Geologic units in Cibola county, New Mexico

Additional scientific data in this geographic area

Basaltic to andesitic lava flows (Middle to lower Pleistocene) at surface, covers 15 % of this area

Includes vent deposits.

Chinle Group (Upper to middle Triassic) at surface, covers 10 % 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 9 % of this area

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

Alluvium (Holocene to upper Pleistocene) at surface, covers 8 % of this area

Alluvium

Basaltic to andesitic lava flows (Holocene to middle Pleistocene) at surface, covers 6 % of this area

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

Landslide deposits and colluvium (Holocene to Pleistocene) at surface, covers 5 % of this area

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

San Andres Formation (Guadalupian and Leonardian) at surface, covers 4 % of this area

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

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.

San Rafael Group (Middle Jurassic) at surface, covers 4 % of this area

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

Rio Salado Tongue of the Mancos Shale (Turonian) at surface, covers 3 % 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.

Tres Hermanos Formation (Turonian) at surface, covers 3 % of this area

Formerly designated as Lower Gallup Sandstone in the Zuni Basin.

Moreno Hill Formation and Atarque Sandstone (Turonian) at surface, covers 3 % of this area

In Salt Lake coal field and extreme southern Zuni basin.

Crevasse Canyon Formation (Santonian to Coniacian) at surface, covers 3 % 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).

Dakota Sandstone (Cenomanian) at surface, covers 3 % 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 2 % of this area

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

Glorieta Sandstone (Leonardian) at surface, covers 2 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

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.

Intermediate to silicic volcanic rocks (Neogene) at surface, covers 2 % 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.

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

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

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

Gallup Sandstone and underlying D-Cross Tongue of the Mancos Shale (Turonian) at surface, covers 1 % of this area

Gallup Sandstone and underlying D-Cross Tongue of the Mancos Shale

Pescado Tongue of the Mancos Shale and Gallup Sandstone (Turonian) at surface, covers 1 % of this area

In Zuni Basin only; Pescado is chrono-stratigraphic equivalent of Juana Lopez Member of Mancos Shale.

Upper Tertiary sedimentary units (Pliocene to upper Oligocene) at surface, covers 1 % of this area

Includes Bidahochi Formation (Pliocene to upper Miocene), Picuris Formation (Miocene to Oligocene), Las Feveras Formation (Pliocene), lower Gila Group units in the southwest, and unnamed Pliocene unit in northwestern Socorro County.

Morrison Formation (Upper Jurassic) at surface, covers 1 % of this area

Upper Jurassic nonmarine rocks.

Fence Lake Formation (Miocene) at surface, covers 1 % of this area

Conglomerate and conglomeratic sandstone, coarse fluvial volcaniclastic sediments, minor eolian facies, and pedogenic carbonates of the southern Colorado Plateau region.

Paleoproterozoic rhyolite and felsic volcanic schist (Paleoproterozoic) at surface, covers 0.6 % of this area

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

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

Mancos Shale, lower part

Zuni and Entrada Sandstones, undivided (Middle Jurassic) at surface, covers 0.5 % of this area

Zuni and Entrada Sandstones, undivided

Mulatto Tongue of Mancos Shale (Santonian to Coniacian) at surface, covers 0.4 % of this area

Mulatto Tongue of Mancos Shale

Gallup Sandstone (Turonian) at surface, covers 0.3 % of this area

Generally regressive marine sandstone.

Menefee Formation (Campanian to Santonian) at surface, covers 0.3 % of this area

Mudstone, shale, and sandstone; coal-bearing.

Zuni Sandstone (Callovian) at surface, covers 0.2 % of this area

Consists of undivided equivalents of the Summerville Formation and Bluff Sandstone; restricted to Zuni Basin area.

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

Permian rocks, undivided

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.

Point Lookout Sandstone (Campanian to Santonian) at surface, covers 0.1 % 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.

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

Includes some pedogenic carbonate south of Sierra Ladrones.

Entrada Sandstone (Middle Jurassic) at surface, covers < 0.1 % of this area

Entrada Sandstone

Madera Group (Pennsylvanian) at surface, covers < 0.1 % 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 (Miocene) at surface, covers < 0.1 % of this area

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

Paleoproterozoic calc-alkaline plutonic rocks (Paleoproterozoic) at surface, covers < 0.1 % of this area

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

Eolian deposits (Holocene to middle Pleistocene) at surface, covers < 0.1 % of this area

Eolian deposits.

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 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.

Satan Tongue of Mancos Shale (Santonian) at surface, covers < 0.1 % of this area

Satan Tongue of Mancos Shale

Rock Point Formation of Chinle Group (Upper Triassic) at surface, covers < 0.1 % of this area

May locally include Wingate Sandstone.

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

Transgressive marine sandstone.

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.

Mancos Shale (Cenomanian to Campanian) at surface, covers < 0.1 % of this area

Divided into Upper and Lower parts by Gallup Sandstone.

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

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

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.

Paleogene sedimentary units (Paleogene) at surface, covers < 0.1 % of this area

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

Mesaverde Group (Campanian to Turonian) at surface, covers < 0.1 % of this area

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

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)

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)