Skip to main content

Geologic units in New Mexico (state in United States)

Additional scientific data in this geographic area

piedmont alluvial deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 10 % of this area

Piedmont alluvial deposits: upper and middle Quaternary; includes deposits of higher gradient tributaries bordering major stream valleys, alluvial veneers of the piedmont slope, and alluvial fans

Lithology: alluvium

alluvium (Phanerozoic | Cenozoic | Quaternary) at surface, covers 9 % of this area

Alluvium; upper and middle Quaternary

Lithology: alluvium

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 5 % of this area

Ogallala Formation, alluvial and eolian deposits, and petrocalcic soils of the southern High Plains; Lower Pliocene to middle Miocene (locally includes unit Qoa)

Lithology: alluvium; eolian; carbonate

Upper Santa Fe Group (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 5 % of this area

Upper Santa Fe Group. Includes Camp Rice, Fort Hancock, Palomas, Sierra Ladrones, Ancha, Puye, and Alamosa Formations; middle Pleistocene to uppermost Miocene

eolian deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 3 % of this area

Eolian deposits

Lithology: eolian

Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 2 % of this area

Chinle Group; Upper Triassic; includes Moenkopi Formation (Middle Triassic) at base in many areas; in eastern part of state the following five formations are mapped:

basalt and andesite flows, Neogene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 2 % of this area

Basalt and andesite flows; Neogene. Includes flows interbedded with Santa Fe and Gila Groups

Lithology: basalt; andesite

Yesa Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 2 % of this area

Yeso Formation; sandstones, siltstones, anhydrite, gypsum, halite, and dolomite; Leonardian

Dakota Group (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 2 % of this area

Dakota Group of east-central and northeast New Mexico; in ascending order, Mesa Rica Sandstone, Pajarito Shale, and Romeroville Sandstone; includes the underlying Tucumcari Shale in Tucumcari area and Glencairn Formation in Union County. Encompasses both Upper and Lower Cretaceous rocks

Gila Group (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 2 % of this area

Gila Group. Includes Mimbres Formation and several informal units in southwestern basins; Middle Pleistocene to uppermost Oligocene

upper Chinle Group (Garita Creek, Trujillo, Bull Canyon, and Redonda Formations) (Phanerozoic | Mesozoic | Triassic) at surface, covers 2 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

older alluvial deposits of upland plains and piedmont areas (Phanerozoic | Cenozoic | Quaternary) at surface, covers 2 % of this area

Older alluvial deposits of upland plains and piedmont areas, and calcic soils and eolian cover sediments of High Plains region; 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; upper Quaternary to uppermost Pliocene(?)

Lithology: alluvium

basaltic andesites (Phanerozoic | Cenozoic | Tertiary) at surface, covers 2 % of this area

Lower Miocene and uppermost Oligocene basaltic andesites (22-26 Ma). Includes Bearwallow Mountain Andesite and basaltic andesite of Mangas Mountain

Artesia Group (Phanerozoic | Paleozoic | Permian) at surface, covers 2 % of this area

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

rhyolitic pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 2 % of this area

Upper Oligocene rhyolitic pyroclastic rocks (ash-flow tuffs); includes Davis Canyon Tuff, South Crosby Peak Formation, La Jencia, Vick's Peak, Lemitar, South Canyon, Bloodgood Canyon, Shelley Peak Tuffs, tuff of Horseshoe Canyon, Park Tuff, Rhyolite Canyon Tuff, Apache Springs Tuff, Diamond Creek, Jordan Canyon, Garcia Camp Tuffs, the Turkey Springs Tuff, the tuff of Little Mineral Creek, the Amalia Tuff, and others. Some contain volcaniclastic and reworked volcaniclastic rocks, and eolian sandstone; (24-29 Ma)

silicic pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 2 % of this area

Lower Oligocene silicic pyroclastic rocks (ash-flow tuffs); includes Hell's Mesa, Kneeling Nun, lower part of Bell Top Formation, Caballo Blanco, Datil Well, Leyba Well, Rock House Canyon, Blue Canyon, Sugarlump and Tadpole Ridge Tuffs, the tuffs of the Organ cauldron, Treasure Mountain Tuff (now known as Chiquito Peak Tuff), Bluff Creek Tuff, Oak Creek Tuff, tuff of Steins Mountain, tuff of Black Bill Canyon, tuff of Farr Ranch, Woodhaul Canyon, Gillespie and Box Canyon Tuffs, Cooney Tuff, and other volcanic and interbedded fluvial and pumiceous units; (31-36.5 Ma)

lacustrine and playa-lake deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 2 % of this area

