Geologic units in Torrance county, New Mexico

Additional scientific data in this geographic area

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 21 % 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.

Lacustrine and playa-lake deposits (Holocene) at surface, covers 14 % of this area

Includes associated alluvial and eolian deposits of major lake basins.

Yeso Formation (Leonardian) at surface, covers 13 % of this area

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

Alluvium (Holocene to upper Pleistocene) at surface, covers 12 % of this area

Alluvium

San Andres Formation (Guadalupian and Leonardian) at surface, covers 12 % of this area

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

Glorieta Sandstone (Leonardian) at surface, covers 8 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 6 % of this area

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

Madera Group (Pennsylvanian) at surface, covers 5 % 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.

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

Eolian deposits.

Abo Formation (Wolfcampian) at surface, covers 1.0 % 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.

Santa Rosa Formation (Carnian) at surface, covers 0.9 % of this area

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

Paleoproterozoic granitic plutonic rocks (Paleoproterozoic) at surface, covers 0.8 % 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.

Paleoproterozoic metasedimentary rocks (Paleoproterozoic) at surface, covers 0.6 % 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 quartzite (Paleoproterozoic) at surface, covers 0.6 % of this area

Includes 1.70 Ga Ortega Quartzite and equivalents in northern New Mexico and 1.67 Ga quartzites in central New Mexico.

Playa (Quaternary) at surface, covers 0.5 % of this area

Playa

Paleoproterozoic pelitic schist (Paleoproterozoic) at surface, covers 0.3 % of this area

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

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.

Mesoproterozoic granitic plutonic rocks (Mesoproterozoic) at surface, covers 0.2 % of this area

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

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.

Chinle Group (Upper to middle Triassic) at surface, covers 0.2 % 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.

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

In Organ, Franklin, and San Andres Mountains.

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.

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.

San Andres Limestone and Glorieta Sandstone (Guadalupian and Leonardian) at surface, covers 0.1 % of this area

San Andres Limestone and Glorieta Sandstone

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

Permian rocks, undivided

Bursum Formation (Lowermost Permian to uppermost Pennsylvanian) at surface, covers 0.1 % of this area

Shale, arkose, and limestone.

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.

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.

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 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