Oscura Mountains, originally known to the Spanish as the Sierra Oscura, are a ridge of mountains, trending north and south, east of the Jornada del Muerto and west of the Tularosa Valley. The word oscura means "dark" and refers to the dark color of the mountains due to the Pinyon-juniper vegetation at their higher elevations. [1] The Oscuras are located in Socorro County and Lincoln County, New Mexico. [2] Their southern end is at 33°30′30″N106°18′45″W / 33.50833°N 106.31250°W and their northern end is at 33°49′15″N106°22′20″W / 33.82083°N 106.37222°W near North Oscura Peak. [2] Their highest elevation is Oscura Peak at 8,625 feet (2,629 meters). [3]
The Oscura Mountains extend southward about 30 mi (48 km) from U.S. Route 380 and are 6 mi (9.7 km) to 10 mi (16 km) wide. To the west, dropping off sharply from the crest of the Oscuras, the austere desert of the Jornada del Muerto (Spanish: Dead Man's Journey) has an average elevation of about 5,000 ft (1,500 m). Southwest and separated from the Oscuras by Oscura Gap are the lower-lying Little Burro Mountains. The San Andres Mountains lie beyond the Little Burro Mountains to the south and are separated from them by Mockingbird Gap. The Oscura range is bounded on the north by Wash Hale Canyon. The Oscuras slope off more gently to the east and are bounded on the northeast by the Chupadera Mesa. The Tularosa Basin to the east also has an average elevation of about 5,000 ft (1,500 m) [2] [4]
The Oscura Mountains are located within the White Sands Missile Range and public access is restricted. The Trinity site, the location of the first test of an atomic bomb in 1945, is 11 km (6.8 mi) northwest of Oscura Peak. [5] North Oscura Peak is the location of an Air Force Research Laboratory (AFRL) site. It rises to an elevation of 7,976 feet (2,431 meters). [6]
The Oscura Mountains are a Sky island rising above semi-arid steppe and arid desert. The higher elevations of the mountains result in cooler temperatures and higher precipitation. The surrounding areas receive about 10 in (25 cm) annually in precipitation while the higher elevations of the Oscuras receive from 16 in (41 cm) to 20 in (51 cm) average precipitation which is sufficient to support a pinyon-juniper woodland. Surface water is rare except for ephemeral streams on the east side of the range and a few springs. Most precipitation is received between July and October. Average maximum temperatures at North Oscura peak, elevation 7,976 ft (2,431 m), are from 27.3 °C (81.1 °F) in June to 5.2 °C (41.4 °F) in January. Average minimum temperatures range from 13.5 °C (56.3 °F) in July to −3.2 °C (26.2 °F) in January. [7] [8]
Five vegetation types typical of New Mexico clothe the Oscura mountains. At the highest elevations is a pinyon woodland mainly on the eastern slopes and consisting mostly of two-needle pinyon. Below the pinyons in elevation on the eastern flanks is a juniper woodland interspersed with savannas. Still lower on the eastern slopes and also on the western slopes is montane scrub, consisting mostly of mountain mahogany and wavy leaf oak. Chaparral consisting mostly of shrub live oak and grassland dominated by blue gramma is found at low to mid elevations. Large animals include mule deer, black bear, and the non-native oryx. [9]
The Great Basin Desert is part of the Great Basin between the Sierra Nevada and the Wasatch Range. The desert is a geographical region that largely overlaps the Great Basin shrub steppe defined by the World Wildlife Fund, and the Central Basin and Range ecoregion defined by the U.S. Environmental Protection Agency and United States Geological Survey. It is a temperate desert with hot, dry summers and snowy winters. The desert spans large portions of Nevada and Utah, and extends into eastern California. The desert is one of the four biologically defined deserts in North America, in addition to the Mojave, Sonoran, and Chihuahuan Deserts.
Pinus monophylla, the single-leaf pinyon, is a pine in the pinyon pine group, native to North America. The range is in southernmost Idaho, western Utah, Arizona, southwest New Mexico, Nevada, eastern and southern California and northern Baja California.
The San Francisco Peaks are a volcanic mountain range in the San Francisco volcanic field in north central Arizona, just north of Flagstaff and a remnant of the former San Francisco Mountain. The highest summit in the range, Humphreys Peak, is the highest point in the state of Arizona at 12,633 feet (3,851 m) in elevation. The San Francisco Peaks are the remains of an eroded stratovolcano. An aquifer within the caldera supplies much of Flagstaff's water while the mountain itself is in the Coconino National Forest, a popular recreation site. The Arizona Snowbowl ski area is on the western slopes of Humphreys Peak, and has been the subject of major controversy involving several tribes and environmental groups.
The Davis Mountains, originally known as Limpia Mountains, are a range of mountains in West Texas, located near Fort Davis, after which they are named. The fort was named for then United States Secretary of War and later Confederate President Jefferson Davis. They are a popular site for camping and hiking and the region includes Fort Davis National Historic Site and Davis Mountains State Park. The historical and architectural value of the fort, alongside the rugged natural environment of the park are a significant destination for tourism in Texas.
