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48-722: The Tewa Group is a group of geologic formations exposed in and around the Jemez Mountains of northern New Mexico . Radiometric dating gives it an age of 1.85 million to 72 thousand years, corresponding to the Pleistocene epoch . The Jemez Mountains lie on the intersection of the western margin of the Rio Grande Rift and the Jemez Lineament . Here magma produced from the fertile rock of an ancient subduction zone has repeatedly found its way to

96-447: A bachelor's degree or higher was estimated to be 50.6% of the population. 22.8% of the population was under the age of 18, 6.3% from 18 to 24, 27.5% from 25 to 44, 26.9% from 45 to 64, and 16.5% who were 65 years of age or older. The median age was 39.6 years. For every 100 females, there were 97.9 males. For every 100 females ages 18 and older, there were 97.6 males. The 2016-2020 5-year American Community Survey estimates show that

144-572: A group must not be defined by fossil taxonomy. Los Alamos, New Mexico Los Alamos ( Spanish : Los Álamos , meaning The Cottonwoods ) is a census-designated place in Los Alamos County, New Mexico , United States, that is recognized as one of the development and creation places of the atomic bomb —the primary objective of the Manhattan Project by Los Alamos National Laboratory during World War II . The town

192-460: A memorandum instructing them to travel to Santa Fe and report to the U.S. Army Corps of Engineers office at 109 East Palace Avenue. At that location, Dorothy McKibbin provided newcomers with the necessary documentation to get through security checkpoints (initially, letters signed by J. Robert Oppenheimer himself, and later, security passes), along with specific directions to the Hill. The project

240-736: A progression in age counterclockwise along the presumed ring fracture of the Valles caldera. The El Cajete, Battleship Rock, and Banco Bonito flows are the youngest flows in the Jemez volcanic field, erupting from 77.4 to 68.3 ka. The quartz latite of Cerro Rubio, originally included in the Tewa Group, has been reassigned to the Tschicoma Formation of the Polvadera Group based on radiometric dating and geochemistry. The group

288-672: A vast outflow sheet surrounding the Jemez Mountains. The Cerro Toledo Formation consists of rhyolitic domes erupted in the Toledo Embayment, a structural feature in the northeast caldera rim, between the Toledo and Valles events. It also includes ring fracture dome remnants of the Toledo event and mixed pumice and sediment beds separating the Otowi and Tsherige Members ( Pueblo Canyon Member ). Ages range from 1.54 Ma for

336-530: Is 93.3%, in comparison to New Mexico's 76.9% rate and America's average rate of 85%. The University of New Mexico also has a branch campus in Los Alamos. Los Alamos is the fifth-fastest-growing city in New Mexico, after Albuquerque , Rio Rancho , Las Cruces , and Ruidoso . The median household income in Los Alamos is $ 98,458, and per capita income is $ 54,067. Income is significantly higher than

384-518: Is a sequence of mostly rhyolite pyroclastic flows and domes that underlies much of the Valles Caldera and forms extensive outflow sheets surrounding the caldera . It has a maximum thickness of 1,050 m (3,440 ft). It overlies the Santa Fe , Keres , and Polvadera Groups to the east and south of the caldera and older rocks ranging in age from Paleoproterozoic to Permian to

432-650: Is an extensive system of trails within the canyons and into the mountains above the town, catering to all skill levels of running, hiking and mountain biking . The Aquatic Center is an indoor, Olympic-length public swimming pool with a therapy pool and lazy river, and a public 18-hole golf course (par 72, 6500 yards) has existed since 1947. Winter sports include skiing at the community-owned Pajarito Mountain Ski Area on 10,440 ft. Pajarito Mountain between November and April. The county maintains New Mexico's only refrigerated, NHL regulation, outdoor ice skating rink on

480-560: Is demographically unique compared to its surrounding counties and the state as a whole. Over 35% of the population of surrounding counties ( Rio Arriba , Santa Fe , and Sandoval ) and the state of New Mexico are Hispanic or Latino, while only about 20% of Los Alamosans are Hispanic or Latino. The white and especially the Asian populations of Los Alamos are significantly higher than the rest of New Mexico. The geography of Los Alamos lends itself to several sports and recreational activities. There

528-504: Is located on four mesas of the Pajarito Plateau , and had a population of about 13,200 as of 2020. It is the county seat and one of two population centers in the county known as census-designated places (CDPs); the other is White Rock . Los Alamos is a Spanish place name that typically refers to poplar or cottonwood trees . Alternatively, Los Alamos could refer to the large groves of quaking aspen that intersperse

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576-405: Is the area's largest employer with approximately 10,500 employees, and is foundational to the economy of Los Alamos, with an annual budget of about $ 2.45 billion. Approximately 40% of the laboratory's employees live in Los Alamos, while the remainder commute from Santa Fe, Española, Taos, and Albuquerque. About 66% of the people who work in the national laboratories commute daily to the lab; some take

