Geologic units in New Mexico (state in United States)

Additional scientific data in this geographic area

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.

Alluvium (Holocene to upper Pleistocene) at surface, covers 7 % of this area

Alluvium

San Andres Formation (Guadalupian and Leonardian) at surface, covers 7 % 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 5 % of this area

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

Upper Santa Fe Group (Middle Pleistocene to uppermost Miocene) at surface, covers 5 % of this area

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

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 3 % 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.

Eolian and piedmont deposits (Holocene to middle Pleistocene) at surface, covers 3 % 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.

Eolian deposits (Holocene to middle Pleistocene) at surface, covers 3 % of this area

Eolian deposits.

San Jose Formation (Eocene) at surface, covers 2 % of this area

San Juan Basin

Upper and lower Cretaceous rocks of east-central and northeast New Mexico (Cenomanian and Albian) at surface, covers 2 % 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.

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

Includes minor vent deposits and small shield volcanoes. Flows are commonly interbedded in the Santa Fe and Gila Groups.

Menefee Formation (Campanian to Santonian) at surface, covers 2 % of this area

Mudstone, shale, and sandstone; coal-bearing.

Gila Group, Formation, or Conglomerate (Middle Pleistocene to uppermost Oligocene?) at surface, covers 2 % of this area

Includes Mimbres Formation and several informal units in southwestern basins.

Yeso Formation (Leonardian) at surface, covers 2 % of this area

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

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

Chinle Group (Upper to middle Triassic) at surface, covers 2 % 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.

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.

Nacimiento Formation (Paleocene) at surface, covers 1 % of this area

San Juan Basin

Upper middle Tertiary basaltic andesites and andesites of the Mogollon Group (Lower Miocene and uppermost Oligocene (22-26 Ma)) at surface, covers 1 % of this area

Includes Bearwallow Mountain Andesite and basaltic andesite of Mangas Mountain; also near vent basaltic lavas and shallow intrusions in the Chuska Mountains.

Upper middle Tertiary rhyolitic pyroclastic rocks of the Mogollon Group, ash-flow tuffs (Upper Oligocene (24-30 Ma)) at surface, covers 1 % of this area

Regional ash-flow tuffs include the La Jencia, Vick's Peak, Lemitar, South Canyon, Bloodgood Canyon, Shelley Peak, Davis Canyon, Park, Rhyolite Canyon, Apache Springs, and Amalia Tuffs; the tuffs of Horseshoe Canyon, Diamond Creek, Garcia Camp, Caronita Canyon, Turkey Springs, and Little Mineral Creek; and the Jordan Canyon Formation. Includes some locally erupted lavas and tuffs within thick intra-caldera units; includes minor volcaniclastic sedimentary units between thin outflow sheets.

Lower middle Tertiary rhyolitic to dacitic pyroclastic rocks of the Datil Group, ash-flow tuffs (Lower Oligocene to upper Eocene (31-36 Ma)) at surface, covers 1 % of this area

Regional ash-flow tuffs include Hell's Mesa, Kneeling Nun, Caballo Blanco, Datil Well, Leyba Well, Rock House Canyon, Blue Canyon, Sugarlump, Oak Creek, Bluff Creek, Gillespie, Box Canyon, Cooney and Chiquito Peak Tuffs; the tuffs of Steins Mountain, Black Bill Canyon, Woodhaul Canyon, and Farr Ranch; tuffs of the Organ cauldron; and lower tuffs in the Bell Top Formation. Includes some locally erupted lavas and tuffs within thick intra-caldera units; includes minor volcaniclastic sedimentary units and lavas between thin outflow sheets.

Lacustrine and playa-lake deposits (Holocene) at surface, covers 1 % of this area

Includes associated alluvial and eolian deposits of major lake basins.

Lower Santa Fe Group (Upper Miocene to uppermost Oligocene) at surface, covers 1 % of this area

Includes Hayner Ranch, Rincon Valley, Popotosa, Cochiti, Tesuque, Chamita, Abiquiu, Zia, and other formations.

Crevasse Canyon Formation (Santonian to Coniacian) at surface, covers 1 % of this area

Coal-bearing units are Dilco and Gibson Coal Members; other members are Bartlett Barren, Dalton Sandstone, and Borrego Pass Sandstone (or Lentil).

Santa Rosa Formation (Carnian) at surface, covers 1 % of this area

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

Mancos Shale (Cenomanian to Campanian) at surface, covers 1.0 % of this area

Divided into Upper and Lower parts by Gallup Sandstone.

Kirtland and Fruitland Formations (Campanian) at surface, covers 0.9 % of this area

Coal-bearing, primarily in the Fruitland.

Basaltic to andesitic lava flows (Middle to lower Pleistocene) at surface, covers 0.9 % of this area

Includes vent deposits.

Pierre Shale and Niobrara Formation (Campanian to Coniacian) at surface, covers 0.9 % of this area

Pierre Shale and Niobrara Formation

Middle Tertiary volcaniclastic sedimentary units (Oligocene to upper Eocene) at surface, covers 0.9 % of this area

Mostly syneruptive volcaniclastic sedimentary aprons. Lower units dominantly derived from volcanic highlands of andesitic to dacitic composition. Locally includes minor lavas and tuffs. Younger units (above and intertongued with Mogollon Group tuffs, Turp) include upper Bell Top Formation, South Crosby Peak Formation, and upper Spears Group units near Quemado. Older units (below and intertongued with Datil Group tuffs, Tlrp) include Palm Park, lower Bell Top, Espinaso and Pueblo Creek Formatios and lower Spears Group formations such as Rincon Windmill, Chavez Canyon, and Dog Springs.

