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Mineral Resources > Online Spatial Data > Geology > by state > New Mexico Geology

Geologic units in New Mexico (state in United States)

[Additional scientific data in this geographic area]

Permain and Pennsylvanian rocks, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian) at surface, covers 0.9 % of this area
Permian and Pennsylvanian rocks, undivided; includes Horquilla Limestone, Earp Formation, Epitaph and Scherrer Formations, and Concha Limestone
Lithology: medium-grained mixed clastic; carbonate
Abo Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.4 % 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
Lithology: sandstone; shale; conglomerate; limestone
Yesa Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 2 % of this area
Yeso Formation; sandstones, siltstones, anhydrite, gypsum, halite, and dolomite; Leonardian
Lithology: sandstone; limestone; mudstone; evaporite
Blackwater Draw Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area
Blackwater Draw Formation
Lithology: sand; silt; clay or mud
middle and upper Jurassic rocks, unidivided (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.3 % of this area
Jurassic rocks, Middle and Upper, undivided
Lithology: clastic; sedimentary rock
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:
Lithology: medium-grained mixed clastic; fine-grained mixed clastic; limestone; chert; evaporite
intertongued Dakota-Mancos sequence (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.7 % 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
Lithology: fine-grained mixed clastic; medium-grained mixed clastic; limestone
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
Lithology: sandstone; carbonate; fine-grained mixed clastic; evaporite
silicic volcanic rocks (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Silicic volcanic rocks
Lithology: volcanic rock (aphanitic)
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
Lithology: metasedimentary rock
eolian deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 6 % of this area
Eolian deposits
Lithology: eolian
Mesaverde Group (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.4 % of this area
Mesaverde Group includes the Gallup Sandstone, Crevasse Canyon Formation, Point Lookout Sandstone, Menefee Formation, and Cliff House Sandstone
Lithology: sandstone; fine-grained mixed clastic; conglomerate; coal
McRae Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area
McRae Formation; Engle basin - Cutter sag area; Maastrichtian
Lithology: shale; sandstone; siltstone; conglomerate
Rio Salado Tongue of Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % 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
basalt and andesite flows and vent deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.7 % of this area
Basalt and andesite flows and locally vent deposits
Lithology: andesite; basalt
basalt or basaltic andesite (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.8 % of this area
Basalt or basaltic andesite; middle and lower Pleistocene
Lithology: basalt; mafic volcanic rock; intermediate volcanic rock
landslide deposits and colluvium (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.8 % of this area
Landslide deposits and colluvium
Lithology: landslide; colluvium
Sandia Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers 0.3 % 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
Lithology: sandstone; shale; limestone; conglomerate
alluvium (Phanerozoic | Cenozoic | Quaternary) at surface, covers 8 % of this area
Alluvium; upper and middle Quaternary
Lithology: alluvium
Tres Hermanos Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area
Tres Hermanos Formation; formerly designated as Lower Gallup Sandstone in the Zuni Basin; Turonian
Lithology: sandstone
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
Lithology: medium-grained mixed clastic; volcanic rock (aphanitic); limestone
mafic metamorphic rocks, lower Proterozoic (Proterozoic | Paleoproterozoic) at surface, covers 0.1 % of this area
Lower Proterozoic metamorphic rocks, dominantly mafic (1720-1760 Ma)
Lithology: mafic metavolcanic rock
Dakota Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.5 % of this area
Dakota Sandstone; includes Oak Canyon, Cubero, and Paguate Tongues plus Clay Mesa Tongue of Mancos Shale; Cenomanian
Lithology: medium-grained mixed clastic
Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 1.0 % of this area
Mancos Shale; divided into Upper and Lower parts by Gallup Sandstone
Lithology: shale; fine-grained mixed clastic
plutonic rocks, Lower Proterozoic (Proterozoic | Paleoproterozoic) at surface, covers 0.4 % of this area
Lower Proterozoic plutonic rocks (older than 1600 Ma)
Lithology: plutonic rock (phaneritic)
andesites and basaltic andesites (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.6 % 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
Lithology: andesite; basalt; intermediate volcanic rock; mafic volcanic rock; felsic volcanic rock; rhyolite
intrusive rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area
Tertiary intrusive rocks; undifferentiated
Lithology: plutonic rock (phaneritic)