Lacustrine and playa-lake deposits; includes associated alluvial and eolian deposits of major lake basins; upper Quaternary

Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 2 % of this area

Mancos Shale; divided into Upper and Lower parts by Gallup Sandstone

Kirtland and Fruitland Formations (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 1 % of this area

Kirtland and Fruitland Formations; coal-bearing, coal primarily in the Fruitland; Campanian to Maastrichtian

Lithology: sandstone; mudstone; coal

Pierre Shale and Niobrara Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 1 % of this area

Pierre Shale and Niobrara Formation

sedimentary and vocaniclastic sedimentary rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 1 % of this area

Mostly Oligocene and upper Eocene sedimentary and volcaniclastic sedimentary rocks with local andesitic to intermediate volcanics; includes Espinaso, Spears, Bell Top, and Palm Park Formations

Crevasse Canyon Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 1 % of this area

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

basalt or basaltic andesite (Phanerozoic | Cenozoic | Quaternary) at surface, covers 1 % of this area

Basalt or basaltic andesite; middle and lower Pleistocene

San Andres Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 1 % of this area

San Andres Formation; limestone and dolomite with minor shale; Guadalupian in south, in part Leonardian to north

landslide deposits and colluvium (Phanerozoic | Cenozoic | Quaternary) at surface, covers 1 % of this area

Landslide deposits and colluvium

Lithology: landslide; colluvium

Pennsylvanian rocks, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers 1.0 % of this area

Pennsylvanian rocks, undivided; in Sangre de Cristo Mountains may include Sandia Formation, Madera Limestone, La Pasada, Alamitos, and Flechado Formations; elsewhere may include Bar-B, Nakaye, Red House, Oswaldo, and Syrena Formations

Permain and Pennsylvanian rocks, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian) at surface, covers 1.0 % of this area

Permian and Pennsylvanian rocks, undivided; includes Horquilla Limestone, Earp Formation, Epitaph and Scherrer Formations, and Concha Limestone

silicic flows and massess and associated pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 1.0 % of this area

Upper Oligocene silicic (or felsic) flows and masses and associated pyroclastic rocks; includes Taylor Creek, Fanney, and Rocky Canyon Rhyolites

Lower and Middle Santa Fe Group (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.9 % of this area

Lower and Middle Santa Fe Group. Includes Hayner Ranch, Rincon Valley, Popotosa, Cochiti, Tesuque, Chamita, Abiquiu, and other Formations; Miocene and uppermost Oligocene

Glorieta Sandstone (Phanerozoic | Paleozoic | Permian) at surface, covers 0.9 % of this area

Glorieta Sandstone; texturally and mineralogically mature, high-silica quartz sandstone

Lithology: sandstone

andesites and basaltic andesites (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.9 % of this area

Upper Oligocene andesites and basaltic andesites (26-29 Ma); includes La Jara Peak Basaltic Andesite, Uvas Basalt, the basaltic andesite of Poverty Creek, and Squirrel Springs Andesite, the Razorback, Bear Springs Canyon, Salt Creek, Gila Flat, and Middle Mountain Formations, and the Alum Mountain Group; locally includes more silicic flows

intertongued Dakota-Mancos sequence (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.8 % of this area

Intertongued Dakota-Mancos sequence of west-central New Mexico; includes the Whitewater Arroyo Tongue of Mancos Shale and the Twowells Tongue of the Dakota

basalt and andesite flows and vent deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.8 % of this area

Basalt and andesite flows and locally vent deposits

Lithology: andesite; basalt

Raton Formation (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers 0.7 % of this area