Permian and Pennsylvanian rocks, undivided (Permian and Pennsylvanian) at surface, covers 0.9 % of this area

Includes Concha, Scherrer, Colina, Epitaph, and Earp Formations (Permian) and Horquilla Limestone (Permian to Pennsylvanian).

Landslide deposits and colluvium (Holocene to Pleistocene) at surface, covers 0.8 % of this area

Landslide deposits on western flanks of Socorro Mountains not shown for clarity.

Glorieta Sandstone (Leonardian) at surface, covers 0.8 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

Intertongued Mancos Shale and Dakota Sandstone of west-central New Mexico (Cenomanian) at surface, covers 0.7 % of this area

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

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.

Basaltic to andesitic lava flows (Holocene to middle Pleistocene) at surface, covers 0.7 % of this area

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

Madera Group (Pennsylvanian) at surface, covers 0.6 % of this area

In Manzano Mountains includes Wild Cow Formation and Los Moyos Limestone; in Lucero Mesa includes Red Tanks, Atrasado, Gray Mesa Formations; in Sacramento Mountains includes the non-Madera Holder, Beeman and Gobbler Formations. May include strata lumped as Magdalena Group in a few areas.

Upper middle Tertiary rhyolitic lavas and local tuffs (Upper Oligocene (24-29 Ma)) at surface, covers 0.6 % of this area

Includes Taylor Creek Rhyolite, Fanney Rhyolite, rhyolite of Rocky Canyon, rhyolite of Hardy Ridge, and upper rhyolite members of the Luis Lopez and Sawmill Canyon formations.

Lower-upper middle Tertiary basaltic andesites and andesites of the Mogollon Group (Upper Oligocene (26-29 Ma)) at surface, covers 0.5 % of this area

Includes La Jara Peak Basaltic Andesite, Uvas Basaltic Andesite, basaltic andesites of Poverty Creek and Twin Peaks, Squirrel Springs Canyon Andesite, Razorback Basalt, Bear Springs Basalt, flows of Gila Flat, Salt Creek Formation, Middle Mountain Formation, and the Alum Mountain Group. Pre-Amalia-Tuff lavas in the Questa caldera are dominantly silicic andesites and dacites; elsewhere silicic lavas are a minor component of Tual.

Morrison Formation (Upper Jurassic) at surface, covers 0.5 % of this area

Upper Jurassic nonmarine rocks.

Lower middle Tertiary andesitic to dacitic lavas and pyroclastic flow breccias (Upper to middle Eocene (33-43 Ma)) at surface, covers 0.5 % of this area

Includes Rubio Peak Formation, Orejon Andesite, andesite of Dry Leggett Canyon, andesite of Telephone Canyon, and other units in southwestern, central, and northern New Mexico. Locally includes minor mafic lavas. Ancient landslide blocks of Mader Limestone, as much as one mile long, occur within Rubio Peak lavas in the central Black Range, west of Winston.

Tertiary intrusive rocks of intermediate to silicic composition (Pliocene to Eocene) at surface, covers 0.5 % 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.

Paleoproterozoic granitic plutonic rocks (Paleoproterozoic) at surface, covers 0.5 % of this area

Variably foliated granites and granitic gneisses; 1.71 - 1.65 Ga in northern New Mexico; 1.66 - 1.65 Ga in central and southern New Mexico.

Morrison Formation and upper San Rafael Group (lowermost Cretaceous? - upper Jurassic) at surface, covers 0.5 % of this area

Morrison Formation and upper San Rafael Group

Dakota Sandstone (Cenomanian) at surface, covers 0.5 % of this area

Includes Oak Canyon, Cubero, and Paguate Tongues; includes Clay Mesa Tongue of Mancos Shale.

Paleogene sedimentary units (Paleogene) at surface, covers 0.5 % of this area

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

Lewis Shale (Campanian) at surface, covers 0.4 % of this area

Marine shale and mudstone.

Bull Canyon Formation (Norian) at surface, covers 0.4 % of this area

Bull Canyon Formation

Mancos Shale, lower part (Turonian and Cenomanian) at surface, covers 0.4 % of this area

Mancos Shale, lower part

Abo Formation (Wolfcampian) at surface, covers 0.4 % 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.

San Rafael Group (Middle Jurassic) at surface, covers 0.4 % of this area

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

Mesoproterozoic granitic plutonic rocks (Mesoproterozoic) at surface, covers 0.4 % of this area

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

Raton Formation (Paleocene and upper Cretaceous) at surface, covers 0.4 % of this area

Distal sandstones, mudstones, and coal beds in eastern Raton Basin. Middle barren zone laterally equivalent to Poison Canyon Formation. K/T boundary discontinuously exposed about 100 m above basal conglomerate in area southwest of Raton.

Mancos Shale, upper part (Campanian to Coniacian) at surface, covers 0.4 % of this area

Mancos Shale, upper part

Older piedmont alluvial deposits and shallow basin fill (Middle Pleistocene to uppermost Pliocene) at surface, covers 0.4 % of this area

Includes Quemado Formation and in northeast, high-level pediment gravels.