lacustrine and playa-lake deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 1 % of this area
Lacustrine and playa-lake deposits; includes associated alluvial and eolian deposits of major lake basins; upper Quaternary
Lithology: lake or marine deposit (non-glacial); alluvium; eolian
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
Lithology: limestone; medium-grained mixed clastic
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
Lithology: conglomerate; sandstone; basalt
Morrison Formation (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.5 % of this area
Morrison Formation; Upper Jurassic nonmarine rocks present only in northern one-third of state
Lithology: fine-grained mixed clastic; limestone
basalt and andesite flows, Pliocene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area
Basalt and andesite flows; Pliocene
Lithology: basalt; andesite
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
Lithology: shale; sandstone; medium-grained mixed clastic
older alluvial deposits of upland plains and piedmont areas (Phanerozoic | Cenozoic | Quaternary) at surface, covers 4 % 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
Lewis Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.4 % of this area
Lewis Shale; marine shale and mudstone
Lithology: shale; fine-grained mixed clastic; limestone
Permian Rocks, undivided (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Permian rocks, undivided
Lithology: sedimentary rock
Mancos Shale, lower part (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.4 % of this area
Mancos Shale, Lower part
Lithology: shale; fine-grained mixed clastic
Graneros Shale and Greenhorn Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.1 % of this area
Graneros Shale and Greenhorn Formation; limited to northeastern area; lower Turonian and Cenomanian
Lithology: shale; limestone
Pennsylvanian rocks, undivided (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers 0.7 % 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
Lithology: sedimentary rock; medium-grained mixed clastic; carbonate
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)
Lithology: fine-grained mixed clastic; coal
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
Lithology: coarse-grained mixed clastic; unconsolidated deposit; tuff; chert
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
rhyolitic pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 1 % 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)
Lithology: tuff; pyroclastic; rhyolite; andesite; mixed clastic/volcanic; eolian
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
Hueco Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.2 % of this area
Hueco Formation; limestone unit restricted to south-central area; Pendejo Tongue divides Abo Formation into upper and lower parts; Wolfcampian
Lithology: limestone; shale; conglomerate
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
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
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
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
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
Lithology: sandstone; medium-grained mixed clastic
Mancos Shale, upper part (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.4 % of this area
Mancos Shale, Upper part
Lithology: shale; fine-grained mixed clastic
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
silicic pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 1 % 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)
Lithology: pyroclastic; tuff; felsic volcanic rock; volcanic rock (aphanitic); mixed clastic/volcanic
Satan Tongue of Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.1 % of this area
Satan Tongue of Mancos Shale
Lithology: shale
Entrada Sandstone (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.3 % of this area
Entrada Sandstone, Middle Jurassic; Callovian
Lithology: sandstone
Paleozoic rocks, undivided (Phanerozoic | Paleozoic) at surface, covers < 0.1 % of this area
Paleozoic 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
older piedmont alluvial deposits and shallow basin fill (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 0.4 % of this area
Older piedmont alluvial deposits and shallow basin fill; includes Quemado Formation and in northeast, high level pediment gravels
Lithology: alluvium; unconsolidated deposit
gypsiferous eolian deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.3 % of this area
Gypsiferous eolian deposits
Lithology: eolian
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
Lithology: basalt; andesite; sedimentary rock
Nacimiento Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 1 % of this area
Nacimiento Formation; Paleocene, San Juan Basin
Lithology: sandstone; shale; conglomerate
Bursum Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Bursum Formation; shale, arkose, and limestone; earliest Permian
Lithology: shale; sandstone; conglomerate; limestone
San Jose Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 2 % of this area
San Jose Formation; Eocene, San Juan Basin
Lithology: medium-grained mixed clastic
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.