Raton Formation; in Raton Basin; unit contains conformable K/T boundary

andesite and basaltic andesite flows and associated volcaniclastic units (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.7 % of this area

Lower Tertiary, (Lower Oligocene and Eocene) andesite and basaltic andesite flows, and associated volcaniclastic units. Includes Rubio Peak Formation, and andesite of Dry Leggett Canyon

sedimentary units, Palogene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.7 % of this area

Paleogene sedimentary units; includes Baca, Galisteo, El Rito, Blanco Basin, Love Ranch, Lobo, Sanders Canyon, Skunk Ranch, Timberlake, and Cub Mountain Formations

Dakota Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.7 % of this area

Dakota Sandstone; includes Oak Canyon, Cubero, and Paguate Tongues plus Clay Mesa Tongue of Mancos Shale; Cenomanian

plutonic rocks, middle Proterozoic (Proterozoic | Mesoproterozoic) at surface, covers 0.7 % of this area

Middle Proterozoic plutonic rocks (younger than 1600 Ma)

basalt and andesite flows, Miocene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.7 % of this area

Basalt and andesite flows; Miocene

Lithology: basalt; andesite

Morrison Formation (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.7 % of this area

Morrison Formation; Upper Jurassic nonmarine rocks present only in northern one-third of state

Mesaverde Group (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.7 % of this area

Mesaverde Group includes the Gallup Sandstone, Crevasse Canyon Formation, Point Lookout Sandstone, Menefee Formation, and Cliff House Sandstone

metamorphic rocks (Proterozoic | Paleoproterozoic) at surface, covers 0.6 % of this area

Lower Proterozoic metamorphic rocks, dominantly felsic volcanic, volcaniclastic and plutonic rocks (1650-1700+ Ma); includes Vadito Group; locally includes high-grade felsic gneisses of unknown age

Abo Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.6 % of this area

Abo Formation; 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

Mancos Shale, lower part (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.6 % of this area

Mancos Shale, Lower part

plutonic rocks, Lower Proterozoic (Proterozoic | Paleoproterozoic) at surface, covers 0.6 % of this area

Lower Proterozoic plutonic rocks (older than 1600 Ma)

San Jose Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.6 % of this area

San Jose Formation; Eocene, San Juan Basin

Mancos Shale, upper part (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.6 % of this area

Mancos Shale, Upper part

Nacimiento Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.6 % of this area

Nacimiento Formation; Paleocene, San Juan Basin

Santa Fe Group (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 0.5 % of this area

Santa Fe Group, undivided. Basin fill of Rio Grande rift region; middle Pleistocene to uppermost Oligocene

older piedmont alluvial deposits and shallow basin fill (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 0.5 % of this area

Older piedmont alluvial deposits and shallow basin fill; includes Quemado Formation and in northeast, high level pediment gravels

Los Pinos Formation of Lower Santa Fe Group (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.5 % of this area

Los Pinos Formation of Lower Santa Fe Group (Miocene and upper Oligocene); includes Carson Conglomerate (Dane and Bachman, 1965) in Tusas Mountains-San Luis Basin area

silicic to intermediate volcanic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.5 % of this area

Silicic to intermediate volcanic rocks; mainly quartz latite and rhyolite Neogene; may locally include flows interbedded with Santa Fe Group

San Rafael Group (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.5 % of this area

San Rafael Group; consists of Entrada Sandstone, Todilto and Summerville Formations, Bluff Sandstone, and locally Zuni Sandstone (or only Acoma Tongue of Zuni)

Morrison Formation and upper San Rafael Group (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.5 % of this area

Morrison Formation and upper San Rafael Group

Bandelier Tuff (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.5 % of this area

Bandelier Tuff; Jemez Mountains area only

Lithology: rhyolite; tuff; pumice

Madera Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers 0.5 % of this area

Madera Formation (Limestone, or Group); in Manzano Mountains includes Los Moyos Limestone and Wild Cow Formation; in Lucero Mesa includes Gray Mesa, Atrasdo, and Red Tanks Members; in Sacramento Mountains includes Beeman and Holder Formations; may include strata lumped as Magdalena Group in a few areas

intrusive rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.4 % of this area