Mesaverde Group (Campanian to Turonian) at surface, covers 0.4 % of this area

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

Los Pinos Formation of Lower Santa Fe Group (Miocene and upper Oligocene) at surface, covers 0.3 % of this area

Includes Carson Conglomerate (Dane and Bachman, 1965) in Tusas Mountains-San Luis Basin area.

Silicic to intermediate volcanic rocks (Neogene, mostly Miocene) at surface, covers 0.3 % of this area

Rhyolite and dacite flows with associated minor tuffs. Commonly interbedded with Santa Fe or Gila Group sedimentary units. Dacitic lavas in northern Jemez Mountains are Pliocene.

Upper and Middle Jurassic rocks, undivided (Upper and Middle Jurassic) at surface, covers 0.3 % of this area

In southwest includes the basalt-bearing Broken Jug Formation.

Bandelier Tuff (Lower Pleistocene) at surface, covers 0.3 % of this area

Includes large blocks of older andesite in caldera-collapse breccia facies locally exposed on resurgent dome of the Valles caldera.

Intermediate to silicic volcanic rocks (Neogene) at surface, covers 0.3 % of this area

Mostly andesitic to dacitic strato volcanoes. Includes rhyolite lavas and tuffs in the Jemez Mountains, Volcanoes in Jemez Mountains and eastern Colfax County are upper Miocene. Mount Taylor and composite volcanoes in the Taos Plateau volcanic field are Pliocene.

Poison Canyon Formation (Paleocene and upper Cretaceous) at surface, covers 0.3 % of this area

Proximal conglomerates and sandstones in western Raton Basin; generally lacking coal beds. Cretaceous beds mostly restricted to subsurface.

Lower middle Tertiary volcanic rocks (Lower Oligocene to upper Eocene (older than 31 Ma)) at surface, covers 0.3 % of this area

Mostly intermediate lavas of the lower Datil Group and intermediate volcaniclastic sediments of the lower Spears Group (Tla+Tvs). Locally includes ash-flow tuffs of the upper Datil Group (Tlrp). Includes intermediate volcaniclastic sedimentary rocks of the Conejos Formation in northern New Mexico.

Queen and Grayburg Formations (Guadalupian) at surface, covers 0.3 % of this area

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

Cliff House Sandstone (Campanian) at surface, covers 0.3 % of this area

Transgressive marine sandstone.

Point Lookout Sandstone (Campanian to Santonian) at surface, covers 0.3 % of this area

Regressive marine sandstone in McKinley and Sandoval Counties; the lower, Hosta Tongue, of Point Lookout is transgressive and is separated from main body by the Satan Tongue of Mancos Shale.

Moreno Hill Formation and Atarque Sandstone (Turonian) at surface, covers 0.3 % of this area

In Salt Lake coal field and extreme southern Zuni basin.

Gypsiferous eolian deposits (Holocene to middle Pleistocene) at surface, covers 0.3 % of this area

Gypsiferous eolian deposits.

Basaltic to andesitic lava flows (Miocene) at surface, covers 0.3 % of this area

Includes minor vent deposits. Flows are commonly interbedded in the Santa Fe and Gila Groups.

Entrada Sandstone (Middle Jurassic) at surface, covers 0.2 % of this area

Entrada Sandstone

Fence Lake Formation (Miocene) at surface, covers 0.2 % of this area

Conglomerate and conglomeratic sandstone, coarse fluvial volcaniclastic sediments, minor eolian facies, and pedogenic carbonates of the southern Colorado Plateau region.

Upper Tertiary sedimentary units (Pliocene to upper Oligocene) at surface, covers 0.2 % of this area

Includes Bidahochi Formation (Pliocene to upper Miocene), Picuris Formation (Miocene to Oligocene), Las Feveras Formation (Pliocene), lower Gila Group units in the southwest, and unnamed Pliocene unit in northwestern Socorro County.

Paleoproterozoic metasedimentary rocks (Paleoproterozoic) at surface, covers 0.2 % of this area

Pelitic schist, quartz-muscovite schist, immature quartzite, and subordinate amphibolite; includes parts of Vadito Group in northern New Mexico, immature metasedimentary rocks of central New Mexico, and Bullard Peak Series mixed supracrustal rocks in Burro Mountains.

San Andres Limestone and Glorieta Sandstone (Guadalupian and Leonardian) at surface, covers 0.2 % of this area

San Andres Limestone and Glorieta Sandstone

Santa Fe Group, undivided (Middle Pleistocene to uppermost Oligocene) at surface, covers 0.2 % 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.

Greenhorn Formation (Turonian to Cenomanian) at surface, covers 0.2 % of this area

Limited to northeastern area; the upper member (Bridge Creek Limestone) can be traced into western area where it is commonly shown as a bed-rank unit in Mancos Shale on detailed maps.

Graneros Shale (Cenomanian) at surface, covers 0.2 % of this area

Limited to northeastern area.

Gallup Sandstone (Turonian) at surface, covers 0.2 % of this area

Generally regressive marine sandstone.

Rio Salado Tongue of the Mancos Shale (Turonian) at surface, covers 0.2 % of this area

Overlies Twowells Tongue of Dakota Sandstone; mapped only where Tres Hermanos Formation or the Atarque Sandstone is present; mapped as Kdr in parts of Socorro County.