Lithology: sandstone; limestone; dolostone (dolomite); shale; conglomerate
Sangre de Cristo Fm (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian) at surface, covers < 0.1 % of this area
Arkosic conglomerate, sandstone, and siltstone
Lithology: conglomerate; sandstone; siltstone
plutonic rocks, middle Proterozoic (Proterozoic | Mesoproterozoic) at surface, covers 0.5 % of this area
Middle Proterozoic plutonic rocks (younger than 1600 Ma)
Lithology: plutonic rock (phaneritic)
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)
Lithology: sand; gravel; mud; silt
San Rafael Group (Phanerozoic | Mesozoic | Jurassic) at surface, covers 0.4 % 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)
Lithology: medium-grained mixed clastic; fine-grained mixed clastic; 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
Lithology: sandstone; medium-grained mixed clastic; limestone
sand deposits, undivided (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
sand deposits, undivided
Lithology: sand; silt
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 ?
Lithology: sandstone; shale; conglomerate
sedimentary and vocaniclastic sedimentary rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.8 % 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
Lithology: clastic; mixed clastic/volcanic; volcanic rock (aphanitic); unconsolidated deposit
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
Lithology: plutonic rock (phaneritic)
Glorieta Sandstone (Phanerozoic | Paleozoic | Permian) at surface, covers 0.8 % of this area
Glorieta Sandstone; texturally and mineralogically mature, high-silica quartz sandstone
Lithology: sandstone
Santa Rosa Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 1 % of this area
Santa Rosa Formation; Carnian; includes Moenkopi Formation (Middle Triassic) at base in most areas
Lithology: sandstone; mudstone; conglomerate
continental red beds (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area
Triassic rocks, undivided; continental red beds
Lithology: medium-grained mixed clastic
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
Lithology: quartz monzonite; granitoid
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
silicic to intermediate volcanic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.4 % of this area
Silicic to intermediate volcanic rocks; mainly quartz latite and rhyolite Neogene; may locally include flows interbedded with Santa Fe Group
Lithology: felsic volcanic rock; intermediate volcanic rock
playa (None) at surface, covers < 0.1 % of this area
Lithology: playa
travertine (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers < 0.1 % of this area
Travertine
Lithology: limestone
Gallup Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.1 % of this area
Gallup Sandstone; generally regressive marine sandstone; Turonian
Lithology: sandstone
basaltic andesites (Phanerozoic | Cenozoic | Tertiary) at surface, covers 1 % of this area
Lower Miocene and uppermost Oligocene basaltic andesites (22-26 Ma). Includes Bearwallow Mountain Andesite and basaltic andesite of Mangas Mountain
Lithology: andesite; basalt; intermediate volcanic rock; mafic volcanic rock
mafic intrusive rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Upper and Middle Tertiary mafic intrusive rocks
Lithology: plutonic rock (phaneritic)
San Andres Limestone and Glorieta Sandstone (Phanerozoic | Paleozoic | Permian) at surface, covers 0.2 % of this area
San Andres Limestone and Glorieta Sandstone; Guadalupian and Leonardian
Lithology: fine-grained mixed clastic; carbonate; evaporite
silicic flows and massess and associated pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.7 % of this area
Upper Oligocene silicic (or felsic) flows and masses and associated pyroclastic rocks; includes Taylor Creek, Fanney, and Rocky Canyon Rhyolites
Lithology: felsic volcanic rock; pyroclastic; rhyolite
basalt and andesite flows, Miocene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.5 % of this area
Basalt and andesite flows; Miocene
Lithology: basalt; andesite
volcanic rocks, lower Oligocene and Eocene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area
Lower Oligocene and Eocene volcanic rocks, undifferentiated; dominantly intermediate composition, with interbedded volcaniclastic rocks; (31-44 Ma)
Lithology: volcanic rock (aphanitic); intermediate volcanic rock; mixed clastic/volcanic
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
Lithology: carbonate; medium-grained mixed clastic
Menefee Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 2 % of this area
Menefee Formation; mudstone, shale, and sandstone; coal-bearing
Lithology: fine-grained mixed clastic; coal; limestone
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
Lithology: medium-grained mixed clastic; fine-grained mixed clastic; limestone
Ogallala Fm (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Loose to well-cemented sand and gravel