Tertiary intrusive rocks; undifferentiated

Bull Canyon Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 0.4 % of this area

Bull Canyon Formation; Norian

Grayburg and Queen Fromations (Phanerozoic | Paleozoic | Permian) at surface, covers 0.4 % of this area

Grayburg and Queen Formations; sandstone, gypsum, anhydrite, dolomite, and red mudstone; Guadalupian

Point Lookout Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.4 % of this area

Point Lookout Sandstone; 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; Santonian - Campanian

Lithology: sandstone; arkose

Lewis Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.4 % of this area

Lewis Shale; marine shale and mudstone

volcanic rocks, lower Oligocene and Eocene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.4 % of this area

Lower Oligocene and Eocene volcanic rocks, undifferentiated; dominantly intermediate composition, with interbedded volcaniclastic rocks; (31-44 Ma)

upper Tertiary sedimentary units (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.4 % of this area

Upper Tertiary sedimentary units; includes Bidahochi Formation, the Picuris Formation, and Las Feveras Formation, and locally fanglomerates; Pliocene to upper Miocene

Fence Lake Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.4 % of this area

Fence Lake Formation; conglomerate and conglomeratic sandstone, coarse fluvial volcanoclastic sediments, minor eolian facies, and pedogenic carbonates of the southern Colorado Plateau region; Miocene

basalt and andesite flows, Pliocene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.4 % of this area

Basalt and andesite flows; Pliocene

Lithology: basalt; andesite

gypsiferous eolian deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.4 % of this area

Gypsiferous eolian deposits

Lithology: eolian

Moreno Hill Formation and Atarque Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % of this area

Moreno Hill Formation and Atarque Sandstone; in Salt Lake coal field and extreme southern Zuni basin; Turonian

Lithology: sandstone; shale; coal

Graneros Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % of this area

Graneros Shale; limited to northeastern area; Cenomanian

Rio Salado Tongue of Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % of this area

Rio Salado Tongue of the Mancos Shale. 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; Turonian

Lithology: shale; limestone

Poison Canyon Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area

Poison Canyon Formation; Paleocene, Raton Basin

Lithology: sandstone

Hueco Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.3 % of this area

Hueco Formation; limestone unit restricted to south-central area; Pendejo Tongue divides Abo Formation into upper and lower parts; Wolfcampian

Carlile Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % of this area

Carlile Shale; limited to northeastern area; Turonian-Coniacian

San Andres Limestone and Glorieta Sandstone (Phanerozoic | Paleozoic | Permian) at surface, covers 0.3 % of this area

San Andres Limestone and Glorieta Sandstone; Guadalupian and Leonardian

silicic flows, domes, and associated pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area

Lower Oligocene silicic (or felsic) flows, domes, and associated pyroclastic rocks and intrusions; includes Mimbres Peak Formation

Greenhorn Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % of this area

Greenhorn Formation; 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

Lithology: shale; limestone

Tres Hermanos Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % of this area

Tres Hermanos Formation; formerly designated as Lower Gallup Sandstone in the Zuni Basin; Turonian

Lithology: sandstone

volcanic rocks, Neogene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area

Neogene volcanic rocks; primarily in Jemez Mountains

plutonic rocks, middle and lower Proterozoic (Proterozoic | Paleoproterozoic Mesoproterozoic) at surface, covers 0.3 % of this area

Middle and Lower Proterozoic plutonic rocks, undivided

Rustler Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.3 % of this area

Rustler Formation; siltstone, gypsum, sandstone, and dolomite; Upper Permian

Yates and Tansill Formations (Phanerozoic | Paleozoic | Permian) at surface, covers 0.3 % of this area

Yates and Tansill Formations; sandstone, siltstone, limestone, dolomite, and anhydrite; Guadalupian

middle and upper Jurassic rocks, unidivided (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.3 % of this area

Jurassic rocks, Middle and Upper, undivided

volcanic and some volcaniclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.2 % of this area

Volcanic and some volcaniclastic rocks, undifferentiated; lower Miocene and Upper Oligocene (younger than 29 Ma)