624-452: Is the only hospital in Los Alamos and is a LifePoint Health hospital. The hospital provides "complete medical, surgical, obstetrical, pediatric, emergency, and diagnostic services" and employs about 300 Northern New Mexicans. Medical Associates of Northern New Mexico (MANNM) is a group of medical providers that offers family medicine, internal medicine, cardiology, nephrology, radiology, and endocrinology among its many services. During

672-842: The Cerro Toledo Formation , and the Valles Rhyolite . However, the Pueblo Canyon Member of the Cerro Toledo Formation was deposited between the Otowi Member and Tsherige Member of the Bandelier Tuff. The Bandelier Tuff is a sequence of rhyolitic pyroclastic flows erupted in three caldera eruptions, at 1.85 Ma (La Cueva Member), 1.62 Ma (Toledo event; Otowi Member), and 1.25 Ma (Valles event; Tsherige Member). These form

720-517: The attacks of September 11, 2001 , Pajarito Road has been restricted to LANL badge holders for security reasons. Los Alamos County Airport , located on the eastern edge of Los Alamos, is the only airport in the county. The main source of activity is from small private aircraft, with intermittent commercial commuter service. Albuquerque International Sunport is a 100-mile drive south of Los Alamos, and serves most national destinations. The 47-bed acute-care facility known as Los Alamos Medical Center

768-566: The Atomic City Transit, Rail Runner Express, use the Park and Ride, or carpool with other employees. Other major employers in Los Alamos include Los Alamos County , Los Alamos Public Schools , Los Alamos Medical Center , Smith's Food and Drug , Enterprise Bank & Trust, and Del Norte Credit Union. Los Alamos provides several transportation services: Los Alamos is relatively isolated, and can only be accessed from NM 4 from

816-469: The Ranch School and all remaining homesteads in the area so that the relatively isolated location could be used for the secretive Manhattan Project , which ultimately developed the world's first nuclear weapons. Facilities for research and development were quickly built and scientists and engineers from all over the world were assigned to the project; however, all information about the town and project

864-536: The Rio Grande and the eastern rim of the Valles Caldera on the Pajarito Plateau, approximately 35 mi (56 km) to the northwest of Santa Fe . The elevation at the post office is 7,320 feet (2,230 m) and total land area is 11.14 square miles (28.9 km ). The Los Alamos Townsite and White Rock are located on flat mesa tops separated by steep canyons, known as potreros . This location

912-445: The age of 18 and 3.6% of those ages 65 or over. As of the 2010 United States census , there were 12,019 people with a population density of 1,078.7 inhabitants per square mile (416.5/km ). The median age is 40 years. 24.8% of the people are under the age of 18, 4.8% are ages 18 to 24, 29.2% are ages 25 to 44, 28.2% are ages 45 to 64, and 12.9% are ages 65 years or older. For every 100 females, there were 101.3 males. Los Alamos

960-632: The area. "Over 200 species of birds have been reported" in the Pajarito Ornithological Survey conducted by LANL. Among these are broad-tailed hummingbirds , hairy woodpeckers , zone-tailed hawks , common ravens , western bluebirds , and great horned owls . Wildfires have affected the county, but the most destructive to the townsite was the Cerro Grande Fire of May 2000, which caused an estimated $ 1 billion in damages and destroyed more than 400 homes. The CDP

1008-735: The area. It is possible for only some of the strata making up a group to be divided into formations. An example of a group is the Glen Canyon Group , which includes (in ascending order) the Wingate Sandstone , the Moenave Formation , the Kayenta Formation , and the Navajo Sandstone . Each of the formations can be distinguished from its neighbor by its lithology , but all were deposited in

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1056-440: The coniferous forest on the mountainsides above the townsite, where they are distinctly visible during the autumn months due to their spectacular autumn colors . The ruins of Puebloan settlements, such as those located in nearby Bandelier National Monument and Tsankawi , and numerous other sites such as cliff dwellings indicate that the area has been inhabited during various eras since around 1150 AD. The first settlers on

1104-514: The county, and are primarily (but not exclusively) on DOE property. Contaminated sites vary widely in significance. Corrective action and environmental restoration has been deemed necessary for certain areas; LANL takes part in this process. Some residents have voiced concern about a lack of public participation and opportunity to comment on the cleanup schedule and funding. The 2020 United States census counted 13,179 people, 5,653 households, and 3,522 families in Los Alamos. The population density

1152-572: The homesteaders later moved down to the warmer Rio Grande Valley. In 1917, homesteader Harold H. Brook sold part of his land and buildings to Ashley Pond II, a businessman from Detroit who founded the Los Alamos Ranch School . The area was used to teach young men basic ranching and other outdoor survival skills. In 1943, during World War II , the United States Department of War exercised eminent domain over

1200-421: The laboratory itself and opened up the town for visits by the general public. The first visitor to enter the town that year without a permit from the federal government was New Mexico Governor Edwin L. Mechem . The AEC was later succeeded by the U.S. Department of Energy . Los Alamos became the shooting location and setting for the 2023 film Oppenheimer . Los Alamos is located in northern New Mexico between