Middle Tertiary volcanic rocks, undifferentiated (Lower Miocene to upper Eocene) at surface, covers 0.2 % of this area

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

Hueco Formation or Group (Wolfcampian) at surface, covers 0.2 % of this area

Limestone unit restricted to south-central area; Pendejo Tongue of Hueco Formation divides Abo Formation into upper and lower parts in Sacramento Mountains.

Carlile Shale (Turonian) at surface, covers 0.2 % of this area

Limited to northeastern area.

Basaltic to andesitic lava flows (Neogene) at surface, covers 0.2 % of this area

Includes minor vent deposits. Flows are commonly interbedded in the Santa Fe and Gila Groups.

Tres Hermanos Formation (Turonian) at surface, covers 0.2 % of this area

Formerly designated as Lower Gallup Sandstone in the Zuni Basin.

Paleoproterozoic quartzite (Paleoproterozoic) at surface, covers 0.2 % of this area

Includes 1.70 Ga Ortega Quartzite and equivalents in northern New Mexico and 1.67 Ga quartzites in central New Mexico.

Chuska Sandstone (Middle to upper Oligocene) at surface, covers 0.2 % of this area

Restricted to Chuska Mountains.

Rustler Formation (Upper Permian) at surface, covers 0.2 % of this area

Siltstone, gypsum, sandstone, and dolomite.

Yates and Tansill Formations (Guadalupian) at surface, covers 0.2 % of this area

Sandstone, siltstone, limestone, dolomite, and anhydrite.

Lower middle Tertiary rhyolitic lavas and local tuffs (Lower Oligocene to upper Eocene (31-36 Ma)) at surface, covers 0.2 % of this area

Includes Mimbres Peak Formation, rhyolite of Cedar Hills, and other units in the Bootheal region.

Upper middle Tertiary volcanic rocks (Lower Miocene to upper Oligocene (younger than 30 Ma)) at surface, covers 0.2 % of this area

Mostly a combination of basaltic andesite lavas and rhyolitic ash-flow tuffs of the Mogollon Group (Tuau+Tual+Turp). Includes locally erupted lavas and tuffs in some calderas.

Mulatto Tongue of Mancos Shale (Santonian to Coniacian) at surface, covers 0.2 % of this area

Mulatto Tongue of Mancos Shale

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided (Mesoproterozoic and Paleoproterozoic) at surface, covers 0.2 % of this area

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided

Ojo Alamo Formation (Paleocene) at surface, covers 0.2 % of this area

San Juan Basin

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

Gypsum, anhydrite, salt, dolomite, and siltstone.

Garita Creek Formation (Carnian) at surface, covers 0.1 % of this area

Garita Creek Formation

Animas Formation (Paleocene and upper Cretaceous) at surface, covers 0.1 % of this area

Volcaniclastic sedimentary rocks of intermediate composition in northern San Juan Basin.

Pictured Cliffs Sandstone (Campanian) at surface, covers 0.1 % of this area

Prominent cliff-forming marine sandstone.

Paleoproterozoic mafic metavolcanic rocks with subordinate felsic metavolcanic rocks (Paleoproterozoic) at surface, covers 0.1 % of this area

Includes the 1.78-1.72 Ga Moppin (Tusas Mountains), Gold Hill (Taos Range), and Pecos (Sangre de Cristo Mountains) complexes; interpreted to be supracrustal part of juvenile volcanic arc basement.

Poison Canyon and Raton Formations (Paleocene and upper Cretaceous) at surface, covers 0.1 % of this area

Broadly intertonguing conglomeratic sandstones, sandstones and mudstones; minor coal beds.

Pescado Tongue of the Mancos Shale and Gallup Sandstone (Turonian) at surface, covers 0.1 % of this area

In Zuni Basin only; Pescado is chrono-stratigraphic equivalent of Juana Lopez Member of Mancos Shale.

Greenhorn Formation and Graneros Shale (Turonian and Cenomanian) at surface, covers 0.1 % of this area

Limited to northeastern area.

Satan Tongue of Mancos Shale (Santonian) at surface, covers 0.1 % of this area

Satan Tongue of Mancos Shale

Paleoproterozoic calc-alkaline plutonic rocks (Paleoproterozoic) at surface, covers 0.1 % of this area

Granodiorite, diorite, and gabbro complexes; 1.78-1.71 Ga; interpreted to be intrusive part of juvenile volcanic arc basement.

Basaltic to andesitic lava flows (Upper Pleistocene to lower Pliocene) at surface, covers 0.1 % of this area

Includes minor vent deposits.

Zuni and Entrada Sandstones, undivided (Middle Jurassic) at surface, covers < 0.1 % of this area

Zuni and Entrada Sandstones, undivided

Salado Formation (Upper Permian) at surface, covers < 0.1 % of this area

Evaporite sequence, dominantly halite.

Permian rocks, undivided (Permian) at surface, covers < 0.1 % of this area

Permian rocks, undivided

Castile Formation (Upper Permian) at surface, covers < 0.1 % of this area

Dominantly anhydrite sequence.

Cutler Formation (Wolfcampian to Upper Pennsylvanian) at surface, covers < 0.1 % of this area

Used in northern areas and Chama embayment only.

Paleoproterozoic rhyolite and felsic volcanic schist (Paleoproterozoic) at surface, covers < 0.1 % of this area

Includes 1.70 Ga Vadito Group in northern New Mexico and 1.68 Ga Sevilleta Metarhyolite in central New Mexico.

