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. Overlain by 1-9 meters of loess.
Gray to black clay of very high organic content, some peat.
Gray to brown to black clay and silt of high organic content.
Gray to brown to black clay and silt of moderate organic content.
Light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally. Overlain by 1-9 meters of loess.
Gray to black clay of very high organic content, some peat.