Geologic units in Valencia county, New Mexico

Additional scientific data in this geographic area

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 35 % of this area

Includes deposits of higher gradient tributaries bordering major stream valleys, alluvial veneers of the piedmont slope, and alluvial fans. May locally include uppermost Pliocene deposits.

Upper Santa Fe Group (Middle Pleistocene to uppermost Miocene) at surface, covers 21 % of this area

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

Alluvium (Holocene to upper Pleistocene) at surface, covers 16 % of this area

Alluvium

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

Eolian deposits.

Lower Santa Fe Group (Upper Miocene to uppermost Oligocene) at surface, covers 3 % of this area

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

Older alluvial deposits of upland plains and piedmont areas, and calcic soils and eolian cover sediments of High Plains region (Middle to lower Pleistocene) at surface, covers 2 % of this area

Includes scattered lacustrine, playa, and alluvial deposits of the Tahoka, Double Tanks, Tule, Blanco, Blackwater Draw, and Gatuna Formations, the latter of which may be Pliocene at base; outcrops, however, are basically of Quaternary deposits.

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

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

Madera Group (Pennsylvanian) at surface, covers 2 % of this area

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

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

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

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

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

Abo Formation (Wolfcampian) at surface, covers 1 % of this area

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

Landslide deposits and colluvium (Holocene to Pleistocene) at surface, covers 1 % of this area

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

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

Permian rocks, undivided

Bursum Formation (Lowermost Permian to uppermost Pennsylvanian) at surface, covers 0.8 % of this area

Shale, arkose, and limestone.

San Andres Formation (Guadalupian and Leonardian) at surface, covers 0.8 % of this area

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

Travertine (Holocene to Pliocene) at surface, covers 0.7 % of this area

Includes some pedogenic carbonate south of Sierra Ladrones.

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

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

Santa Fe Group, undivided (Middle Pleistocene to uppermost Oligocene) at surface, covers 0.5 % of this area

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

Paleoproterozoic rhyolite and felsic volcanic schist (Paleoproterozoic) at surface, covers 0.5 % of this area

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

Paleoproterozoic quartzite (Paleoproterozoic) at surface, covers 0.4 % of this area

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

San Andres Limestone and Glorieta Sandstone (Guadalupian and Leonardian) at surface, covers 0.4 % of this area

San Andres Limestone and Glorieta Sandstone

Paleoproterozoic pelitic schist (Paleoproterozoic) at surface, covers 0.4 % of this area

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

Mancos Shale, lower part (Turonian and Cenomanian) at surface, covers 0.3 % of this area

Mancos Shale, lower part

Mesaverde Group (Campanian to Turonian) at surface, covers 0.3 % of this area

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

Paleoproterozoic metasedimentary rocks (Paleoproterozoic) at surface, covers 0.3 % of this area

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

Middle Tertiary volcaniclastic sedimentary units (Oligocene to upper Eocene) at surface, covers 0.3 % of this area

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

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

In southwest includes the basalt-bearing Broken Jug Formation.

Chinle Group (Upper to middle Triassic) at surface, covers 0.3 % of this area

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

Intertongued Mancos Shale and Dakota Sandstone of west-central New Mexico (Cenomanian) at surface, covers 0.3 % of this area

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

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

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

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

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

San Rafael Group (Middle Jurassic) at surface, covers 0.1 % of this area

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

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

Includes minor vent deposits.

Glorieta Sandstone (Leonardian) at surface, covers < 0.1 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

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

In Organ, Franklin, and San Andres Mountains.

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

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

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

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

Basaltic to andesitic lava flows (Neogene) at surface, covers < 0.1 % of this area

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

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

Continental red beds.

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

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

Tertiary intrusive rocks of intermediate to silicic composition (Pliocene to Eocene) at surface, covers < 0.1 % of this area

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