Gallup Sandstone and underlying D-Cross Tongue of the Mancos Shale (Turonian) at surface, covers < 0.1 % of this area

Gallup Sandstone and underlying D-Cross Tongue of the Mancos Shale

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

Trujillo Formation

Tertiary-Cretaceous andesitic to dacitic lavas and pyroclastic breccias (Paleocene and upper Cretaceous) at surface, covers < 0.1 % of this area

Includes many remnants of eruptive centers in Grant and Hidalgo Counties and Upper Creatceous andesitic lavas in Sierra County.

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

Silurian through Cambrian rocks, undivided

Fort Hays Limestone Member of Niobrara Formation (Coniacian to Turonian) at surface, covers < 0.1 % of this area

Fort Hays Limestone Member of Niobrara Formation

Mancos Shale and Beartooth and Sarten Formations (Cenomanian and Albian) at surface, covers < 0.1 % of this area

Mancos includes what was formerly referred to as Colorado Shale, which in turn may include equivalents of Tres Hermanos Formation.

Lower Cretaceous, undivided (Lower Cretaceous) at surface, covers < 0.1 % of this area

In northern Lea and Roosevelt Counties includes equivalents of Tucumcari Shale; in Cornudas Mountains includes Campogrande and Cox Formations and Washita Group; at Cerro de Cristo Rey includes several formations of the Fredricksburg and Washita Groups, and the Boquillas Formation (Cenomanian); in the southwest includes Mojado, U-Bar (Aptian), and Hell-to-Finish Formations, whch are equivalent to Bisbee Group of Arizona.

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

Shale, arkose, and limestone.

Hinsdale Basalt (Miocene and upper Oligocene) at surface, covers < 0.1 % of this area

Northern Taos and eastern Rio Arriba Counties; basalt flows interbedded with Los Pinos Formation.

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

Arroyo Penasco Group in Sangre de Cristo Mountains, Sierra Nacimiento, San Pedro Mountain, and Sandia Mountains; Lake Valley Limestone in south-central New Mexico.

Triassic rocks, undivided (Triassic) at surface, covers < 0.1 % of this area

Continental red beds.

Ring-fracture rhyolite lava domes of the Valles caldera (Uppermost to lower Pleistocene) at surface, covers < 0.1 % of this area

Upper members of the Valles Rhyolite in Jemez Mountains. Includes 60-ka Banco Bonito and El Cajete Members on south margin of caldera.

Tertiary-Cretaceous intrusive rocks (Paleocene and upper Cretaceous) at surface, covers < 0.1 % of this area

Includes granodiorite to quartz monzonite stocks and plutons at Hanover, Fierro, Tyrone, Lordsburg, and the 73 Ma quartz monzonite porphyry stock at Copper Flatsin Sierra County. Also includes many norhteast-trending monzonite porphyry dikes in the Silver City region.

Mississippian and Devonian rocks, undivided (Mississippian and Devonian) at surface, covers < 0.1 % of this area

Includes Helms, Rancheria, Las Cruces, Lake Valley, and Caballero Formations and Escabrosa Group (Mississippian); Percha Shale, Contadero, Sly Gap, and Onate Formations of south-central New Mexico, and Canutillo Formation of northern Franklin Mountains and Bishops Cap area (Devonian).

Upper Cretaceous rocks of southwestern New Mexico, undivided (Maastrichtian to Cenomanian) at surface, covers < 0.1 % of this area

Beartooth and Sarten Formations are in part Albian. Includes Virden Formation in northern Hidalgo County, Ringbone Formation in Hidalgo, Luna and Grant Counties, Mancos Shale in Silver City area.

Sangre de Cristo Formation (Wolfcampian to Desmoinesian) at surface, covers < 0.1 % of this area

In Sangre de Cristo Mountains.

Paleoproterozoic pelitic schist (Paleoproterozoic) at surface, covers < 0.1 % of this area

Includes Rinconada Formation in northern New Mexico and Blue Springs Schist in Manzano Mountains.

Vermejo Formation and Trinidad Sandstone (Maastrichtian to Campanian) at surface, covers < 0.1 % of this area

Vermejo Formation and Trinidad Sandstone

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).

Basaltic tephra and lavas near vents (Upper to middle Pleistocene) at surface, covers < 0.1 % of this area

Tuff rings, maars, cinder cones, and minor proximal lavas. Includes maars at Killbourne Hole and Zuni Salt Lake.

Hosta Tongue of Point Lookout Sandstone (Santonian) at surface, covers < 0.1 % of this area

Transgressive marine sandstone.

Older rhyolite lavas and early volcaniclastic sedimentary fill deposits of the Valles caldera (Lower Pleistocene) at surface, covers < 0.1 % of this area

Units are associated with resurgent doming or predate doming of the caldera core. Includes minor middle Pleistocene tuffs of the upper Valles Rhyolite on north side of caldera.

Sandia Formation (Atokan) at surface, covers < 0.1 % of this area

Predominately clastic unit (commonly arkosic) with minor black shales, and limestone in lower part; map unit locally includes Morrowan Osha Canyon Formation in Sierra Nacimiento.

Panther Seep Formation (Virgilian) at surface, covers < 0.1 % of this area

In Organ, Franklin, and San Andres Mountains.

