Geologic units in Lincoln county, New Mexico

Additional scientific data in this geographic area

San Andres Formation (Guadalupian and Leonardian) at surface, covers 54 % of this area

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

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 11 % 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.

Tertiary intrusive rocks of intermediate to silicic composition (Pliocene to Eocene) at surface, covers 4 % of this area

Includes monzonitic to granitic plutons, stocks, laccoliths, and porphyritic dikes in deeply eroded magmatic centers; and andesitic, dacitic, or rhyolitic plugs and dikes near cauldrons or stratovolcanoes. In the Latir field, fine-grained rhyolitic dikes commonly cut coarse-grained granitic plutons. Includes alkaline laccoliths, plugs, and dikes in Colfax County. North-trending dikes near Capitan include some mafic diabase dikes.

Glorieta Sandstone (Leonardian) at surface, covers 4 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

Yeso Formation (Leonardian) at surface, covers 4 % of this area

Sandstones, siltstones, anhydrite, gypsum, halite, and dolomite.

Alluvium (Holocene to upper Pleistocene) at surface, covers 4 % of this area

Alluvium

Chinle Group (Upper to middle Triassic) at surface, covers 3 % of this area

Map unit includes Moenkopi Formation (Middle Triassic) at base in many areas; in eastern part of state the following five formations are mapped: TRr, TRb, TRt, TRg, and TRs.

Middle Tertiary volcanic rocks, undifferentiated (Lower Miocene to upper Eocene) at surface, covers 3 % of this area

Includes the predominantly andesitic to dacitic stratovolcano complex at Sierra Blanca (Oligocene to upper Eocene) and many smaller outliers.

Mesaverde Group (Campanian to Turonian) at surface, covers 2 % of this area

Includes Cliff House Sandstone, Menefee Formation, and Point Lookout Sandstone.

Mancos Shale (Cenomanian to Campanian) at surface, covers 2 % of this area

Divided into Upper and Lower parts by Gallup Sandstone.

Basaltic to andesitic lava flows (Holocene to middle Pleistocene) at surface, covers 2 % of this area

Flows south of Grants and west of Carrizozo are Holocene. Includes minor vent deposits.

Artesia Group (Guadalupian) at surface, covers 2 % 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.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 1 % of this area

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

San Andres Limestone and Glorieta Sandstone (Guadalupian and Leonardian) at surface, covers 1 % of this area

San Andres Limestone and Glorieta Sandstone

Upper and lower Cretaceous rocks of east-central and northeast New Mexico (Cenomanian and Albian) at surface, covers 0.9 % 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.

Eolian deposits (Holocene to middle Pleistocene) at surface, covers 0.8 % of this area

Eolian deposits.

Pennsylvanian rocks, undivided (Pennsylvanian) at surface, covers 0.7 % of this area

In Sangre de Cristo Mountains may include Sandia, Madera, La Pasada, Alamitos, and Flechado Formations; elsewhere may include Bar-B, Nakaye, Red House, Oswaldo, and Syrena Formations.

Paleogene sedimentary units (Paleogene) at surface, covers 0.6 % of this area

Includes Baca, Galisteo, El Rito, Blanco Basin, Hart Mine, Love Ranch, Lobo, Sanders Canyon, Skunk Ranch, Timberlake, and Cub Mountain Formations.

Upper Santa Fe Group (Middle Pleistocene to uppermost Miocene) at surface, covers 0.4 % of this area

Includes Camp Rice, Fort Hancock, Palomas, Sierra Ladrones, Arroyo Ojito, Ancha, Puye, and Alamosa Formations.

Santa Fe Group, undivided (Middle Pleistocene to uppermost Oligocene) at surface, covers 0.3 % of this area

Basin fill of the Rio Grande rift. Locally represents upper Miocene formations of the middle Santa Fe Group in the northern Albuquerque Basin.

Abo Formation (Wolfcampian) at surface, covers 0.2 % of this area

Red beds, arkosic at base, finer and more mature above; Wolfcampian; may include limestone beds of Pennsylvanian age (Virgilian) in Zuni Mountains. In Robledo Mountains the Abo may be considered a member of the Hueco Formation.

Bursum Formation (Lowermost Permian to uppermost Pennsylvanian) at surface, covers 0.1 % of this area

Shale, arkose, and limestone.

Moenkopi Formation (Middle Triassic) at surface, covers < 0.1 % of this area

Moenkopi Formation

Mesoproterozoic granitic plutonic rocks (Mesoproterozoic) at surface, covers < 0.1 % of this area

Mainly 1.45 - 1.35 Ga megacrystic granites, generally weakly foliated except locally at their margins.

Intertongued Mancos Shale and Dakota Sandstone of west-central New Mexico (Cenomanian) at surface, covers < 0.1 % of this area

Includes the Whitewater Arroyo Tongue of Mancos Shale and the Twowells Tongue of the Dakota.

Mississippian through Cambrian rocks, undivided (Mississippian through Cambrian) at surface, covers < 0.1 % of this area

Includes Lake Valley Limestone (Mississippian); Devonian rocks, undivided; El Paso Formation and Montoya Group or Formation (Ordovician); and Bliss Sandstone (Cambrian and Ordovician).

San Andres, Glorieta, and Yeso Formations, undivided (Guadalupian and Leonardian) at surface, covers < 0.1 % of this area

San Andres, Glorieta, and Yeso Formations, undivided

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 < 0.1 % 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.