Geologic units in Santa Fe county, New Mexico

Additional scientific data in this geographic area

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 15 % 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 13 % of this area

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

Chinle Group (Upper to middle Triassic) at surface, covers 12 % 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.

Lower Santa Fe Group (Upper Miocene to uppermost Oligocene) at surface, covers 12 % of this area

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

Basaltic to andesitic lava flows (Pliocene) at surface, covers 7 % of this area

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

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided (Mesoproterozoic and Paleoproterozoic) at surface, covers 6 % of this area

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided

Alluvium (Holocene to upper Pleistocene) at surface, covers 6 % of this area

Alluvium

Paleoproterozoic metasedimentary rocks (Paleoproterozoic) at surface, covers 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.

Paleoproterozoic granitic plutonic rocks (Paleoproterozoic) at surface, covers 4 % 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.

Mancos Shale (Cenomanian to Campanian) at surface, covers 4 % of this area

Divided into Upper and Lower parts by Gallup Sandstone.

San Andres Formation (Guadalupian and Leonardian) at surface, covers 3 % of this area

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

Paleogene sedimentary units (Paleogene) at surface, covers 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.

Permian and Pennsylvanian rocks, undivided (Permian and Pennsylvanian) at surface, covers 2 % of this area

Includes Concha, Scherrer, Colina, Epitaph, and Earp Formations (Permian) and Horquilla Limestone (Permian to Pennsylvanian).

Tertiary intrusive rocks of intermediate to silicic composition (Pliocene to Eocene) at surface, covers 2 % 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.

Bandelier Tuff (Lower Pleistocene) at surface, covers 0.9 % of this area

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

Mesaverde Group (Campanian to Turonian) at surface, covers 0.8 % of this area

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

Middle Tertiary volcaniclastic sedimentary units (Oligocene to upper Eocene) at surface, covers 0.8 % 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.

Madera Group (Pennsylvanian) at surface, covers 0.8 % 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.

Glorieta Sandstone (Leonardian) at surface, covers 0.6 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

Yeso Formation (Leonardian) at surface, covers 0.6 % of this area

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

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

Upper Jurassic nonmarine rocks.

Upper and lower Cretaceous rocks of east-central and northeast New Mexico (Cenomanian and Albian) at surface, covers 0.5 % of this area

Consists of Dakota Group, which includes Romeroville Sandstone (Cenomanian), Pajarito Shale, and Mesa Rica Sandstone (Albian); the underlying Tucumcari Shale (Albian) in Tucumcari area and Glencairn Formation (Albian) in Union County.

Redonda Formation (Upper Triassic) at surface, covers 0.3 % of this area

Redonda Formation

Artesia Group (Guadalupian) at surface, covers 0.3 % of this area

Shelf facies forming broad south-southeast trending outcrop from Glorieta to Artesia area; includes Tansill, Yates, Seven Rivers, Queen and Grayburg Formations (Guadalupian). May locally include Moenkopi Formation (Triassic) at top.

Abo Formation (Wolfcampian) at surface, covers 0.2 % 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.

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

Permian rocks, undivided

Dakota Sandstone (Cenomanian) at surface, covers 0.2 % of this area

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

San Rafael Group (Middle Jurassic) at surface, covers 0.2 % of this area

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

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.

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.

Landslide deposits and colluvium (Holocene to Pleistocene) at surface, covers 0.1 % of this area

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

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 0.1 % 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.

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.

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

Continental red beds.

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.

Lacustrine and playa-lake deposits (Holocene) at surface, covers < 0.1 % of this area

Includes associated alluvial and eolian deposits of major lake basins.

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

In Organ, Franklin, and San Andres Mountains.

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.

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.

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.