Travertine (Holocene to Pliocene) at surface, covers < 0.1 % of this area

Includes some pedogenic carbonate south of Sierra Ladrones.

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

Paleozoic rocks, undivided (Paleozoic) at surface, covers < 0.1 % of this area

Paleozoic rocks, undivided

Rock Point Formation of Chinle Group (Upper Triassic) at surface, covers < 0.1 % of this area

May locally include Wingate Sandstone.

Redonda Formation (Upper Triassic) at surface, covers < 0.1 % of this area

Redonda Formation

Quartermaster and Rustler Formations (Upper Permian) at surface, covers < 0.1 % of this area

Quartermaster and Rustler Formations

Dakota Sandstone and Rio Salado Tongue of the Mancos Shale (Cenomanian) at surface, covers < 0.1 % of this area

In northwest Socorro County locally includes overlying Tres Hermanos Formation.

Lead Camp Formation (Atokan to Missourian) at surface, covers < 0.1 % of this area

In San Andres and Organ Mountains.

Tertiary mafic intrusive rocks (Pliocene to upper Eocene) at surface, covers < 0.1 % of this area

Includes many long basaltic andesite dikes of Oligocene age near Pie Town, Acoma, Riley, Chupadera, Truth or Consequences, Roswell, Raton, and Dulce; and several elongate or shoestring-like sills of basalt or basaltic andesite. Also includes basaltic necks of Pliocene age that dot the landscape northeast of Mount Taylor. Where dikes extend into Quaternary alluvium the contact is an unconformity.

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

Limestone (reef facies).

McRae Formation (Maastrichtian) at surface, covers < 0.1 % of this area

Engle basin - Cutter sag area.

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

Playa

Cretaceous rocks, undivided (Cretaceous) at surface, covers < 0.1 % of this area

Cretaceous rocks, undivided

Ordovician and Cambrian plutonic rocks of Florida Mountains (Ordovician and Cambrian) at surface, covers < 0.1 % of this area

Ordovician and Cambrian plutonic rocks of Florida Mountains

Glacial deposits (Upper to middle Pleistocene) at surface, covers < 0.1 % of this area

Glacial deposits; till and outwash.

Silurian and Ordovician rocks, undivided (Silurian and Ordovician) at surface, covers < 0.1 % of this area

Silurian and Ordovician rocks, undivided

Quartermaster Formation; red sandstone and siltstone; Upper Permian (Upper Permian) at surface, covers < 0.1 % of this area

Red sandstone and siltstone.

Greenhorn Formation and Carlile Shale, undivided (Turonian to Cenomanian) at surface, covers < 0.1 % of this area

Locally includes Graneros Shale.

Lower part of Abo Formation (locally Virgilian to Upper Pennsylvanian) at surface, covers < 0.1 % of this area

Lower part of Abo Formation

Zuni Sandstone (Callovian) at surface, covers < 0.1 % of this area

Consists of undivided equivalents of the Summerville Formation and Bluff Sandstone; restricted to Zuni Basin area.

Ordovician and Cambrian rocks, undivided (Ordovician and Cambrian) at surface, covers < 0.1 % of this area

Includes Montoya Formation (or Group), El Paso Formation, and Bliss Sandstone.

Cherry Canyon Formation (Guadalupian) at surface, covers < 0.1 % of this area

Basin facies - sandstone, limestone, and shale.

Upper part of Abo Formation (Wolfcampian) at surface, covers < 0.1 % of this area

Upper part of Abo Formation

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

Blackwater Draw Formation

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

Moenkopi Formation

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

Sand sheet deposits

Cutoff Shale (Leonardian) at surface, covers < 0.1 % of this area

In Brokeoff Mountains only.

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

Ogallala Formation

Victorio Peak Limestone (Leonardian) at surface, covers < 0.1 % of this area

In Brokeoff Mountains only.

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

Sand deposits, undivided

Yeso and Abo Formations, undivided (Lower Permian) at surface, covers < 0.1 % of this area

Yeso and Abo Formations, undivided

Basalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite (Tertiary) at surface, covers < 0.1 % of this area

Includes basalts of Hinsdale Fm in San Juan Mountains - Servilleta Fm in San Luis Valley and many other occurrences

Devonian rocks undivided (Devonian) at surface, covers < 0.1 % of this area

Includes Percha Shale, Onate and Sly Gap Formations.

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

CIMARRON- Generally semiconsolidated clay, silt, sand, gravel, and caliche 0 to 400 feet thick. BEAVER- Interbedded sand, siltstone, clay, gravel lenses, and thin limestone. Caliche common near surface but occurrence is not limited to the surface. Caliche accounts for most of the white color in the Ogallala. Other colors generally light tan or buff but locally may be pastel shades of almost any color. The Laverne and Rexroad Formations of Pliocene age and the Meade Group and Odee (of local usage) and other formations of Pleistocene age occur locally and are included with the Ogallala Formation, 0-700 feet thick. WOODWARD- Gravel, sand, silt, clay, caliche, and limestone, locally cemented with calcium carbonate. Generally light-tan to gray to white. Thickness ranges up to 400 feet and probably averages 150 feet. CLINTON- Gray to light-brown, fine- to medium-grained sand with some, clay, silt, gravel, volcanic ash, and caliche beds; locally cemented by calcium carbonate. Thickness ranges from 0 to about 320 feet. The formation thins eastward.

