Geologic units in Saint Francis county, Arkansas

Terrace deposits (Late Pleistocene) at surface, covers 43 % of this area

Alluvial deposits on one or more terrace levels

Alluvium - Alluvial deposits in major stream channels or in mappable meanders of major streams (Holocene) at surface, covers 34 % 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.

Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (Holocene) at surface, covers 14 % 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

Loess (Early Pleistocene) at surface, covers 7 % of this area

Loess

Sand and gravel (Early Pleistocene) at surface, covers 2 % of this area

Sand and gravel

Claibourne Group (Middle Eocene) at surface, covers 0.5 % of this area

Claibourne Group