Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.
Light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally.
Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels.
Greenish gray sideritic clay in upper part may weather to brown ironstone; yellow to brown clays and fossiliferous marl in lower part may weather to black soil. Ironstone concretions near base.
White to light gray massive sands with interbedded clays; some thin beds of lignite or lignitic sands and shales.
Brown silty clay with basal glauconitic, fossiliferous silts which may weather to ironstone locally.
Gray to brown lignitic sands and silty to sandy lignitic clays, many seams of lignite; some limestone and glauconite.
Tan to orange clay, silt, and sand with a large amount of basal gravels.
Alluvial deposits on one or more terrace levels
Alluvial deposits of present streams
Claibourne Group