Geologic units in San Miguel county, New Mexico

Additional scientific data in this geographic area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided (Upper Triassic) at surface, covers 21 % of this area

Upper Chinle Group, Garita Creek through Redonda Formations, undivided

Upper and lower Cretaceous rocks of east-central and northeast New Mexico (Cenomanian and Albian) at surface, covers 17 % 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.

Santa Rosa Formation (Carnian) at surface, covers 12 % of this area

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

Glorieta Sandstone (Leonardian) at surface, covers 6 % of this area

Texturally and mineralogically mature, high-silica quartz sandstone.

Pennsylvanian rocks, undivided (Pennsylvanian) at surface, covers 5 % 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.

Permian and Pennsylvanian rocks, undivided (Permian and Pennsylvanian) at surface, covers 5 % of this area

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

Upper and Middle Jurassic rocks, undivided (Upper and Middle Jurassic) at surface, covers 3 % of this area

In southwest includes the basalt-bearing Broken Jug Formation.

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.

Morrison Formation and upper San Rafael Group (lowermost Cretaceous? - upper Jurassic) at surface, covers 3 % of this area

Morrison Formation and upper San Rafael Group

Alluvium (Holocene to upper Pleistocene) at surface, covers 2 % of this area

Alluvium

Madera Group (Pennsylvanian) at surface, covers 2 % 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.

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.

Yeso Formation (Leonardian) at surface, covers 2 % of this area

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

Artesia Group (Guadalupian) at surface, covers 2 % 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.

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

Limited to northeastern area.

San Rafael Group (Middle Jurassic) at surface, covers 2 % of this area

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

Graneros Shale (Cenomanian) at surface, covers 2 % of this area

Limited to northeastern area.

Morrison Formation (Upper Jurassic) at surface, covers 1 % of this area

Upper Jurassic nonmarine rocks.

Chinle Group (Upper to middle Triassic) at surface, covers 1 % 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.

Ogallala Formation (Lower Pliocene to middle Miocene) at surface, covers 1 % of this area

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

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided (Mesoproterozoic and Paleoproterozoic) at surface, covers 1 % of this area

Mesoproterozoic and Paleoproterozoic plutonic rocks, undivided

Paleoproterozoic granitic plutonic rocks (Paleoproterozoic) at surface, covers 1 % 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.

Entrada Sandstone (Middle Jurassic) at surface, covers 1 % of this area

Entrada Sandstone

Bull Canyon Formation (Norian) at surface, covers 0.9 % of this area

Bull Canyon Formation

Paleoproterozoic mafic metavolcanic rocks with subordinate felsic metavolcanic rocks (Paleoproterozoic) at surface, covers 0.7 % 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.

Mississippian rocks, undivided (Mississippian) at surface, covers 0.7 % 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.

Paleoproterozoic calc-alkaline plutonic rocks (Paleoproterozoic) at surface, covers 0.5 % of this area

Granodiorite, diorite, and gabbro complexes; 1.78-1.71 Ga; interpreted to be intrusive part of juvenile volcanic arc basement.

Piedmont alluvial deposits (Holocene to lower Pleistocene) at surface, covers 0.3 % 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.

Permian rocks, undivided (Permian) at surface, covers 0.3 % of this area

Permian rocks, undivided

Panther Seep Formation (Virgilian) at surface, covers 0.3 % of this area

In Organ, Franklin, and San Andres Mountains.

Basaltic to andesitic lava flows (Middle to lower Pleistocene) at surface, covers 0.2 % of this area

Includes vent deposits.

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.

Paleoproterozoic metasedimentary rocks (Paleoproterozoic) at surface, covers < 0.1 % 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.

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.

Redonda Formation (Upper Triassic) at surface, covers < 0.1 % of this area

Redonda 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.

Greenhorn Formation and Graneros Shale (Turonian and Cenomanian) at surface, covers < 0.1 % of this area

Limited to northeastern area.