange clay, silt, and sand with a large amount of basal gravels.
Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
Light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels.
Red sand and gravel and white clay; may be of Pliocene age; the formation mapped is equivalent to the Willis sand and does not include the terrace deposits, colluvium, and residuum commonly considered "Citronelle".