Geologic units in Quay county, New Mexico

Alluvium (Holocene to upper Pleistocene) at surface, covers 23 % of this area

Alluvium

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 19 % 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.

Bull Canyon Formation (Norian) at surface, covers 13 % of this area

Bull Canyon Formation

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 12 % 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.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 10 % 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 7 % of this area

Eolian deposits.

Upper Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) at surface, covers 5 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

Upper and lower Cretaceous rocks of east-central and northeast New Mexico (Cenomanian and Albian) at surface, covers 3 % of this area

Consists of Dakota Group, which includes Romeroville Sandstone (Cenomanian), Pajarito Shale, and Mesa Rica Sandstone (Albian); the underlying Tucumcari Shale (Albian) in Tucumcari area and Glencairn Formation (Albian) in Union County.

Morrison Formation (Upper Jurassic) at surface, covers 3 % of this area

Upper Jurassic nonmarine rocks.

Trujillo Formation (Norian) at surface, covers 2 % of this area

Trujillo Formation

San Rafael Group (Middle Jurassic) at surface, covers 1 % of this area

Consists of Entrada Sandstone, Todilto and Summerville Formations, Bluff Sandstone, and locally Zuni Sandstone (or only Acoma Tongue of Zuni).

Upper and Middle Jurassic rocks, undivided (Upper and Middle Jurassic) at surface, covers 0.8 % of this area

In southwest includes the basalt-bearing Broken Jug Formation.

Lacustrine and playa-lake deposits (Holocene) at surface, covers 0.5 % of this area

Includes associated alluvial and eolian deposits of major lake basins.

Garita Creek Formation (Carnian) at surface, covers 0.4 % of this area

Garita Creek Formation

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

Cretaceous rocks, undivided

Redonda Formation (Upper Triassic) at surface, covers 0.2 % of this area

Redonda Formation

Entrada Sandstone (Middle Jurassic) at surface, covers < 0.1 % of this area

Entrada Sandstone

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

Ogallala Formation

Tecovas Formation (Late Triassic) at surface, covers < 0.1 % of this area

Tecovas Formation

Chinle Formation (Late Triassic) at surface, covers < 0.1 % of this area

Chinle Formation

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

Sand deposits, undivided

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

Dune sand sheet deposits

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

Trujillo Formation

Caliche deposits (Pleistocene and Holocene) at surface, covers < 0.1 % of this area

Caliche deposits

Terrace deposits (Pleistocene and Holocene) at surface, covers < 0.1 % of this area

Terrace deposits

Alluvium (Holocene) at surface, covers < 0.1 % of this area

Alluvium

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

Sand sheet deposits

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

Quaternary deposit, undivided