Geologic units in Mora county, New Mexico

Additional scientific data in this geographic area

Upper and lower Cretaceous rocks of east-central and northeast New Mexico (Cenomanian and Albian) at surface, covers 22 % 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.

Basaltic to andesitic lava flows (Pliocene) at surface, covers 16 % of this area

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

Permian and Pennsylvanian rocks, undivided (Permian and Pennsylvanian) at surface, covers 12 % of this area

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

Pierre Shale and Niobrara Formation (Campanian to Coniacian) at surface, covers 7 % of this area

Pierre Shale and Niobrara Formation

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

Alluvium

Graneros Shale (Cenomanian) at surface, covers 6 % of this area

Limited to northeastern area.

Greenhorn Formation (Turonian to Cenomanian) at surface, covers 3 % 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.

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

Includes vent deposits.

Upper and Middle Jurassic rocks, undivided (Upper and Middle Jurassic) at surface, covers 2 % of this area

In southwest includes the basalt-bearing Broken Jug Formation.

Carlile Shale (Turonian) at surface, covers 2 % of this area

Limited to northeastern area.

Paleoproterozoic quartzite (Paleoproterozoic) at surface, covers 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.

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.

Landslide deposits and colluvium (Holocene to Pleistocene) at surface, covers 2 % of this area

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

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

Sangre de Cristo Formation (Wolfcampian to Desmoinesian) at surface, covers 1 % of this area

In Sangre de Cristo Mountains.

Paleoproterozoic metasedimentary rocks (Paleoproterozoic) at surface, covers 1 % 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.

Basaltic to andesitic lava flows (Holocene to middle Pleistocene) at surface, covers 1 % of this area

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

Glorieta Sandstone (Leonardian) at surface, covers 0.9 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

Upper Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) at surface, covers 0.9 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

Upper Tertiary sedimentary units (Pliocene to upper Oligocene) at surface, covers 0.9 % 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.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 0.9 % of this area

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

Mississippian rocks, undivided (Mississippian) at surface, covers 0.9 % 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.

Santa Rosa Formation (Carnian) at surface, covers 0.8 % of this area

Includes Moenkopi Formation (Middle Triassic) at base in most areas.

Paleoproterozoic pelitic schist (Paleoproterozoic) at surface, covers 0.4 % of this area

Includes Rinconada Formation in northern New Mexico and Blue Springs Schist in Manzano Mountains.

Eolian deposits (Holocene to middle Pleistocene) at surface, covers 0.4 % of this area

Eolian deposits.

Morrison Formation (Upper Jurassic) at surface, covers 0.4 % of this area

Upper Jurassic nonmarine rocks.

Chinle Group (Upper to middle Triassic) at surface, covers 0.4 % 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.

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 0.4 % 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.

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 0.4 % 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.

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided (Mesoproterozoic and Paleoproterozoic) at surface, covers 0.4 % of this area

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided

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

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

Fort Hays Limestone Member of Niobrara Formation (Coniacian to Turonian) at surface, covers 0.2 % of this area

Fort Hays Limestone Member of Niobrara Formation

Lacustrine and playa-lake deposits (Holocene) at surface, covers 0.2 % of this area

Includes associated alluvial and eolian deposits of major lake basins.

Paleoproterozoic mafic metavolcanic rocks with subordinate felsic metavolcanic rocks (Paleoproterozoic) at surface, covers 0.2 % 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.

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

San Andres Limestone and Glorieta Sandstone

Paleoproterozoic rhyolite and felsic volcanic schist (Paleoproterozoic) at surface, covers 0.2 % of this area

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

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.

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.

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

Glacial deposits; till and outwash.

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.

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.

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.