| Playa—–Alluvium and evaporite deposits (Holocene) |
| Water—–Perenial standing water |
| Qa—–Alluvium (Holocene to upper Pleistocene) |
| Ql—–Landslide deposits and colluvium (Holocene to Pleistocene) — Landslide deposits on western flanks of Socorro Mountains not shown for clarity |
| Qpl—–Lacustrine and playa deposits (Holocene) — Includes associated alluvial and eolian deposits of major lake basins |
| Qp—–Piedmont alluvial deposits (Holocene to lower Pleistocene) |
| Qe—–Eolian deposits (Holocene to middle Pleistocene) |
| Qeg—–Gypsiferous eolian deposits (Holocene to middle Pleistocene) |
| Qep—–Eolian and piedmont deposits (Holocene to middle Pleistocene) — Interlayed eolian sands and piedmont-slope deposits |
| Qd—–Glacial deposits; till and outwash (upper to middle Pleistocene) |
| Qoa—–Older alluvial deposits of upland plains and piedmont areas, and calcic soils and eolian cover sediments of High Plains region (middle to lower Pleistocene) |
| Qb—–Basaltic to andesitic lava flows (Holocene to middle Pleistocene) |
| Qv—–Basaltic tephra and lavas near vents (upper to middle Pleistocene) — Tuff rings, maars, cinder cones, and minor proximal lavas. Includes maars at Kilbourne Hole and Zuni Salt Lake |
| Qbo—–Basaltic to andesitic lava flows (middle to lower Pleistocene) — Includes vent deposits |
| Qvr—–Ring-fracture rhyolite lava domes of the Valles caldera (uppermost to lower Pleistocene) |
| Qr—–Older rhyolite lavas and early volcaniclastic sedimentary fill deposits of the Valles caldera (lower Pleistocene) |
| Qbt—–Bandelier Tuff (lower Pleistocene) — Includes large blocks of older andesite in caldera-collapse breccia facies locally exposed on resurgent dome of the Valles caldera |
| QTt—–Travertine (Holocene to Pliocene) — Includes some pedogenic carbonate south of Sierra Ladrones |
| QTp—–Older piedmont alluvial deposits and shallow basin fill (middle Pleistocene to uppermost Pliocene) — Includes Quemado Formation and in northeast, high-level pediment gravels |
| QTs—–Upper Santa Fe Group (middle Pleistocene to uppermost Miocene) |
| QTsf—–Santa Fe Group, undivided (middle Pleistocene to uppermost Oligocene) — Basin fill of the Rio Grande rift |
| QTg—–Gila Group, Formation, or Conglomerate (middle Pleistocene to uppermost Oligocene?) — Includes Mimbres Formation and several informal units in southwestern basins |
| QTb—–Basaltic to andesitic lava flows (upper Pleistocene to lower Pliocene) — Includes minor vent deposits |
| Tus—–Upper Tertiary sedimentary units (Pliocene to upper Oligocene) |
| To—–Ogallala Formation (lower Pliocene to middle Miocene) — Alluvial and eolian deposits, and petrocalcic soils of the southern High Plains. Locally includes Qoa |
|
| Tfl—–Fence Lake Formation (Miocene) — Conglomerate and conglomeratic sandstone, coarse fluvial volcaniclastic sediments, minor eolian facies, and pedogenic carbonates of the southern Colorado Plateau region |
| Tsf—–Lower Santa Fe Group (upper Miocene to uppermost Oligocene) — Includes Hayner Ranch, Rincon Valley, Popotosa, Cochiti, Tesuque, Chamita, Abiquiu, Zia, and other formations |
| Tlp—–Los Pinos Formation of lower Santa Fe Group (Miocene and upper Oligocene) |
| Tc—–Chuska Sandstone (middle to upper Oligocene) — Restricted to Chuska Mountains |
| Tpb—–Basaltic to andesitic lava flows (Pliocene) — Includes minor vent deposits and small shield volcanoes. Flows are commonly interbedded in the Santa Fe and Gila Groups |