Lithology: sandstone; conglomerate
Bull Canyon Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 0.4 % of this area
Bull Canyon Formation; Norian
Lithology: mudstone; sandstone; conglomerate
Pictured Cliffs Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.1 % of this area
Pictured Cliffs Sandstone; prominent cliff-forming marine sandstone
Lithology: sandstone; mudstone
Upper Santa Fe Group (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 4 % 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
Lithology: clastic; unconsolidated deposit; mixed clastic/volcanic
Rustler Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.2 % of this area
Rustler Formation; siltstone, gypsum, sandstone, and dolomite; Upper Permian
Lithology: carbonate; fine-grained mixed clastic; evaporite
San Andres Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 7 % of this area
San Andres Formation; limestone and dolomite with minor shale; Guadalupian in south, in part Leonardian to north
Lithology: carbonate; fine-grained mixed clastic; evaporite
Grayburg and Queen Fromations (Phanerozoic | Paleozoic | Permian) at surface, covers 0.3 % of this area
Grayburg and Queen Formations; sandstone, gypsum, anhydrite, dolomite, and red mudstone; Guadalupian
Lithology: carbonate; sandstone; evaporite; shale; bentonite; mudstone
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
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
Santa Fe Group (Phanerozoic | Cenozoic | Tertiary Quaternary) at surface, covers 0.4 % of this area
Santa Fe Group, undivided. Basin fill of Rio Grande rift region; middle Pleistocene to uppermost Oligocene
Lithology: clastic; carbonate; lava flow; andesite
Redonda Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area
Redonda Formation
Lithology: sandstone; mudstone; limestone
Yates and Tansill Formations (Phanerozoic | Paleozoic | Permian) at surface, covers 0.2 % of this area
Yates and Tansill Formations; sandstone, siltstone, limestone, dolomite, and anhydrite; Guadalupian
Lithology: fine-grained mixed clastic; carbonate; evaporite
Zuni and Entrada Sandstones (Phanerozoic | Mesozoic | Jurassic) at surface, covers < 0.1 % of this area
Zuni and Entrada Sandstones, undivided
Lithology: sandstone; fine-grained mixed clastic
silicic flows, domes, and associated pyroclastic rocks (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.2 % of this area
Lower Oligocene silicic (or felsic) flows, domes, and associated pyroclastic rocks and intrusions; includes Mimbres Peak Formation
Lithology: lava flow; tuff; felsic volcanic rock; conglomerate; pyroclastic
upper Tertiary sedimentary units (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area
Upper Tertiary sedimentary units; includes Bidahochi Formation, the Picuris Formation, and Las Feveras Formation, and locally fanglomerates; Pliocene to upper Miocene
Lithology: clastic; mixed clastic/volcanic; volcanic rock (aphanitic); unconsolidated deposit
Animas Formation (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers 0.1 % of this area
Animas Formation; in northeast San Juan Basin
Lithology: clay or mud; tuff; clastic
Lead Camp Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area
Lead Camp Formation; San Andres and Organ Mountains
Lithology: limestone; shale; coarse-grained mixed clastic
Seven Rivers Formation (Phanerozoic | Paleozoic | Permian) at surface, covers 0.1 % of this area
Seven Rivers Formation; gypsum, anhydrite, salt, dolomite, and siltstone; Guadalupian
Lithology: evaporite; fine-grained mixed clastic; dolostone (dolomite)
volcanic rocks, Neogene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.2 % of this area
Neogene volcanic rocks; primarily in Jemez Mountains
Lithology: volcanic rock (aphanitic)
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
Abo Formation, upper part (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Upper part of Abo Formation; Wolfcampian
Lithology: sandstone; shale
metamorphic rocks (Proterozoic | Paleoproterozoic) at surface, covers 0.5 % 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
Lithology: felsic metavolcanic rock; plutonic rock (phaneritic); felsic gneiss
sedimentary units, Palogene (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.5 % 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
Lithology: medium-grained mixed clastic; tuff; limestone; sand; clay or mud
Pre-ash-flow andesitic lavas, breccias, tuffs, and conglomerates (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Includes several named units
Lithology: andesite; tuff; volcanic breccia (agglomerate)
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)
Lithology: volcanic rock (aphanitic); mixed clastic/volcanic
Gravels and alluviums (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Includes Broadway and Louviers Alluviums
Lithology: gravel; alluvium
Pierre Shale and Niobrara Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.9 % of this area