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

Lower Proterozoic metasedimentary rocks (1650-1700 Ma). Essentially equivalent to Hondo Group; locally includes high-grade quartzite-pelitic schist of unknown age

Entrada Sandstone (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.2 % of this area

Entrada Sandstone, Middle Jurassic; Callovian

Lithology: sandstone

Seven Rivers Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.2 % of this area

Seven Rivers Formation; gypsum, anhydrite, salt, dolomite, and siltstone; Guadalupian

Garita Creek Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 0.2 % of this area

Garita Creek Formation; Carnian

Animas Formation (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers 0.2 % of this area

Animas Formation; in northeast San Juan Basin

Lithology: clay or mud; tuff; clastic

Pictured Cliffs Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area

Pictured Cliffs Sandstone; prominent cliff-forming marine sandstone

Lithology: sandstone; mudstone

Santa Rosa Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 0.2 % of this area

Santa Rosa Formation; Carnian; includes Moenkopi Formation (Middle Triassic) at base in most areas

Chuska Sandstone (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.2 % of this area

Chuska Sandstone; restricted to Chuska Mountains

Lithology: sandstone

Cliff House Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area

Cliff House Sandstone; transgressive marine sandstone; Campanian

Lithology: sandstone; shale

Menefee Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area

Menefee Formation; mudstone, shale, and sandstone; coal-bearing

Gallup Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area

Gallup Sandstone; generally regressive marine sandstone; Turonian

Lithology: sandstone

Satan Tongue of Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area

Satan Tongue of Mancos Shale

Lithology: shale

Graneros Shale and Greenhorn Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area

Graneros Shale and Greenhorn Formation; limited to northeastern area; lower Turonian and Cenomanian

Lithology: shale; limestone

mafic metamorphic rocks, lower Proterozoic (Proterozoic | Paleoproterozoic) at surface, covers 0.2 % of this area

Lower Proterozoic metamorphic rocks, dominantly mafic (1720-1760 Ma)

basaltic and andesitic volcanics interbedded with sedimentary units (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 0.1 % of this area

Basaltic and andesitic volcanics interbedded with Pleistocene and Pliocene sedimentary units

Zuni and Entrada Sandstones (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.1 % of this area

Zuni and Entrada Sandstones, undivided

quartz monzonites, intermediate intrusives, and other intermediate felsic dikes and plugs (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.1 % of this area

Quartz monzonites (Eocene) in the Silver City and Los Pinos Range, intermediate intrusives of the Cooke's Range (Oligocene), and other intermediate to felsic dikes and plugs of Oligocene and Eocene age

Salado Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.1 % of this area

Salado Formation; evaporite sequence; Upper Permian

Lithology: evaporite; sandstone

Castile Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.1 % of this area

Castile Formation; dominantly anhydrite sequence; Upper Permian

Lithology: evaporite; limestone

Cutler Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.1 % of this area

Cutler Formation; used in northern areas and Chama embayment only

silicic to intermediate intrusive rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.1 % of this area

Miocene to Oligocene silicic to intermediate intrusive rocks; dikes, stocks, plugs, and diatremes

Mulatto Tongue of Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.1 % of this area

Mulatto Tongue of Mancos Shale

Lithology: shale; sandstone

Silurian through Cambrian rocks, undivided (Phanerozoic | Paleozoic | Cambrian Ordovician(?) Silurian) at surface, covers 0.1 % of this area

Silurian through Cambrian rocks, undivided

Lithology: sedimentary rock

Permian Rocks, undivided (Phanerozoic | Paleozoic | Permian) at surface, covers 0.1 % of this area

Permian rocks, undivided

Lithology: sedimentary rock

Pescado Tongue of the Mancos Shale and Gallup Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.1 % of this area

Pescado Tongue of the Mancos Shale and Gallup Sandstone; in Zuni Basin only. Pescado is chrono-stratigraphic equivalent of Juana Lopez Member of Mancos Shale; Turonian

Lithology: sandstone; shale

Trujillo Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 0.1 % of this area

Trujillo Formation; Norian

volcanic rocks, middle Tertiary (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.1 % of this area

