Brown lignitic clays, silts and sands; some sideritic glauconite may weather to brown ironstone in lower part.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels.
Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
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.
Tan to orange clay, silt, and sand with a large amount of basal gravels.
White to light gray massive sands with interbedded clays; some thin beds of lignite or lignitic sands and shales.
Light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally.
Light gray to brown liginitic clays with thin interbeds of limonitic sands or lignite; near base,calcareous, glauconitic, and fossiliferous beds may weather to black soil.
Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.