Pierre Shale and Niobrara Formation
Lithology: shale; fine-grained mixed clastic; limestone
andesite and basaltic andesite flows and associated volcaniclastic units (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.5 % 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
Lithology: andesite; basalt; intermediate volcanic rock; mafic volcanic rock; mixed clastic/volcanic
Poison Canyon Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % of this area
Poison Canyon Formation; Paleocene, Raton Basin
Lithology: sandstone
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
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
Lithology: clastic; mixed clastic/carbonate
Cretaceous rocks, undivided (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area
Cretaceous rocks, undivided
Lithology: limestone; shale; sandstone; mudstone
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
Lithology: plutonic rock (phaneritic)
volcanic rocks, middle Tertiary (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Middle Tertiary volcanic rocks, undifferentiated
Lithology: volcanic rock (aphanitic)
Niobrara Fm (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area
Calcareous shale and limestone
Lithology: shale; limestone
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
Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area
Terrace deposits
Lithology: terrace; sand; gravel; silt; clay or mud
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
Panther Seep Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers < 0.1 % of this area
Panther Seep Formation; Organ, Franklin, and San Andres Mountains
Lithology: fine-grained mixed clastic; limestone; evaporite
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
Lithology: plutonic rock (phaneritic)
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
Lithology: fine-grained mixed clastic; sedimentary rock; limestone
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
plutonic rocks, middle and lower Proterozoic (Proterozoic | Paleoproterozoic Mesoproterozoic) at surface, covers 0.2 % of this area
Middle and Lower Proterozoic plutonic rocks, undivided
Lithology: plutonic rock (phaneritic)
lower Proterozoic rocks, undivided (Proterozoic | Paleoproterozoic) at surface, covers < 0.1 % of this area
Lower Proterozoic rocks, undivided
Lithology: indeterminate
Moenkopi Formation (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area
Moenkopi Formation; Middle Triassic
Lithology: sandstone; mudstone; conglomerate
Carlile Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area
Carlile Shale; limited to northeastern area; Turonian-Coniacian
Lithology: shale; fine-grained mixed clastic; mixed clastic/carbonate
dune sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
dune sand sheet deposits
Lithology: sand; silt
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
Lithology: fine-grained mixed clastic; dolostone (dolomite); evaporite
Graneros Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area
Graneros Shale; limited to northeastern area; Cenomanian
Lithology: shale; fine-grained mixed clastic
Greenhorn Formation (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % 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
basaltic volcanics (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Basaltic volcanics; tuff rings, cinders, and proximal lavas
Lithology: basalt; pyroclastic
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, Morriso (Phanerozoic | Mesozoic | Jurassic Cretaceous) at surface, covers < 0.1 % of this area
Lithology: sandstone; mudstone; limestone
andesitic volcanics (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers < 0.1 % of this area
Andesitic volcanics
Lithology: andesite; intermediate volcanic rock
Ogallala Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene Miocene) at surface, covers < 0.1 % of this area
Ogallala Formation
Lithology: sand; silt; clay or mud; gravel; carbonate
Madera Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian) at surface, covers 0.3 % 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
Lithology: limestone; fine-grained mixed clastic
glacial deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Glacial deposits; till and outwash: upper and middle Pleistocene
Lithology: till; stratified glacial sediment
Quartermaster Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Quartermaster Formation; red sandstone and siltstone; Upper Permian
Lithology: sandstone; mudstone; evaporite
Bandelier Tuff (Phanerozoic | Cenozoic | Quaternary) at surface, covers 0.3 % of this area
Bandelier Tuff; Jemez Mountains area only
Lithology: rhyolite; tuff; pumice
metamorphic rocks, lower Proterozoic (Proterozoic | Paleoproterozoic) at surface, covers < 0.1 % of this area
Lower Proterozoic metamorphic rocks, undivided
Lithology: metamorphic rock
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
Garita Creek Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers 0.1 % of this area