Middle Tertiary volcanic rocks, undifferentiated

Gallup Sandstone and underlying D-Cross Tongue of Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

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

Lithology: sandstone; shale

Fort Hayes Limestone Member of Niobrara Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Fort Hays Limestone Member of Niobrara Formation

Lithology: limestone; shale

Lower Cretaceous, unidivided (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Lower Cretaceous, undivided; in northern Lea and Roosevelt Counties includes equivalents of Tucumcari Shale. In Cornudas Mountains includes Campogrande, Cox and other Washita Group formations, and the Boquillas Formation; Cenomanian. In the southwest includes Hell-To-Finish, U-Bar, and Mojado Formations which are equivalent to Bisbee Group of Arizona

andesitic volcanics (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers < 0.1 % of this area

Andesitic volcanics

Mancos Formation and Beartooth Quartzite (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Mancos Formation and Beartooth Quartzite (and Sarten Sandstone); Mancos includes what was formerly referred to as Colorado Shale which in turn may include equivalents of Tres Hermanos Formation

Hinsdale Basalt (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area

Hinsdale Basalt; northern Taos and eastern Rio Arriba Counties; basalt flows interbedded with Los Pinos Formation

Lithology: basalt; rhyolite; alluvium

Bursum Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Bursum Formation; shale, arkose, and limestone; earliest Permian

continental red beds (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area

Triassic rocks, undivided; continental red beds

basaltic volcanics (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area

Basaltic volcanics; tuff rings, cinders, and proximal lavas

Lithology: basalt; pyroclastic

intrusive rocks, Paleogene and Upper Cretatceous (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers < 0.1 % of this area

Paleogene and Upper Cretaceous intrusive rocks; includes Hanover, Fierro, Tyrone, and Lordsburg granodiorite-quartz monzonite porphyries

Lithology: granodiorite; granitoid

Mississippian and Devonain rocks, undivided (Phanerozoic | Paleozoic | Devonian Carboniferous Mississippian) at surface, covers < 0.1 % of this area

Mississippian and Devonian rocks, undivided; includes the Lake Valley Limestone, Caballero, Las Cruces, Rancheria, and Helms Formations and Escabrosa Group; Mississippian; the Onate, Sly Gap, Contadero Formations, and Percha Shale of south-central New Mexico, and Canutillo Formation of Northern Franklin Mountains and Bishops Cap area; Devonian

Mississippian rocks, undivided (Phanerozoic | Paleozoic | Carboniferous Mississippian) at surface, covers < 0.1 % of this area

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

undivided, Upper Cretaceous (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Upper Cretaceous, undivided. Includes Virden Formation in northern Hidalgo County, Ringbone Formation in Hidalgo and Luna and Grant Counties, and locally Beartooth and Sarten, Mancos in Silver City area; Cenomanian - Maastrichtian for most part, although Beartooth is pre-Cenomanian

Vermejo Formation and Trinidad Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Vermejo Formation and Trinidad Sandstone; Maastrichtian

Lithology: sandstone; shale; coal

Missippian through Cambrian rocks, undivided (Phanerozoic | Paleozoic | Cambrian Ordovician(?) Silurian(?) Devonian(?) Carboniferous Mississippian) at surface, covers < 0.1 % of this area

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

Lithology: carbonate; clastic

Valles Rhyolite (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area

Valles Rhyolite; Jemez Mountains area only

felsic shallow-intrusive rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area

Middle Tertiary felsic shallow-intrusive rocks; phonolites and trachytes of northeastern N.M.; includes the rhyolite of Ash Mountain

Panther Seep Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area

Panther Seep Formation; Organ, Franklin, and San Andres Mountains

Hosta Tongue of Point Lookout Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Hosta Tongue of Point Lookout Sandstone; transgressive marine sandstone

Lithology: sandstone

silicic volcanic rocks (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area

Silicic volcanic rocks

Ojo Alamo Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area

Ojo Alamo Formation; Paleocene, San Juan Basin

travertine (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers < 0.1 % of this area

