Geologic units in Jefferson county, Arkansas

Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (Holocene) at surface, covers 42 % 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 23 % 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.

Jackson Group (Late Eocene) at surface, covers 16 % of this area

Jackson Group

Terrace deposits (Late Pleistocene) at surface, covers 15 % of this area

Alluvial deposits on one or more terrace levels

Alluvium (Holocene) at surface, covers 4 % of this area

Alluvial deposits of present streams

Claibourne Group (Middle Eocene) at surface, covers 0.3 % of this area

Claibourne Group