Garita Creek Formation; Carnian
Lithology: mudstone; sandstone; conglomerate
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
Lithology: basalt; tuff; volcanic breccia (agglomerate); conglomerate
Kirtland and Fruitland Formations (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.9 % of this area
Kirtland and Fruitland Formations; coal-bearing, coal primarily in the Fruitland; Campanian to Maastrichtian
Lithology: sandstone; mudstone; coal
sand sheet deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
sand sheet deposits
Lithology: sand; silt
Modern alluvium (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Includes Piney Creek Alluvium and younger deposits
Lithology: alluvium
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
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)
Lithology: sandstone; shale; arenite; bentonite; claystone; mudstone; siltstone; andesite; coal; conglomerate; gypsum
Pictured Cliffs Sandstone and Lewis Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area
Lithology: sandstone; shale
Carlile Shale, Greenhorn Limestone, and Graneros Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area
Lithology: shale; limestone
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)
Lithology: conglomerate; sandstone; gravel; sand; gypsum; limestone; mudstone; siltstone
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
Trujillo Formation of Chinle Group (Phanerozoic | Mesozoic | Triassic) at surface, covers < 0.1 % of this area
Trujillo Formation; Norian
Lithology: coarse-grained mixed clastic; fine-grained mixed clastic; limestone
Capitan Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Capitan Formation; Upper Guadalupian age limestone (reef facies)
Lithology: carbonate
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
Lithology: felsic volcanic rock; alkalic volcanic rock; phonolite; trachyte; rhyolite
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
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
Poison Canyon Fm (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Arkosic conglomerate, sandstone, and shale
Lithology: sandstone; conglomerate; shale
caliche deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area
caliche deposits
Lithology: evaporite
Cretaceous rocks, undivided (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area
Cretaceous rocks, undivided
Lithology: clastic; volcanic rock (aphanitic); carbonate
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
Lithology: shale; fine-grained mixed clastic; limestone
Abo and Yeso Formations (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Abo and Yeso Formations, undivided
Lithology: sandstone; fine-grained mixed clastic; limestone; conglomerate
Fence Lake Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.2 % 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
Lithology: sandstone; conglomerate; coarse-grained mixed clastic; mixed clastic/volcanic; eolian; mixed clastic/carbonate
sand dune deposits (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
sand dune deposits
Lithology: sand; silt
Los Pinos Formation of Lower Santa Fe Group (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.3 % 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
Lithology: unconsolidated deposit; sand; gravel; basalt
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
Lithology: sandstone; shale; conglomerate; andesite; volcanic breccia (agglo
Salado Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Salado Formation; evaporite sequence; Upper Permian
Lithology: evaporite; sandstone
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
andesite flows (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area
Uppermost Cretaceous andesite flows; restricted to southwestern area
Lithology: andesite
Tecovas Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers < 0.1 % of this area
Tecovas Formation
Lithology: fine-grained mixed clastic; sandstone
Quaternary-Tertiary bolson deposits (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers < 0.1 % of this area
Quaternary-Tertiary bolson deposits
Lithology: clay or mud; silt; sandstone; conglomerate
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
Ojo Alamo Formation (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.2 % of this area
Ojo Alamo Formation; Paleocene, San Juan Basin
Lithology: sandstone; shale; conglomerate
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
Lithology: mixed clastic/volcanic; basalt
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.
Lithology: sand; siltstone; clay or mud; gravel; limestone; volcanic ash
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
Quatermaster and Rustler Formations (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Quartermaster and Rustler Formations; Upper Permian
Lithology: sandstone; mudstone; dolostone (dolomite); evaporite
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.
