Geologic units in Winkler county, Texas

Sand sheet deposits (Holocene) at surface, covers 40 % of this area

Sand sheet deposits

Sand deposits, undivided (Holocene) at surface, covers 32 % of this area

Sand deposits, undivided

Caliche deposits (Pleistocene and Holocene) at surface, covers 12 % of this area

Caliche deposits

Dune sand sheet deposits (Holocene) at surface, covers 10 % of this area

Dune sand sheet deposits

Quaternary deposit, undivided (Quaternary) at surface, covers 2 % of this area

Quaternary deposit, undivided

Alluvium (Holocene) at surface, covers 1.0 % of this area

Alluvium

Maxon Sandstone and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers 0.7 % of this area

Maxon Sandstone and Glen Rose Limestone, undivided

Fredericksburg Group (Early Cretaceous; Comanchean Series) at surface, covers 0.5 % of this area

Fredericksburg Group

Blackwater Draw Formation (Pleistocene) at surface, covers 0.2 % of this area

Blackwater Draw Formation

Ogallala Formation (Pliocene to Miocene) at surface, covers 0.2 % of this area

Ogallala Formation

Sand dune deposits (Holocene) at surface, covers 0.1 % of this area

Sand dune deposits

Leona Formation (Pleistocene) at surface, covers < 0.1 % of this area

Leona Formation

Pond deposits (Pleistocene) at surface, covers < 0.1 % of this area

Pond deposits

Dockum Group, undivided (Late Triassic) at surface, covers < 0.1 % of this area

Dockum Group

Eolian and piedmont deposits (Holocene to middle Pleistocene) at surface, covers < 0.1 % of this area

Interlayered eolian sands and piedmont-slope deposits along the eastern flank of the Pecos River valley, primarily between Roswell and Carlsbad. Typically capped by thin eolian deposits.