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.
Alluvial deposits on one or more terrace levels
Loam, sand, gravel, and clay; mapped only in Mississippi River Alluvial Plain.
Light gray, tan and brown fine to coarse sand; some clay silt and gravel. Overlain by 1-9 meters of loess.
Light gray, tan and brown fine to coarse sand; some clay silt and gravel.
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.