Geologic units in DeBaca county, New Mexico

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 33 % 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.

Artesia Group (Guadalupian) at surface, covers 19 % of this area

Shelf facies forming broad south-southeast trending outcrop from Glorieta to Artesia area; includes Tansill, Yates, Seven Rivers, Queen and Grayburg Formations (Guadalupian). May locally include Moenkopi Formation (Triassic) at top.

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 12 % 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.

Alluvium (Holocene to upper Pleistocene) at surface, covers 9 % of this area

Alluvium

Upper Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) at surface, covers 6 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

Eolian and piedmont deposits (Holocene to middle Pleistocene) at surface, covers 6 % 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.

Santa Rosa Formation (Carnian) at surface, covers 4 % of this area

Includes Moenkopi Formation (Middle Triassic) at base in most areas.

Eolian deposits (Holocene to middle Pleistocene) at surface, covers 4 % of this area

Eolian deposits.

San Andres Formation (Guadalupian and Leonardian) at surface, covers 4 % of this area

Limestone and dolomite with minor shale. Guadalupian in south, in part Leonardian to north.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 2 % of this area

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

Garita Creek Formation (Carnian) at surface, covers 0.6 % of this area

Garita Creek Formation

Yates and Tansill Formations (Guadalupian) at surface, covers 0.1 % of this area

Sandstone, siltstone, limestone, dolomite, and anhydrite.

Queen and Grayburg Formations (Guadalupian) at surface, covers < 0.1 % of this area

Sandstone, gypsum, anhydrite, dolomite, and red mudstone.

Trujillo Formation (Norian) at surface, covers < 0.1 % of this area

Trujillo Formation

Lacustrine and playa-lake deposits (Holocene) at surface, covers < 0.1 % of this area

Includes associated alluvial and eolian deposits of major lake basins.

Seven Rivers Formation (Guadalupian) at surface, covers < 0.1 % of this area

Gypsum, anhydrite, salt, dolomite, and siltstone.