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 orange-brown clay, sandy clay, and silt; much sand and gravel locally.
Gray to brown to black clay and silt of high organic content.
Gray mixed with brown-to-red clay and silty clay; some sand and gravel locally.
Gray to brown to black clay and silt of moderate organic content.
Alluvium
Deweyville Formation
Fill and spoil
Beaumont Formation, areas predominantly clay
Beaumont Formation, areas predominantly sand