Geologic units in Cleveland county, Arkansas

Jackson Group (Late Eocene) at surface, covers 35 % of this area

Jackson Group

Alluvium (Holocene) at surface, covers 28 % of this area

Alluvial deposits of present streams

Terrace deposits (Late Pleistocene) at surface, covers 21 % of this area

Alluvial deposits on one or more terrace levels

Claibourne Group (Middle Eocene) at surface, covers 17 % of this area

Claibourne Group