| Tmb—–Basaltic to andesitic lava flows (Miocene) — Includes minor vent deposits. Flows are commonly interbedded in the Santa Fe and Gila Groups |
| Tnb—–Basaltic to andesitic lava flows (Neogene) — Includes minor vent deposits. Flows are commonly interbedded in the Santa Fe and Gila Groups |
| Tnr—–Silicic to intermediate volcanic rocks (Neogene, mostly Miocene) — Rhyolite and dacite flows with associated minor tuffs. |
| Tnv—–Intermediate to silicic volcanic rocks (Neogene) — Mostly andesitic to dacitic stratovolcanoes. |
| Thb—–Hinsdale Basalt (Miocene and upper Oligocene) — Northern Taos and eastern Rio Arriba Counties; basalt flows interbedded with Los Pinos |
| Tuau—–Upper middle Tertiary basaltic andesites and andesites of the Mogollon Group (lower Miocene and uppermost Oligocene, 22–26 Ma) |
| Tual—–Lower-upper middle Tertiary basaltic andesites and andesites of the Mogollon Group (upper Oligocene, 26–29 Ma) |
| Tvs—–Middle Tertiary volcaniclastic sedimentary units (Oligocene to upper Eocene) — Mostly syneruptive volcaniclastic sedimentary aprons |
| Turf—–Upper middle Tertiary rhyolitic lavas and local tuffs (upper Oligocene, 24–29 Ma) |
| Tlrf—–Lower middle Tertiary rhyolitic lavas and local tuffs (lower Oligocene to upper Eocene, 36–31Ma) — Includes Mimbres Peak Formation, rhyolite of Cedar Hills, and other units in the Bootheel region |
| Turp—–Upper middle Tertiary rhyolitic pyroclastic rocks of the Mogollon Group, ash-flow tuffs (upper Oligocene, 24–30 Ma) |
| Tlrp—–Lower middle Tertiary rhyolitic to dacitic pyroclastic rocks of the Datil Group, ash-flow tuffs (lower Oligocene to upper Eocene, 31–36 Ma) |
| Tla—–Lower middle Tertiary andesitic to dacitic lavas and pyroclastic flow breccias (upper to middle Eocene, 33–43 Ma) |
| Tuv—–Upper middle Tertiary volcanic rocks (lower Miocene to upper Oligocene, younger than 30 Ma) — Mostly a combination of basaltic andesite lavas and rhyolitic ash-flow tuffs |
| Tlv—–Lower middle Tertiary volcanic rocks (lower Oligocene to upper Eocene, older than 31 Ma) — Mostly intermediate lavas of the lower Datil Group and intermediate volcaniclastic sediments of the lower Spears Group (Tla + Tvs) |
| Tv—–Middle Tertiary volcanic rocks, undifferentiated (lower Miocene to upper Eocene) |
| Ti—–Tertiary intrusive rocks of intermediate to silicic composition (Pliocene to Eocene) |
| Tim—–Tertiary mafic intrusive rocks (Pliocene to upper Eocene) |
| Tps—–Paleogene sedimentary units — Includes Baca, Galisteo, El Rito, Blanco Basin, Hart Mine, Love Ranch, Lobo, Sanders Canyon, Skunk Ranch, Timberlake, and Cub Mountain Formations |
| Tsj—–San Jose Formation (Eocene) — San Juan Basin |
| Tn—–Nacimiento Formation (Paleocene) — San Juan Basin |
| Toa—–Ojo Alamo Formation (Paleocene) — San Juan Basin |
| TKpc—–Poison Canyon Formation (Paleocene and Upper Cretaceous) — Proximal conglomerates and sandstones |
| TKr—–Raton Formation (Paleocene and Upper Cretaceous) — Distal sandstones, mudstones, and coal beds in eastern Raton Basin. Middle barren zone laterally equivalent to Poison Canyon Formation. |
| TKpr—–Poison Canyon and Raton Formations (Paleocene and Upper Cretaceous) — Broadly intertonguing conglomeratic sandstones, sandstones and mudstones; minor coal beds |
