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