Geologic units in Colfax county, New Mexico

Additional scientific data in this geographic area

Pierre Shale and Niobrara Formation (Campanian to Coniacian) at surface, covers 24 % of this area

Pierre Shale and Niobrara Formation

Raton Formation (Paleocene and upper Cretaceous) at surface, covers 11 % of this area

Distal sandstones, mudstones, and coal beds in eastern Raton Basin. Middle barren zone laterally equivalent to Poison Canyon Formation. K/T boundary discontinuously exposed about 100 m above basal conglomerate in area southwest of Raton.

Poison Canyon Formation (Paleocene and upper Cretaceous) at surface, covers 9 % of this area

Proximal conglomerates and sandstones in western Raton Basin; generally lacking coal beds. Cretaceous beds mostly restricted to subsurface.

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

Alluvium

Landslide deposits and colluvium (Holocene to Pleistocene) at surface, covers 6 % of this area

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

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 5 % of this area

Alluvial and eolian deposits, and petrocalcic soils of the southern High Plains. Locally includes Qoa.

Basaltic to andesitic lava flows (Pliocene) at surface, covers 5 % of this area

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

Poison Canyon and Raton Formations (Paleocene and upper Cretaceous) at surface, covers 4 % of this area

Broadly intertonguing conglomeratic sandstones, sandstones and mudstones; minor coal beds.

Basaltic to andesitic lava flows (Miocene) at surface, covers 3 % of this area

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

Upper and lower Cretaceous rocks of east-central and northeast New Mexico (Cenomanian and Albian) at surface, covers 3 % 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.

Carlile Shale (Turonian) at surface, covers 3 % of this area

Limited to northeastern area.

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.

Paleoproterozoic granitic plutonic rocks (Paleoproterozoic) at surface, covers 2 % 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.

Greenhorn Formation (Turonian to Cenomanian) at surface, covers 2 % of this area

Limited to northeastern area; the upper member (Bridge Creek Limestone) can be traced into western area where it is commonly shown as a bed-rank unit in Mancos Shale on detailed maps.

Eolian deposits (Holocene to middle Pleistocene) at surface, covers 2 % of this area

Eolian deposits.

Fort Hays Limestone Member of Niobrara Formation (Coniacian to Turonian) at surface, covers 2 % of this area

Fort Hays Limestone Member of Niobrara Formation

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

Includes vent deposits.

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).

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 1 % 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.

Vermejo Formation and Trinidad Sandstone (Maastrichtian to Campanian) at surface, covers 1 % of this area

Vermejo Formation and Trinidad Sandstone

Basaltic to andesitic lava flows (Neogene) at surface, covers 0.9 % of this area

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

Graneros Shale (Cenomanian) at surface, covers 0.7 % of this area

Limited to northeastern area.

Sangre de Cristo Formation (Wolfcampian to Desmoinesian) at surface, covers 0.6 % of this area

In Sangre de Cristo Mountains.

Pennsylvanian rocks, undivided (Pennsylvanian) at surface, covers 0.3 % 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.

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.

Greenhorn Formation and Carlile Shale, undivided (Turonian to Cenomanian) at surface, covers 0.3 % of this area

Locally includes Graneros Shale.

Basaltic to andesitic lava flows (Holocene to middle Pleistocene) at surface, covers 0.3 % of this area

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

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.

Upper and Middle Jurassic rocks, undivided (Upper and Middle Jurassic) at surface, covers 0.2 % of this area

In southwest includes the basalt-bearing Broken Jug Formation.

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.

Greenhorn Formation and Graneros Shale (Turonian and Cenomanian) at surface, covers 0.2 % of this area

Limited to northeastern area.

Intermediate to silicic volcanic rocks (Neogene) at surface, covers 0.2 % 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.

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.

Lower middle Tertiary andesitic to dacitic lavas and pyroclastic flow breccias (Upper to middle Eocene (33-43 Ma)) at surface, covers 0.1 % of this area

Includes Rubio Peak Formation, Orejon Andesite, andesite of Dry Leggett Canyon, andesite of Telephone Canyon, and other units in southwestern, central, and northern New Mexico. Locally includes minor mafic lavas. Ancient landslide blocks of Mader Limestone, as much as one mile long, occur within Rubio Peak lavas in the central Black Range, west of Winston.

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.

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.

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.

Older piedmont alluvial deposits and shallow basin fill (Middle Pleistocene to uppermost Pliocene) at surface, covers < 0.1 % of this area

Includes Quemado Formation and in northeast, high-level pediment gravels.

