Geologic units in Desha county, Arkansas

Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (Holocene) at surface, covers 57 % of this area

Alluvial deposits of local streams or of overbank flow of major streams - In some areas includes deposits in abandoned meanders of major streams

Alluvium - Alluvial deposits in major stream channels or in mappable meanders of major streams (Holocene) at surface, covers 39 % of this area

Alluvial deposits in major stream channels or in mappable meanders of major streams - Includes alluvial deposits in natural levees in some areas.

Terrace deposits (Late Pleistocene) at surface, covers 3 % of this area

Alluvial deposits on one or more terrace levels

Alluvium (Holocene) at surface, covers 0.5 % of this area

Loam, sand, gravel, and clay; mapped only in Mississippi River Alluvial Plain.