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Geologic units in Craighead county, Arkansas

Terrace deposits (Late Pleistocene) at surface, covers 77 % of this area

Alluvial deposits on one or more terrace levels

Silt and sand (Early Pleistocene) at surface, covers 12 % of this area

Contains lenses of gravel and clay

Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (Holocene) at surface, covers 7 % 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

Dune sand (Late Pleistocene) at surface, covers 3 % of this area

Deposited mostly on terrace deposits of the second level. Younger than some terrace deposits, older than others

Wilcox Group (Early Eocene) at surface, covers 0.3 % of this area

Wilcox Group

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

Claibourne Group

Sand and gravel (Early Pleistocene) at surface, covers < 0.1 % of this area

Sand and gravel

Holocene series (Quaternary-Holocene Series) at surface, covers < 0.1 % of this area

Alluvium - clay, silt, sand, and gravel.