Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.
Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
Light gray, tan and brown fine to coarse sand; some clay silt and gravel.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels. Overlain by 1-9 meters of loess.
Gray mixed with brown-to-red clay and silty clay; some sand and gravel locally.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels.
Alluvial deposits on one or more terrace levels
Alluvial deposits of present streams
Alluvial deposits of local streams or of overbank flow of major streams - In some areas includes deposits in abandoned meanders of major streams
Alluvial deposits in major stream channels or in mappable meanders of major streams - Includes alluvial deposits in natural levees in some areas.