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.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels. Overlain by 1-9 meters of loess.
Light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally.