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.
Includes minor vent deposits and small shield volcanoes. Flows are commonly interbedded in the Santa Fe and Gila Groups.
Includes Concha, Scherrer, Colina, Epitaph, and Earp Formations (Permian) and Horquilla Limestone (Permian to Pennsylvanian).
Pierre Shale and Niobrara Formation
Alluvium
Limited to northeastern 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.
Includes vent deposits.
In southwest includes the basalt-bearing Broken Jug Formation.
Limited to northeastern area.
Includes 1.70 Ga Ortega Quartzite and equivalents in northern New Mexico and 1.67 Ga quartzites in central New Mexico.
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.
Landslide deposits on western flanks of Socorro Mountains not shown for clarity.
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.
In Sangre de Cristo Mountains.
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.
Flows south of Grants and west of Carrizozo are Holocene. Includes minor vent deposits.
Texturally and mineralogically mature, high-silica quartz sandstone.
Upper Chinle Group, Garita Creek through Redonda Formations, undivided
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.
Alluvial and eolian deposits, and petrocalcic soils of the southern High Plains. Locally includes Qoa.
Arroyo Penasco Group in Sangre de Cristo Mountains, Sierra Nacimiento, San Pedro Mountain, and Sandia Mountains; Lake Valley Limestone in south-central New Mexico.
Includes Moenkopi Formation (Middle Triassic) at base in most areas.
Includes Rinconada Formation in northern New Mexico and Blue Springs Schist in Manzano Mountains.
Eolian deposits.
Upper Jurassic nonmarine rocks.
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.
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.
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.
Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided
Includes minor vent deposits. Flows are commonly interbedded in the Santa Fe and Gila Groups.
Fort Hays Limestone Member of Niobrara Formation
Includes associated alluvial and eolian deposits of major lake basins.
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.
San Andres Limestone and Glorieta Sandstone
Includes 1.70 Ga Vadito Group in northern New Mexico and 1.68 Ga Sevilleta Metarhyolite in central New Mexico.
Granodiorite, diorite, and gabbro complexes; 1.78-1.71 Ga; interpreted to be intrusive part of juvenile volcanic arc basement.
Includes minor vent deposits. Flows are commonly interbedded in the Santa Fe and Gila Groups.
Glacial deposits; till and outwash.
Tuff rings, maars, cinder cones, and minor proximal lavas. Includes maars at Killbourne Hole and Zuni Salt Lake.
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.
Mainly 1.45 - 1.35 Ga megacrystic granites, generally weakly foliated except locally at their margins.