Geologic units in Bernalillo county, New Mexico

Additional scientific data in this geographic area

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 19 % 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.

Madera Group (Pennsylvanian) at surface, covers 17 % 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.

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

Alluvium

Upper Santa Fe Group (Middle Pleistocene to uppermost Miocene) at surface, covers 15 % of this area

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

Crevasse Canyon Formation (Santonian to Coniacian) at surface, covers 6 % of this area

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

Eolian deposits (Holocene to middle Pleistocene) at surface, covers 5 % of this area

Eolian deposits.

Mesoproterozoic granitic plutonic rocks (Mesoproterozoic) at surface, covers 3 % of this area

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

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.

Lower Santa Fe Group (Upper Miocene to uppermost Oligocene) at surface, covers 2 % 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.

Santa Fe Group, undivided (Middle Pleistocene to uppermost Oligocene) at surface, covers 2 % of this area

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

Intertongued Mancos Shale and Dakota Sandstone of west-central New Mexico (Cenomanian) at surface, covers 1 % of this area

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

Mesaverde Group (Campanian to Turonian) at surface, covers 1 % of this area

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

Paleoproterozoic mafic metavolcanic rocks with subordinate felsic metavolcanic rocks (Paleoproterozoic) at surface, covers 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.

Panther Seep Formation (Virgilian) at surface, covers 0.9 % of this area

In Organ, Franklin, and San Andres Mountains.

Abo Formation (Wolfcampian) at surface, covers 0.8 % 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.

Mancos Shale, lower part (Turonian and Cenomanian) at surface, covers 0.6 % of this area

Mancos Shale, lower part

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

Upper Jurassic nonmarine rocks.

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

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

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

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

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

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

Yeso Formation (Leonardian) at surface, covers 0.3 % of this area

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

San Andres Limestone and Glorieta Sandstone (Guadalupian and Leonardian) at surface, covers 0.3 % of this area

San Andres Limestone and Glorieta Sandstone

Triassic rocks, undivided (Triassic) at surface, covers 0.3 % of this area

Continental red beds.

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

Generally regressive marine sandstone.

Paleoproterozoic rhyolite and felsic volcanic schist (Paleoproterozoic) at surface, covers 0.2 % of this area

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

Basaltic to andesitic lava flows (Upper Pleistocene to lower Pliocene) at surface, covers 0.2 % of this area

Includes minor vent deposits.

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

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

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

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

Pennsylvanian rocks, undivided (Pennsylvanian) at surface, covers 0.2 % of this area

In Sangre de Cristo Mountains may include Sandia, Madera, La Pasada, Alamitos, and Flechado Formations; elsewhere may include Bar-B, Nakaye, Red House, Oswaldo, and Syrena Formations.

Upper and Middle Jurassic rocks, undivided (Upper and Middle Jurassic) at surface, covers 0.1 % of this area

In southwest includes the basalt-bearing Broken Jug Formation.

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

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

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.

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

Transgressive marine sandstone.

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.

Silicic to intermediate volcanic rocks (Neogene, mostly Miocene) at surface, covers < 0.1 % of this area

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

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.

Chinle Group (Upper to middle Triassic) at surface, covers < 0.1 % 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.