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.
Brown lignitic clays, silts and sands; some sideritic glauconite may weather to brown ironstone in lower part.
Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
White to light gray massive sands with interbedded clays; some thin beds of lignite or lignitic sands and shales.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels.
Claibourne Group
Alluvial deposits of present streams