Bell Canyon Formation (Guadalupian) at surface, covers < 0.1 % of this area

Basin facies - sandstone, limestone, and shale.

La Ventana Tongue of the Cliff House Sandstone (Turonian) at surface, covers < 0.1 % of this area

La Ventana Tongue of the Cliff House Sandstone

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

Alluvium

Dakota Sandstone (Early Cretaceous) at surface, covers < 0.1 % of this area

CIMARRON- Buff to light-brown, fine- to medium-grained, thin bedded to massive sandstone with interbedded shales.

Gravels and alluviums (Quaternary) at surface, covers < 0.1 % of this area

Includes Broadway and Louviers Alluviums

Niobrara Fm (Cretaceous) at surface, covers < 0.1 % of this area

Calcareous shale and limestone

Santa Fe Fm (Tertiary) at surface, covers < 0.1 % of this area

Siltstone, sandstone, and conglomerate

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

Dune sand sheet deposits

Pre-ash-flow andesitic lavas, breccias, tuffs, and conglomerates (Tertiary) at surface, covers < 0.1 % of this area

Includes several named units

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

CIMARRON- Upper shale unit: Varicolored siltstone or claystone, conglomerate, fine-grained sandstone, and limestone. Lower sandstone unit: Varicolored, fine- to coarse-grained sandstone with some clay and interbedded shale.

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

Exposed in Sacramento Mountains, present in subsurface in southeastern New Mexico as De Baca Group.

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

Tecovas Formation

Los Pinos Fm (Tertiary) at surface, covers < 0.1 % of this area

Volcaniclastic conglomerate interbedded with basalt flows of Hinsdale Fm (Tbb) on east flank of San Juan Mountains. Grades laterally into Santa Fe Fm of San Luis Valley

Raton Fm (Tertiary-Cretaceous) at surface, covers < 0.1 % of this area

Arkosic sandstone, siltstone, and shale; contains major coal deposits in Raton Basin

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

Chinle Formation

Quaternary-Tertiary bolson deposits (Pliocene to Pleistocene) at surface, covers < 0.1 % of this area

Quaternary-Tertiary bolson deposits

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

Caliche deposits

Hueco Limestone (Permian; Wolfcamp Series) at surface, covers < 0.1 % of this area

Hueco Limestone

Mancos Shale (Cretaceous) at surface, covers < 0.1 % of this area

In northwest and west-central: Intertongues complexly with units of overlying Mesaverde Group or Fm; lower part consists of a calcareous Niobrara equivalent and Frontier Sandstone and Mowry Shale Members; in areas where the Frontier and Mowry Members (Kmfm), or these and the Dakota Sandstone (Kfd) are distinguished, map unit (Km) consists of shale above Frontier Member. In Southwest: Lower part contains Juana Lopez Member (Kmj)

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

Unconsolidated to strongly consolidated alluvial and eolian deposits. This unit includes: coarse, poorly sorted alluvial fan and terrace deposits on middle and upper piedmonts and along large drainages; sand, silt and clay on alluvial plains and playas; and wind-blown sand deposits. (0-2 Ma)

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

Trujillo Formation

Granitic rocks of 1400-m.y. age group (Middle Proterozoic) at surface, covers < 0.1 % of this area

Includes Silver Plume, Sherman, Cripple Creek, St. Kevin, Vernal Mesa, Curecanti, Eolus, and Trimble Granites or Quartz Monzonites; also, San Isabel Granite of Boyer (1962) and unnamed granitic rocks

Carlile Shale, Greenhorn Limestone, and Graneros Shale (Cretaceous) at surface, covers < 0.1 % of this area

Carlile Shale, Greenhorn Limestone, and Graneros Shale

Middle Miocene to Oligocene volcanic rocks (Oligocene to Middle Miocene) at surface, covers < 0.1 % of this area

Lava, tuff, fine-grained intrusive rock, and diverse pyroclastic rocks. These compositionally variable volcanic rocks include basalt, andesite, dacite, and rhyolite. Thick felsic volcanic sequences form prominent cliffs and range fronts in the Black (Mohave County), Superstition, Kofa, Eagletail, Galiuro, and Chiricahua Mountains. This unit includes regionally extensive ash-flow tuffs, such as the Peach Springs tuff of northwestern Arizona and the Apache Leap tuff east of Phoenix. Most volcanic rocks are 20-30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona, but this unit includes some late Eocene rocks near the New Mexico border in east-central Arizona. (11-38 Ma)

Poison Canyon Fm (Tertiary) at surface, covers < 0.1 % of this area

Arkosic conglomerate, sandstone, and shale

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

Alluvial fan deposits

Pictured Cliffs Sandstone and Lewis Shale (Cretaceous) at surface, covers < 0.1 % of this area

Pictured Cliffs Sandstone and Lewis Shale

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

Includes Piney Creek Alluvium and younger deposits

Pierre Shale, undivided (Cretaceous) at surface, covers < 0.1 % of this area

Pierre Shale, undivided

Purgatoire Formation (Early Cretaceous) at surface, covers < 0.1 % of this area

CIMARRON- Kiowa Shale Member: Gray to black fossiliferous shale with sandstone in the upper part. Thickness ranges from 0 to 50 +/- feet. Cheyenne Sandstone Member: Massive, white to buff, fine- to medium-grained sandstone, containing some conglomerate in the lower part, from 0 to 120 +/- feet thick.