| TKa—–Animas Formation (Paleocene and Upper Cretaceous) — Volcaniclastic sedimentary rocks of intermediate composition in northern San Juan Basin |
| TKav—–Tertiary-Cretaceous andesitic to dacitic lavas and pyroclastic breccias (Paleocene and Upper Cretaceous) |
| TKi—–Tertiary-Cretaceous intrusive rocks (Paleocene and Upper Cretaceous |
| K—–Cretaceous rocks, undivided |
| Ku—–Upper Cretaceous rocks of southwestern New Mexico, undivided (Maastrichtian to Cenomanian for most part, although Beartooth and Sarten Formations are in part Albian) |
| Kmc—–McRae Formation (Maastrichtian) — Engle Basin — Cutter sag area |
| Kvt—–Vermejo Formation and Trinidad Sandstone (Maastrichtian to Campanian) |
| Kkf—–Kirtland and Fruitland Formations (Campanian) — Coal-bearing, primarily in the Fruitland |
| Kpc—–Pictured Cliffs Sandstone (Campanian) — Prominent, cliff-forming marine sandstone |
| Kls—–Lewis Shale — includes Mojado, U-Bar (Aptian), and Hell-to-Finish Formations, which are equivalent to Bisbee Group of Arizona |
| Kpn—–Pierre Shale and Niobrara Formation (Campanian to Coniacian) |
| Knf—–Fort Hays Limestone Member of Niobrara Formation (Coniacian to Turonian) |
| Kmv—–Mesaverde Group (Campanian to Turonian) — Includes Cliff House Sandstone, Menefee Formation and Point Lookout Sandstone. |
| Kch—–Cliff House Sandstone (Campanian) — Transgressive marine sandstone |
| Klv—–La Ventana Tongue of the Cliff House Sandstone (Turonian) |
| Kmf—–Menefee Formation (Campanian to Santonian) — Mudstone, shale, and sandstone; coal-bearing |
| Kpl—–Point Lookout Sandstone (Campanian to Santonian) — Regressive marine sandstone |
| Kms—–Satan Tongue of Mancos Shale (Santonian) |
| Kph—–Hosta Tongue of Point Lookout Sandstone (Santonian) — Transgressive marine sandstone |
| Kmm—–Mulatto Tongue of Mancos Shale (Santonian to Coniacian) |
| Kcc—–Crevasse Canyon Formation (Santonian to Coniacian) — Coal-bearing units are Dilco and Gibson Coal Members; other members are Bartlett Barren, Dalton Sandstone, and Borrego Pass Sandstone (or Lentil) |
| Kg—–Gallup Sandstone (Turonian) — Generally regressive marine sandstone |
| Kmr—–Rio Salado Tongue of the Mancos Shale (Turonian) |
| Kpg—–Pescado Tongue of the Mancos Shale and Gallup Sandstone (Turonian) — In Zuni Basin only; Pescado is chronostratigraphic equivalent of Juana Lopez Member of Mancos Shale |
| Kth—–Tres Hermanos Formation (Turonian) — Formerly designated as lower Gallup Sandstone in the Zuni Basin |
| Kma—–Moreno Hill Formation and Atarque Sandstone (Turonian) — In Salt Lake coal field and extreme southern Zuni Basin |
| Km—–Mancos Shale (Cenomanian to Campanian) — Divided into upper and lower parts by Gallup Sandstone |
| Kmu—–Mancos Shale, upper part (Campanian to Coniacian) |
| Kgm—–Gallup Sandstone and underlying D-Cross Tongue of the Mancos |
| Kml—–Mancos Shale, lower part (Turonian and Cenomanian) |
| Kdr—–Dakota Sandstone (Cenomanian) and Rio Salado Tongue of the Mancos Shale — In northwest Socorro County locally includes overlying Tres Hermanos Formation |
| Kgc—–Greenhorn Formation and Carlile Shale, undivided (Turonian to Cenomanian) — Locally includes Graneros Shale |
| Kc—–Carlile Shale (Turonian) — Limited to northeastern area |
| Kgg—–Greenhorn Formation and Graneros Shale (Turonian and Cenomanian) |
| Kgh—–Greenhorn Formation (Turonian to Cenomanian) |
| Kgr—–Graneros Shale (Cenomanian) — Limited to northeastern area |