The San Andres Mountains are a mountain range in the southwestern U.S. state of New Mexico, in the counties of Socorro, Sierra, and Doña Ana. The range extends about 75 miles (121 km) north to south, but are only about 12 miles (19 km) wide at their widest. The highest peak in the San Andres Mountains is Salinas Peak, at 8,965 feet (2,733 m).
The Sacramento Mountains are a mountain range in the south-central part of the U.S. state of New Mexico, lying just east of Alamogordo in Otero County. From north to south, the Sacramento Mountains extend for 85 miles (137 km), and from east to west they encompass 42 miles (68 km).
The Mormon Mountains are located in Lincoln and Clark counties in Nevada, between 16 and 28 miles (45 km) northwest of Mesquite on I–15 in the Virgin Valley, east of the Meadow Valley Mountains and Meadow Valley and northeast of Moapa Valley. The highest point in the range is Mormon Peak, at 7,414 feet (2,260 m) above sea level. Another smaller mountain range lies to the east, called the East Mormon Mountains. The south fork of the Toquop Wash drains the east side of the range and continues on through the N–S linear ridge of the East Mormon Mountains.
The Kingston Range, sometimes called the Kingston Mountains, is located in Inyo and San Bernardino counties in the Mojave Desert in eastern California. The range reaches a height of 7,323 feet (2,232 m) above sea level at Kingston Peak.
The Pine Nut Mountains are a north–south mountain range in the Great Basin, in Douglas and Lyon counties of northwestern Nevada, United States. The highest mountain in the range is Mount Siegel at 9,456 ft.
The Tularosa Basin is a graben basin in the Basin and Range Province and within the Chihuahuan Desert, east of the Rio Grande in southern New Mexico and West Texas, in the Southwestern United States.
The Carrizozo volcanic field is a monogenetic volcanic field located in New Mexico, US. The volcanic field consists of two lava flows, the Broken Back flow and the Carrizozo lava flow, the second youngest in New Mexico. Both lava flows originated from groups of cinder cones. The Broken Back flow is approximately 16 kilometres (10 mi) long and the Carrizozo, one of the largest in the world, is 68 kilometres (42 mi) long, covering 328 square kilometres (127 sq mi) with a volume of 4.2 cubic kilometres (1.0 cu mi).
North Oscura Peak, is a summit in the Oscura Mountains in Socorro County, New Mexico is the location of an Air Force Research Laboratory (AFRL) site in the northern portion of the White Sands Missile Range. It rises to an elevation of 7,976 feet.
The Northern Basin and Range ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency (EPA) in the U.S. states of Oregon, Idaho, Nevada, Utah, and California. It contains dissected lava plains, rolling hills, alluvial fans, valleys, and scattered mountain ranges in the northern part of the Great Basin. Although arid, the ecoregion is higher and cooler than the Snake River Plain to the north and has more available moisture and a cooler climate than the Central Basin and Range to the south. Its southern boundary is determined by the highest shoreline of Pleistocene Lake Bonneville, which once inundated the Central Basin and Range. The western part of the region is internally drained; its eastern stream network drains to the Snake River system.
The San Andres National Wildlife Refuge is located in the southern San Andres Mountains of southcentral New Mexico, USA. The refuge, which lies within the northernmost extension of the Chihuahuan Desert, has elevations ranging from 4,200 feet (1,300 m) to 8,239 feet (2,511 m) feet. Refuge habitats vary from creosote and Chihuahuan desert grasslands in the bajadas to pinyon-juniper woodlands at higher elevations. A few springs, seeps, and seasonal streams provide water for wildlife and riparian habitats in the refuge.
Pinyon–juniper woodland, also spelled piñon–juniper woodland, is a biome found mid-elevations in arid regions of the Western United States, characterized by being an open forest dominated by low, bushy, evergreen junipers, pinyon pines, and their associates. At lower elevations, junipers often predominate and trees are spaced widely, bordering on and mingling with grassland or shrubland, but as elevation increases, pinyon pines become common and trees grow closer, forming denser canopies. Historically, pinyon-juniper woodland has provided a vital source of fuel and food for peoples of the American Southwest.
The San Augustin Mountains are a small mountain subrange located at the southern terminus of the San Andres Mountains east of Las Cruces, New Mexico.
The Great Basin montane forests is an ecoregion of the Temperate coniferous forests biome, as designated by the World Wildlife Fund (WWF).
The pinyon jay is a species of jay, and is the only member of the genus Gymnorhinus. Native to Western North America, the species ranges from central Oregon to northern Baja California, and eastward as far as western Oklahoma, though wanderers are often sighted beyond this range. It is typically found within foothills, especially where pinyon pines occur.
Sagebrush scrub is a vegetation type (biome) of mid to high elevation Western United States deserts characterized by low growing, drought resistant shrubs including sagebrush and its associates. It is the dominant vegetation type of the Great Basin Desert, occurs along the margins of the Mojave Desert, including in the southern slopes of the Sierra Nevadas and Transverse Ranges of California, and occurs in the Colorado Plateau and Canyonlands region, where it may be referred to as cool desert shrub.
Oscura Peak is a mountain summit in the Oscura Mountains in Socorro County, New Mexico. Its elevation is 8,625 feet.