Cretaceous rocks, undivided (Late Cretaceous) at surface, covers < 0.1 % of this area

Cretaceous rocks, undivided

Ash-flow tuff of main volcanic sequence (Tertiary) at surface, covers < 0.1 % of this area

Includes many named units

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

Terrace deposits

Quartzite, conglomerate, and interlayered mica schist (Early Proterozoic) at surface, covers < 0.1 % of this area

Quartzite, conglomerate, and interlayered mica schist

Pierre Shale (Kp), Niobrara (Kn), and Carlile, Greenhorn, and Graneros (Kcg) Fms, undivided (Cretaceous) at surface, covers < 0.1 % of this area

Pierre Shale (Kp), Niobrara (Kn), and Carlile, Greenhorn, and Graneros (Kcg) Fms, undivided

South Park Fm (Tertiary) at surface, covers < 0.1 % of this area

Arkosic sandstone and shale, volcaniclastic conglomerate, and andesite flows and breccia

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

CIMARRON- Clay, silt, sand, and gravel 0 to 100 feet thick. TEXAS- Sand, silt, clay, and gravel located in valleys of principal streams. Thickness not known but may exceed 100 feet in North Canadian River valley and may be 50 to 100 feet in lower parts of valleys of Coldwater and Palo Duro Creeks BEAVER - Sand, gravel, silt, and clay in discontinuous lenses along courses of larger streams. 0-50 feet thick.

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

Leona Formation

Mesaverde Fm, undivided (Cretaceous) at surface, covers < 0.1 % of this area

In northwest and west-central: Major coal beds in lower part; Rollins Sandstone Member at base in Delta, Gunnison, and Pitkin Counties. In southwest: sandstone and shale.

Morrison Formation (Late Jurassic) at surface, covers < 0.1 % of this area

CIMARRON- Varicolored fine-grained sandstone, limestone, dolomite, shale, and conglomerate 0 to 470 +/- feet thick.

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

Bolson deposits

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

Sand dune deposits

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

CIMARRON- Massive, white to buff, fine- to medium-grained sandstone 0 to 50 +/- feet thick.

Mingus Formation (Pennsylvanian; Des Moines Series) at surface, covers < 0.1 % of this area

Mingus Formation

Late and middle Pleistocene surficial deposits (Middle to Late Pleistocene) at surface, covers < 0.1 % of this area

Unconsolidated to weakly consolidated alluvial fan, terrace, and basin-floor deposits with moderate to strong soil development. Fan and terrace deposits are primarily poorly sorted, moderately bedded gravel and sand, and basin-floor deposits are primarily sand, silt, and clay. (10-750 ka)

Vermejo Fm and Trinidad Sandstone (Cretaceous) at surface, covers < 0.1 % of this area

Shale, sandstone, and major coal beds; sandstone

Dakota, Purgatoire, Morrison, Ralston Creek, and Entrada Fms in southeast. Dakota, Morrison, and Entrada Fms in central mountains. Dakota, Burro Canyon, Morrison, Wanakah, and Entrada Fms in Gunnison River area. Dakota, Morrison, Curtis, And Entrada Fm (Cretaceous-Jurassic) at surface, covers < 0.1 % of this area

Dakota, Purgatoire, Morrison, Ralston Creek, and Entrada Fms in southeast. Dakota, Morrison, and Entrada Fms in central mountains. Dakota, Burro Canyon, Morrison, Wanakah, and Entrada Fms in Gunnison River area. Dakota, Morrison, Curtis, And Entrada Fm

Biotitic gneiss, schist, and migmatite (Early Proterozoic) at surface, covers < 0.1 % of this area

Locally contains minor hornblende gneiss, calc-silicate rock, quartzite, and marble. Derived principally from sedimentary rocks

Sangre de Cristo Fm (Permian-Pennsylvanian) at surface, covers < 0.1 % of this area

Arkosic conglomerate, sandstone, and siltstone

Ogallala Fm (Tertiary) at surface, covers < 0.1 % of this area

Loose to well-cemented sand and gravel

Pliocene to middle Miocene deposits (Middle Miocene to Pliocene) at surface, covers < 0.1 % of this area

Moderately to strongly consolidated conglomerate and sandstone deposited in basins during and after late Tertiary faulting. Includes lesser amounts of mudstone, siltstone, limestone, and gypsum. These deposits are generally light gray or tan. They commonly form high rounded hills and ridges in modern basins, and locally form prominent bluffs. Deposits of this unit are widely exposed in the dissected basins of southeastern and central Arizona. (2-16 Ma)

Basalt (Pliocene) at surface, covers < 0.1 % of this area

CIMARRON- Dark, dense to vesicular volcanic rock 50 to 85 +/- feet thick forming cap rock of Black Mesa.

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

Quaternary deposit, undivided

Cretaceous sedimentary rocks (Cretaceous) at surface, covers < 0.1 % of this area

Tan sandstone (Dakota Sandstone) overlain by gray shale (Mancos Shale); deposited in beach, river delta, and shallow sea settings. The Mancos Shale is overlain by the Mesaverde Group (map unit Kmv). This unit includes related sandstone and shale exposed near Show Low, Morenci (Pinkard Formation), and around Deer Creek south of Globe. (about 88-97 Ma)