Geologic units in Roosevelt county, New Mexico

Older alluvial deposits of upland plains and piedmont areas, and calcic soils and eolian cover sediments of High Plains region (Middle to lower Pleistocene) at surface, covers 42 % of this area

Includes scattered lacustrine, playa, and alluvial deposits of the Tahoka, Double Tanks, Tule, Blanco, Blackwater Draw, and Gatuna Formations, the latter of which may be Pliocene at base; outcrops, however, are basically of Quaternary deposits.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 32 % of this area

Alluvial and eolian deposits, and petrocalcic soils of the southern High Plains. Locally includes Qoa.

Eolian deposits (Holocene to middle Pleistocene) at surface, covers 19 % of this area

Eolian deposits.

Lacustrine and playa-lake deposits (Holocene) at surface, covers 2 % of this area

Includes associated alluvial and eolian deposits of major lake basins.

Upper Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) at surface, covers 2 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 1 % of this area

Includes deposits of higher gradient tributaries bordering major stream valleys, alluvial veneers of the piedmont slope, and alluvial fans. May locally include uppermost Pliocene deposits.

Alluvium (Holocene to upper Pleistocene) at surface, covers 0.7 % of this area

Alluvium

Eolian and piedmont deposits (Holocene to middle Pleistocene) at surface, covers 0.7 % 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.

Cretaceous rocks, undivided (Cretaceous) at surface, covers 0.3 % of this area

Cretaceous rocks, undivided

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

Blackwater Draw Formation

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

Sand deposits, undivided

Playa (Quaternary) at surface, covers < 0.1 % of this area

Playa

Ogallala Formation (Pliocene to Miocene) at surface, covers < 0.1 % of this area

Ogallala Formation

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

Sand dune deposits

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

Sand sheet deposits