Upper middle Tertiary rhyolitic pyroclastic rocks of the Mogollon Group, ash-flow tuffs (Upper Oligocene (24-30 Ma)) at surface, covers < 0.1 % of this area

Regional ash-flow tuffs include the La Jencia, Vick's Peak, Lemitar, South Canyon, Bloodgood Canyon, Shelley Peak, Davis Canyon, Park, Rhyolite Canyon, Apache Springs, and Amalia Tuffs; the tuffs of Horseshoe Canyon, Diamond Creek, Garcia Camp, Caronita Canyon, Turkey Springs, and Little Mineral Creek; and the Jordan Canyon Formation. Includes some locally erupted lavas and tuffs within thick intra-caldera units; includes minor volcaniclastic sedimentary units between thin outflow sheets.

Morrison Formation (Upper Jurassic) at surface, covers < 0.1 % of this area

Upper Jurassic nonmarine rocks.

Basaltic tephra and lavas near vents (Upper to middle Pleistocene) at surface, covers < 0.1 % of this area

Tuff rings, maars, cinder cones, and minor proximal lavas. Includes maars at Killbourne Hole and Zuni Salt Lake.

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 Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) at surface, covers < 0.1 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

Santa Fe Group, undivided (Middle Pleistocene to uppermost Oligocene) at surface, covers < 0.1 % 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.

Lower-upper middle Tertiary basaltic andesites and andesites of the Mogollon Group (Upper Oligocene (26-29 Ma)) at surface, covers < 0.1 % of this area

Includes La Jara Peak Basaltic Andesite, Uvas Basaltic Andesite, basaltic andesites of Poverty Creek and Twin Peaks, Squirrel Springs Canyon Andesite, Razorback Basalt, Bear Springs Basalt, flows of Gila Flat, Salt Creek Formation, Middle Mountain Formation, and the Alum Mountain Group. Pre-Amalia-Tuff lavas in the Questa caldera are dominantly silicic andesites and dacites; elsewhere silicic lavas are a minor component of Tual.

Lower Santa Fe Group (Upper Miocene to uppermost Oligocene) at surface, covers < 0.1 % of this area

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

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.

Upper Tertiary sedimentary units (Pliocene to upper Oligocene) at surface, covers < 0.1 % 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.

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

Texturally and mineralogically mature, high-silica quartz sandstone.

Niobrara Fm (Cretaceous) at surface, covers < 0.1 % of this area

Calcareous shale and limestone

Raton Fm (Tertiary-Cretaceous) at surface, covers < 0.1 % of this area

Arkosic sandstone, siltstone, and shale; contains major coal deposits in Raton Basin

Middle Tertiary volcanic rocks, undifferentiated (Lower Miocene to upper Eocene) at surface, covers < 0.1 % of this area

Includes the predominantly andesitic to dacitic stratovolcano complex at Sierra Blanca (Oligocene to upper Eocene) and many smaller outliers.

Poison Canyon Fm (Tertiary) at surface, covers < 0.1 % of this area

Arkosic conglomerate, sandstone, and shale

Basalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite (Tertiary) at surface, covers < 0.1 % of this area

Includes basalts of Hinsdale Fm in San Juan Mountains - Servilleta Fm in San Luis Valley and many other occurrences

Pierre Shale, undivided (Cretaceous) at surface, covers < 0.1 % of this area

Pierre Shale, undivided

Carlile Shale, Greenhorn Limestone, and Graneros Shale (Cretaceous) at surface, covers < 0.1 % of this area

Carlile Shale, Greenhorn Limestone, and Graneros Shale

Pierre Shale (Kp), Niobrara (Kn), and Carlile, Greenhorn, and Graneros (Kcg) Fms, undivided (Cretaceous) at surface, covers < 0.1 % of this area

Pierre Shale (Kp), Niobrara (Kn), and Carlile, Greenhorn, and Graneros (Kcg) Fms, undivided

South Park Fm (Tertiary) at surface, covers < 0.1 % of this area

Arkosic sandstone and shale, volcaniclastic conglomerate, and andesite flows and breccia

Vermejo Fm and Trinidad Sandstone (Cretaceous) at surface, covers < 0.1 % of this area

Shale, sandstone, and major coal beds; sandstone

Dakota, Purgatoire, Morrison, Ralston Creek, and Entrada Fms in southeast. Dakota, Morrison, and Entrada Fms in central mountains. Dakota, Burro Canyon, Morrison, Wanakah, and Entrada Fms in Gunnison River area. Dakota, Morrison, Curtis, And Entrada Fm (Cretaceous-Jurassic) at surface, covers < 0.1 % of this area

Dakota, Purgatoire, Morrison, Ralston Creek, and Entrada Fms in southeast. Dakota, Morrison, and Entrada Fms in central mountains. Dakota, Burro Canyon, Morrison, Wanakah, and Entrada Fms in Gunnison River area. Dakota, Morrison, Curtis, And Entrada Fm

Sangre de Cristo Fm (Permian-Pennsylvanian) at surface, covers < 0.1 % of this area

Arkosic conglomerate, sandstone, and siltstone