Lithology: shale; siltstone; conglomerate; sandstone; limestone
Mingus Formation (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian [Des Moines]) at surface, covers < 0.1 % of this area
Mingus Formation
Lithology: shale; sandstone; limestone; coal
alluvial fan deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area
alluvial fan deposits
Lithology: alluvial fan
Cliff House Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % of this area
Cliff House Sandstone; transgressive marine sandstone; Campanian
Lithology: sandstone; shale
Point Lookout Sandstone (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.3 % 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
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
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
Trujillo Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers < 0.1 % of this area
Trujillo Formation
Lithology: fine-grained mixed clastic; sandstone
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
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
Lithology: sand ; silt ; clay or mud; gravel; carbonate
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)
Lithology: dacite; rhyolite; andesite; basalt; porphyry; diorite; granite; granodiorite; latite; trachybasalt; trachyte; conglomerate; sandstone; sedimentary breccia; serpentinite
Quartzite, conglomerate, and interlayered mica schist (Proterozoic | Paleoproterozoic) at surface, covers < 0.1 % of this area
Quartzite, conglomerate, and interlayered mica schist
Lithology: quartzite; conglomerate; mica schist
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
Lithology: granite; granodiorite; quartz monzonite
sedimentary rocks of the Sacramento Mountains (Proterozoic | Mesoproterozoic) at surface, covers < 0.1 % of this area
Middle Proterozoic sedimentary rocks of the Sacramento Mountains
Lithology: metasedimentary rock
Victoria Peak Limestone (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Victorio Peak Limestone; in Brokeoff Mountains only
Lithology: limestone
disturbed ground (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area
disturbed ground, manmade
Lithology: indeterminate
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
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
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
Mulatto Tongue of Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers 0.2 % of this area
Mulatto Tongue of Mancos Shale
Lithology: shale; sandstone
Raton Formation (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers 0.5 % of this area
Raton Formation; in Raton Basin; unit contains conformable K/T boundary
Lithology: sandstone; mudstone; coal; conglomerate
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
Lithology: sandstone; shale; conglomerate; limestone; medium-grained mixed clastic
Cutoff Shale (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Cutoff Shale; in Brokeoff Mountains only
Lithology: shale
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
Lithology: coarse-grained mixed clastic; fine-grained mixed clastic; limestone
Chuska Sandstone (Phanerozoic | Cenozoic | Tertiary) at surface, covers 0.2 % of this area
Chuska Sandstone; restricted to Chuska Mountains
Lithology: sandstone
Chinle Formation (Phanerozoic | Mesozoic | Triassic-Late) at surface, covers < 0.1 % of this area
Chinle Formation
Lithology: fine-grained mixed clastic; sandstone
Castile Formation (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area
Castile Formation; dominantly anhydrite sequence; Upper Permian
Lithology: evaporite; limestone
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
Santa Fe Fm (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Siltstone, sandstone, and conglomerate
Lithology: siltstone; sandstone; conglomerate
Ash-flow tuff of main volcanic sequence (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area
Includes many named units
Lithology: ash-flow tuff
Hueco Limestone (Phanerozoic | Paleozoic | Permian [Wolfcamp]) at surface, covers < 0.1 % of this area
Hueco Limestone
Lithology: limestone; dolostone (dolomite); sandstone; shale; mudstone; conglomerate
Poison Canyon and Raton Fromations (Phanerozoic | Mesozoic Cenozoic | Cretaceous Tertiary) at surface, covers < 0.1 % of this area
Poison Canyon and Raton Formations; undivided
Lithology: sandstone; mudstone; coal; conglomerate
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
Pierre Shale, undivided (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area
Lithology: shale
bolson deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area
bolson deposits
Lithology: clay or mud; silt; sand; evaporite
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
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.
Lithology: shale; sandstone; conglomerate
Leona Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers < 0.1 % of this area
Leona Formation
Lithology: sand; gravel; clay or mud
Valles Rhyolite (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area
Valles Rhyolite; Jemez Mountains area only
Lithology: rhyolite; felsic volcanic rock
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
Lithology: biotite gneiss; schist; migmatite; quartzite; marble

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