| Kmd—–Intertongued Mancos Shale and Dakota Sandstone of west-central New Mexico (Cenomanian) |
| Kd—–Dakota Sandstone (Cenomanian) — Includes Oak Canyon, Cubero, and Paguate Tongues; includes Clay Mesa Tongue of Mancos Shale |
| Kdg—–Dakota Group: Upper and Lower Cretaceous rocks of east-central and northeast New Mexico |
| Kmb—–Mancos Shale (Cenomanian) and Beartooth and Sarten Formations (Albian) |
| Kl—–Lower Cretaceous rocks, undivided |
| J—–Upper and Middle Jurassic rocks, undivided — In southwest includes the basalt-bearing Broken Jug Formation |
| Jm—–Morrison Formation — Upper Jurassic nonmarine rocks |
| Jmsu—–Morrison Formation and upper San Rafael Group (lowermost Cretaceous? – upper Jurassic) |
| Jz—–Zuni Sandstone (Callovian) — Consists of undivided equivalents of the Summerville Formation and Bluff Sandstone; restricted to Zuni Basin area |
| Jze—–Zuni and Entrada Sandstones, undivided |
| Je—–Entrada Sandstone (Middle Jurassic) |
| Jsr—–San Rafael Group (Middle Jurassic) — Consists of Entrada Sandstone, Todilto and Summerville Formations, Bluff Sandstone, and locally Zuni Sandstone (or only Acoma Tongue of Zuni) |
| TR—–Triassic rocks, undivided — Continental red beds |
| TRrp—–Rock Point Formation of Chinle Group (Upper Triassic) — May locally include Wingate Sandstone (Triassic) |
| TRc—–Chinle Group (Upper Triassic) — Map unit includes Moenkopi Formation (Middle Triassic) at base in many areas |
| TRr—–Redonda Formation (Upper Triassic) |
| TRb—–Bull Canyon Formation (Norian) |
| TRt—–Trujillo Formation (Norian) |
| TRg—–Garita Creek Formation (Carnian) |
| TRs—–Santa Rosa Formation (Carnian) — Includes Moenkopi Formation (Middle Triassic) at base in most areas |
| TRcu—–Upper Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) |
| TRm—–Moenkopi Formation (Middle Triassic) |
| Pz—–Paleozoic rocks, undivided |
| P—–Permian rocks, undivided |
| Pqm—–Quartermaster Formation (Upper Permian) — Red sandstone and siltstone |
| Pqr—–Quartermaster and Rustler Formations (Upper Permian) |
| Pr—–Rustler Formation (Upper Permian) — Siltstone, gypsum, sandstone, and dolomite |
| Psl—–Salado Formation (Upper Permian) — Evaporite sequence, dominantly halite |
| Pc—–Castile Formation (Upper Permian) — Dominantly anhydrite sequence |
| Pat—–Artesia Group (Guadalupian) — Shelf facies forming broad south-southeast trending outcrop from Glorieta to Artesia area; includes Tansill, Yates, Seven Rivers, Queen and Grayburg Formations (Guadalupian) |
| Pty—–Sandstone, siltstone, limestone, dolomite, and anhydrite |
| Psr—–Seven Rivers Formation (Guadalupian) — Gypsum, anhydrite, salt, dolomite, and siltstone |
| Pqg—–Queen and Grayburg Formations (Guadalupian) — Sandstone, gypsum, anhydrite, dolomite, and red mudstone |
| Pcp—–Capitan Formation (Guadalupian) — Limestone (reef facies) |
| Pbc—–Bell Canyon Formation (Guadalupian) — Basin facies: sandstone, limestone, and shale |
| Pcc—–Cherry Canyon Formation (Guadalupian) — Basin facies: sandstone, limestone, and shale |
| Psa—–San Andres Formation (Guadalupian in south, in part Leonardian to north) — Limestone and dolomite with minor shale |
| Pg—–Glorieta Sandstone (Leonardian) — Texturally and mineralogically mature, high-silica quartz sandstone |
| Psg—–San Andres Limestone and Glorieta Sandstone (Guadalupian and Leonardian) |
| Pco—–Cutoff Shale (Leonardian) — In Brokeoff Mountains only |
