Geologic units in Sandoval county, New Mexico

Additional scientific data in this geographic area

San Jose Formation (Eocene) at surface, covers 11 % of this area

San Juan Basin

Alluvium (Holocene to upper Pleistocene) at surface, covers 7 % of this area

Alluvium

Bandelier Tuff (Lower Pleistocene) at surface, covers 6 % of this area

Includes large blocks of older andesite in caldera-collapse breccia facies locally exposed on resurgent dome of the Valles caldera.

Nacimiento Formation (Paleocene) at surface, covers 6 % of this area

San Juan Basin

Upper Santa Fe Group (Middle Pleistocene to uppermost Miocene) at surface, covers 5 % of this area

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

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 5 % 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.

Mancos Shale, lower part (Turonian and Cenomanian) at surface, covers 4 % of this area

Mancos Shale, lower part

Lower Santa Fe Group (Upper Miocene to uppermost Oligocene) at surface, covers 4 % of this area

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

Santa Fe Group, undivided (Middle Pleistocene to uppermost Oligocene) at surface, covers 4 % 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.

Intermediate to silicic volcanic rocks (Neogene) at surface, covers 4 % of this area

Mostly andesitic to dacitic strato volcanoes. Includes rhyolite lavas and tuffs in the Jemez Mountains, Volcanoes in Jemez Mountains and eastern Colfax County are upper Miocene. Mount Taylor and composite volcanoes in the Taos Plateau volcanic field are Pliocene.

Basaltic to andesitic lava flows (Pliocene) at surface, covers 4 % of this area

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

Menefee Formation (Campanian to Santonian) at surface, covers 3 % of this area

Mudstone, shale, and sandstone; coal-bearing.

Lewis Shale (Campanian) at surface, covers 3 % of this area

Marine shale and mudstone.

Mancos Shale (Cenomanian to Campanian) at surface, covers 3 % of this area

Divided into Upper and Lower parts by Gallup Sandstone.

Mulatto Tongue of Mancos Shale (Santonian to Coniacian) at surface, covers 3 % of this area

Mulatto Tongue of Mancos Shale

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.

Morrison Formation (Upper Jurassic) at surface, covers 2 % of this area

Upper Jurassic nonmarine rocks.

Chinle Group (Upper to middle Triassic) at surface, covers 2 % 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.

Kirtland and Fruitland Formations (Campanian) at surface, covers 2 % of this area

Coal-bearing, primarily in the Fruitland.

Ring-fracture rhyolite lava domes of the Valles caldera (Uppermost to lower Pleistocene) at surface, covers 2 % of this area

Upper members of the Valles Rhyolite in Jemez Mountains. Includes 60-ka Banco Bonito and El Cajete Members on south margin of caldera.

Abo Formation (Wolfcampian) at surface, covers 2 % 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.

Mesoproterozoic granitic plutonic rocks (Mesoproterozoic) at surface, covers 1 % of this area

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

Dakota Sandstone (Cenomanian) at surface, covers 1 % of this area

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

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.

Ojo Alamo Formation (Paleocene) at surface, covers 1 % of this area

San Juan Basin

Satan Tongue of Mancos Shale (Santonian) at surface, covers 1 % of this area

Satan Tongue of Mancos Shale

Older rhyolite lavas and early volcaniclastic sedimentary fill deposits of the Valles caldera (Lower Pleistocene) at surface, covers 0.9 % of this area

Units are associated with resurgent doming or predate doming of the caldera core. Includes minor middle Pleistocene tuffs of the upper Valles Rhyolite on north side of caldera.

Cliff House Sandstone (Campanian) at surface, covers 0.9 % of this area

Transgressive marine sandstone.

Paleoproterozoic granitic plutonic rocks (Paleoproterozoic) at surface, covers 0.9 % 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.

Silicic to intermediate volcanic rocks (Neogene, mostly Miocene) at surface, covers 0.9 % 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.

Crevasse Canyon Formation (Santonian to Coniacian) at surface, covers 0.7 % 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).

Landslide deposits and colluvium (Holocene to Pleistocene) at surface, covers 0.7 % of this area

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

Gallup Sandstone (Turonian) at surface, covers 0.7 % of this area

Generally regressive marine sandstone.

Point Lookout Sandstone (Campanian to Santonian) at surface, covers 0.7 % of this area

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.

Permian rocks, undivided (Permian) at surface, covers 0.6 % of this area

Permian rocks, undivided

Hosta Tongue of Point Lookout Sandstone (Santonian) at surface, covers 0.5 % of this area

Transgressive marine sandstone.

Pictured Cliffs Sandstone (Campanian) at surface, covers 0.4 % of this area

Prominent cliff-forming marine sandstone.

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).

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

Continental red beds.

Paleogene sedimentary units (Paleogene) at surface, covers 0.3 % of this area

Includes Baca, Galisteo, El Rito, Blanco Basin, Hart Mine, Love Ranch, Lobo, Sanders Canyon, Skunk Ranch, Timberlake, and Cub Mountain Formations.

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

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

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.

Rio Salado Tongue of the Mancos Shale (Turonian) at surface, covers 0.2 % of this area

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.

Mesaverde Group (Campanian to Turonian) at surface, covers 0.2 % of this area

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

Paleoproterozoic calc-alkaline plutonic rocks (Paleoproterozoic) at surface, covers 0.2 % of this area

Granodiorite, diorite, and gabbro complexes; 1.78-1.71 Ga; interpreted to be intrusive part of juvenile volcanic arc basement.

San Andres Limestone and Glorieta Sandstone (Guadalupian and Leonardian) at surface, covers 0.2 % of this area

San Andres Limestone and Glorieta Sandstone

Paleoproterozoic metasedimentary rocks (Paleoproterozoic) at surface, covers 0.2 % 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 0.1 % 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.

Cutler Formation (Wolfcampian to Upper Pennsylvanian) at surface, covers < 0.1 % of this area

Used in northern areas and Chama embayment only.

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

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

Travertine (Holocene to Pliocene) at surface, covers < 0.1 % of this area

Includes some pedogenic carbonate south of Sierra Ladrones.

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

In Organ, Franklin, and San Andres Mountains.

Pennsylvanian rocks, undivided (Pennsylvanian) at surface, covers < 0.1 % 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.

La Ventana Tongue of the Cliff House Sandstone (Turonian) at surface, covers < 0.1 % of this area

La Ventana Tongue of the Cliff House Sandstone

Paleoproterozoic quartzite (Paleoproterozoic) at surface, covers < 0.1 % of this area

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

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.

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.

Paleoproterozoic rhyolite and felsic volcanic schist (Paleoproterozoic) at surface, covers < 0.1 % of this area

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

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.

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.

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.

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

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

Carlile Shale (Turonian) at surface, covers < 0.1 % of this area

Limited to northeastern area.