Travertine

Lithology: limestone

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

Rock Point Formation of Chinle Group; Upper Triassic. May locally include Lukachukai Member of Wingate Sandstone

Lithology: sandstone; siltstone

Sandia Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area

Sandia Formation; predominately clastic unit (commonly arkosic) with minor black shales, and limestone in lower part; locally includes Osha Canyon Formation in Nacimiento Mountains

Redonda Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area

Redonda Formation

Quatermaster and Rustler Formations (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Quartermaster and Rustler Formations; Upper Permian

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

Dakota Sandstone and Rio Salado Tongue of the Mancos Shale. In northwest Socorro County locally includes overlying Tres Hermanos Formation

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

Paleozoic rocks, undivided

Lithology: sedimentary rock

Lead Camp Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area

Lead Camp Formation; San Andres and Organ Mountains

Yeso, Glorieta, and San Andres Formations, undivided (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Yeso, Glorieta and San Andres Formations, undivided

Capitan Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Capitan Formation; Upper Guadalupian age limestone (reef facies)

Lithology: carbonate

McRae Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

McRae Formation; Engle basin - Cutter sag area; Maastrichtian

playa (None) at surface, covers < 0.1 % of this area

Lithology: playa

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

Cretaceous rocks, undivided

Sangre de Cristo Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian) at surface, covers < 0.1 % of this area

Sangre de Cristo Formation, in Sangre de Cristo Mountains

Poison Canyon and Raton Fromations (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers < 0.1 % of this area

Poison Canyon and Raton Formations; undivided

Ordovician to Cambrian plutonic rocks of Florida Mountains (Phanerozoic | Paleozoic | Cambrian Ordovician) at surface, covers < 0.1 % of this area

Ordovician-Cambrian plutonic rocks of Florida Mountains

glacial deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area

Glacial deposits; till and outwash: upper and middle Pleistocene

andesite flows (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Uppermost Cretaceous andesite flows; restricted to southwestern area

Lithology: andesite

Quartermaster Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Quartermaster Formation; red sandstone and siltstone; Upper Permian

Greenhorn Formation and Carlile Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Greenhorn Formation and Carlile Shale, undivided; locally includes Graneros Shale

mafic intrusive rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area

Upper and Middle Tertiary mafic intrusive rocks

Abo Formation, lower part (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Lower part of Abo Formation; Wolfcampian, and in part Virgilian ?

Zuni Sandstone (Phanerozoic | Mesozoic | Jurassic) at surface, covers < 0.1 % of this area

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

Lithology: sandstone; shale

metamorphic rocks, lower Proterozoic (Proterozoic | Paleoproterozoic) at surface, covers < 0.1 % of this area

Lower Proterozoic metamorphic rocks, undivided

Lithology: metamorphic rock

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

Ordovician and Cambrian rocks, undivided; includes Bliss Sandstone, El Paso Formation, and Montoya Formation (or Group)

Lithology: sedimentary rock

Cherry Canyon Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Cherry Canyon Formation; basin facies-sandstone, limestone, and shale

Lithology: sandstone; limestone; shale

Abo Formation, upper part (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Upper part of Abo Formation; Wolfcampian

Lithology: sandstone; shale

lower Proterozoic rocks, undivided (Proterozoic | Paleoproterozoic) at surface, covers < 0.1 % of this area

Lower Proterozoic rocks, undivided

Lithology: indeterminate

Madera Limestone, exotic blocks (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area

Madera Limestone, exotic blocks; present only in the Chloride area of Sierra County

Lithology: limestone

Moenkopi Formation (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area

Moenkopi Formation; Middle Triassic

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

Silurian and Ordovician rocks, undivided

Lithology: sedimentary rock

Cutoff Shale (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Cutoff Shale; in Brokeoff Mountains only

Lithology: shale

Victoria Peak Limestone (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Victorio Peak Limestone; in Brokeoff Mountains only

Lithology: limestone

Abo and Yeso Formations (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Abo and Yeso Formations, undivided

sand deposits, undivided (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

sand deposits, undivided

Lithology: sand; silt

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

Blackwater Draw Formation

Lithology: sand; silt; clay or mud

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers < 0.1 % of this area

Ogallala Formation

Percha Shale (Phanerozoic | Paleozoic | Devonian) at surface, covers < 0.1 % of this area

