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.
Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels.
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.
Light gray, tan and brown fine to coarse sand; some clay silt and gravel.
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. Overlain by 1-9 meters of loess.