| Pvp—–Victorio Peak Limestone (Leonardian) — In Brokeoff Mountains only |
| Py—–Yeso Formation (Leonardian) — Sandstones, siltstones, anhydrite, gypsum, halite, and dolomite |
| Pa—–Abo Formation (Wolfcampian) — Red beds, arkosic at base, finer and more mature above |
| Pau—–Upper part of Abo Formation (Wolfcampian) |
| Pal—–Lower part of Abo Formation (locally Virgilian to Upper Pennsylvanian) |
| Psy—–San Andres, Glorieta, and Yeso Formations, undivided |
| Pct—–Cutler Formation (Wolfcampian to Upper Pennsylvanian) — Used in northern areas and Chama embayment only |
| Ph—–Hueco Formation or Group (Wolfcampian) — Limestone |
| Pb—–Bursum Formation (lowermost Permian to uppermost Pennsylvanian) — Shale, arkose, and limestone |
| PIP—–Permian and Pennsylvanian rocks, undivided — Includes Concha, Scherrer, Colina, Epitaph, and Earp Formations (Permian) and Horquilla Limestone (Permian to Pennsylvanian) |
| PIPsc—–Sangre de Cristo Formation (Wolfcampian to Desmoinesian) |
| IP—–Pennsylvanian rocks undivided |
| IPm—–Madera Group (Pennsylvanian) |
| IPs—–Sandia Formation (Atokan) — Predominantly clastic unit (commonly arkosic) with minor black shales, and limestone in lower part |
| IPps—–Panther Seep Formation (VirgilianIn) — In Organ, Franklin, and San Andres Mountains |
| IPlc—–Lead Camp Formation (Atokan to Missourian) — Limestone |
| M—–Mississippian rocks, undivided — Arroyo Peñasco Group; Lake Valley Limestone in south-central New Mexico |
| MD—–Mississippian and Devonian rocks, undivided |
| MC—–Mississippian through Cambrian rocks, undivided |
| D—–Devonian rocks undivided — Includes Percha Shale, Oñate, and Sly Gap Formations |
| SO—–Silurian and Ordovician rocks, undivided |
| SOC—–Silurian through Cambrian rocks, undivided |
| OC—–Ordovician and Cambrian rocks, undivided — Includes Montoya Formation (or Group), El Paso Formation, and Bliss Sandstone |
| OCp—–Ordovician and Cambrian plutonic rocks of Florida Mountains |
| Ys—–Mesoproterozoic sedimentary rocks — Exposed in Sacramento Mountains, present in subsurface in southeastern New Mexico as De Baca Group |
| Yg—–Mesoproterozoic granitic plutonic rocks — Mainly 1.45–1.35 Ga
megacrystic granites, generally weakly foliated except locally at their
margins |
| YXp—–Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided |
| Xg—–Paleoproterozoic granitic plutonic rocks — Variably foliated granites and granitic gneisses; 1.71–1.65 Ga in northern New Mexico; 1.66–1.65 Ga in central and southern New Mexico |
| Xps—–Paleoproterozoic pelitic schist — Includes Rinconada Formation in northern New Mexico and Blue Springs Schist in Manzano Mountains |
| Xq—–Paleoproterozoic quartzite — Includes ~1.70 Ga Ortega Quartzite and equivalents in northern New Mexico and ~1.67 Ga quartzites in central New Mexico |
| Xs—–Paleoproterozoic metasedimentary rocks — Pelitic schist, quartz-muscovite schist, immature quartzite, and subordinate amphibolite |
| Xvf—–Paleoproterozoic metarhyolite and felsic volcanic schist — Includes 1.70 Ga Vadito Group in northern New Mexico and ~1.68 Ga Sevilleta Metarhyolite in central New Mexico |
| Xpc—–Paleoproterozoic calc-alkaline plutonic rocks — Granodiorite, diorite, and gabbro complexes; 1.78–1.71 Ga; interpreted to be intrusive part of juvenile volcanic arc basement |
| Xvm—–Paleoproterozoic mafic metavolcanic rocks with subordinate felsic metavolcanic rocks |