Percha Shale; southern Caballo Mountains; includes the Onate and Sly Gap Formations

Lithology: shale; limestone

Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | 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.

disturbed ground (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

disturbed ground, manmade

Lithology: indeterminate

Bell Canyon Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area

Bell Canyon Formation; basin facies-sandstone, limestone, and shale; Guadalupian

Lithology: sandstone; limestone; shale

La Ventana Tongue (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

La Ventana Tongue of the Cliff House Sandstone

Lithology: sandstone; shale

Dakota Sandstone (Phanerozoic | Mesozoic | Cretaceous-Early ) 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.

Lithology: sandstone; shale

intrusive rocks, uppermost Cretaceous (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Uppermost Cretaceous intrusive rocks; restricted to Copper Flats area in Sierra County

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

Includes Broadway and Louviers Alluviums

Lithology: gravel; alluvium

Basalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite (Phanerozoic | Cenozoic | 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

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

Includes several named units

sedimentary rocks of the Sacramento Mountains (Proterozoic | Mesoproterozoic) at surface, covers < 0.1 % of this area

Middle Proterozoic sedimentary rocks of the Sacramento Mountains

sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

sand sheet deposits

Lithology: sand; silt

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

Quaternary-Tertiary bolson deposits

caliche deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

caliche deposits

Lithology: evaporite

dune sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

dune sand sheet deposits

Lithology: sand; silt

Hueco Limestone (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area

Hueco Limestone

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

Intertongues complexly with units overlying Mesaverde Group or Formation; 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

Lithology: shale; sandstone

Granitic rocks of 1400-m.y. age group (Proterozoic | Mesoproterozoic) 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 (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area

Lithology: shale; limestone

alluvial fan deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

alluvial fan deposits

Lithology: alluvial fan

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

Lithology: sandstone; shale

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

Includes Piney Creek Alluvium and younger deposits

Lithology: alluvium

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

Lithology: shale

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

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

Cretaceous rocks, undivided

Dockum Group (Phanerozoic | Mesozoic | Triassic-Late ) 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.

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

Terrace deposits

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

Lithology: shale; limestone

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

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

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

Quartzite, conglomerate, and interlayered mica schist

Leona Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area

Leona Formation

Lithology: sand; gravel; clay or mud

Purgatoire Formation (Phanerozoic | Mesozoic | Cretaceous-Early ) 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.

Mesaverde Fm, undivided (Phanerozoic | Mesozoic | 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.

Lithology: sandstone; shale; coal

bolson deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

bolson deposits

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

Trujillo Formation

sand dune deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

sand dune deposits

Lithology: sand; silt

Mingus Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]) at surface, covers < 0.1 % of this area

Mingus Formation

Lithology: shale; sandstone; limestone; coal

Los Pinos Fm (Phanerozoic | Cenozoic | 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

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)

Lithology: gravel; sand; mud; silt

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

Shale, sandstone, and major coal beds; sandstone

Lithology: sandstone; shale; coal

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

Siltstone, sandstone, and conglomerate

Raton Fm (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers < 0.1 % of this area

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

Lithology: sandstone; mudstone; coal

Biotitic gneiss, schist, and migmatite (Proterozoic | Paleoproterozoic) 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 (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian) at surface, covers < 0.1 % of this area

Arkosic conglomerate, sandstone, and siltstone

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

Arkosic conglomerate, sandstone, and shale

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

Loose to well-cemented sand and gravel

Lithology: sandstone; conglomerate

Alluvium (Phanerozoic | Cenozoic | Quaternary | 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

Lithology: alluvium

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

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

Lithology: sandstone

Basalt (Phanerozoic | Cenozoic | Tertiary | 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.

Lithology: basalt

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

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

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

sand, silt, clay, and gravel. locally indurated with calcium carbonate (caliche); includes point bar, natural levee, stream channel, sand dune, terrace, alluvial fan, landslide bolson and playa deposits

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)