1248-423: The median household income was $ 114,034 (with a margin of error of +/- $ 9,349) and the median family income was $ 139,184 (+/- $ 15,168). Males had a median income of $ 83,875 (+/- $ 7,095) versus $ 57,000 (+/- $ 11,331) for females. The median income for those above 16 years old was $ 72,606 (+/- $ 8,291). Approximately, 3.2% of families and 4.7% of the population were below the poverty line , including 4.2% of those under

1296-447: The median value of owner-occupied housing units is $ 281,500. Median gross rent is $ 921. 31.4% of households have children under the age of 18 living with them, 56.4% are married couples living together, 6.5% have a female householder with no husband present, and 34.0% are non-families. 29.8% of all households are made up of individuals, and 7.6% have someone living alone who is 65 years of age or older. Los Alamos National Laboratory

1344-540: The past also been used as units for chronostratigraphy and geochronology . These are the Rotliegend and Zechstein (both of Permian age); Buntsandstein , Muschelkalk , and Keuper ( Triassic in age); Lias , Dogger , and Malm ( Jurassic in age) groups. Because of the confusion this causes, the official geologic timescale of the ICS does not contain any of these names. As with other lithostratigraphic ranks,

1392-522: The plateau are thought to be Keres speaking Native Americans around the 10th century. Around 1300, Tewa settlers immigrated from the Four Corners Region and built large cities but were driven out within 50 years by Navajo and Apache raids and by drought. In the late 19th century, homesteaders utilized the land for ranching. Most homesteaders built simple log cabins that they only lived in during warm weather to feed livestock. Many of

1440-519: The public; being announced by the White House at 11 am on 6 August. A set of press releases were given out over three days. In the years after World War II, the laboratory was formally established as a research government facility under the civilian control of the U.S. Atomic Energy Commission , and is now known as Los Alamos National Laboratory . In 1957, the AEC pulled back the security perimeter to

1488-718: The region (in the valleys and at the base of the mountain). White Rock lies at the top of White Rock Canyon. Much of Los Alamos County is within the Española Ranger District of the Santa Fe National Forest . Los Alamos has a humid continental climate ( Dfb ) with four distinct seasons. Summer days are moderately warm in the 70s°F (low 20s°C) and 70s°F (high 20s°C), but reach 90 °F (32 °C) on only 5 days per year on average. Los Alamos' geographical location causes its wildlife and vegetation to be diverse compared to surrounding areas in

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1536-586: The rest of New Mexico. Los Alamos has the highest millionaire concentration of any US city, with 12.4 percent of households having at least $ 1 million in assets. This is a result of chemists, engineers, and physicists working at LANL since the Manhattan Project. Only 6.6% of people are below the poverty line; one-third the rate of New Mexico. As of January 2015, there were zero homeless individuals. There are 5,249 households and an average household size of 2.23 people. There are 5,863 housing units, and

1584-635: The same vast erg . Not all these formations are present in all areas where the Glen Canyon Group is present. Another example of a group is the Vadito Group of northern New Mexico . Although many of its strata have been divided into formations, such as the Glenwoody Formation , other strata (particularly in the lower part of the group) remain undivided into formations. Some well known groups of northwestern Europe have in

1632-690: The south and NM 502 from the east. NM 502 sees significantly more traffic because it connects with US 84/285, which delivers access to several Pueblo communities between Española and Santa Fe. Approximately 10,000 commuters use NM 502 daily. NM 502 begins at Pojoaque , and traverses San Ildefonso Pueblo and the Rio Grande . Interstate 25 is the nearest major interstate highway, and passes through or near Santa Fe , Albuquerque and Denver . There are three access roads between White Rock and Los Alamos—Main Hill Road, Jemez Road and Pajarito Road. Since

1680-603: The state. "The variation in elevation creates precipitation and temperature gradients that support a wide diversity of plant communities..." There are six different plant communities within the county; each is home to unique flora and fauna . Ponderosa pine trees are the most common trees at the elevation of Los Alamos (7,000 and 8,000 feet (2,100 and 2,400 m)). Common shrubs in the area include sagebrush , Gambel oak , and wild rose . Black bears (brown-color variation), elk , mule deer , bobcats , gray foxes , skunks and chipmunks are examples of mammals living in

1728-913: The sun-shaded floor of Los Alamos Canyon, almost beneath the Omega Bridge. Snowshoeing and cross-country skiing are possible at Valles Caldera National Preserve and other locations, weather permitting. Los Alamos is host to several sporting events: On November 10, 2015, the National Park Service and the U.S. Department of Energy announced the establishment of Manhattan Project National Historical Park in Los Alamos, along with units in Hanford, Washington and Oak Ridge, Tennessee . Los Alamos Public Schools provides public Kindergarten through High School education (5 elementary schools, 1 middle school, and 1 high school: Los Alamos High School ). The graduation rate, as of March 6, 2021,

1776-410: The surface along faults produced by rifting . This has produced a long-lived volcanic field , with the earliest eruptions beginning at least 13 million years ago in both the northern ( Polvadera Group ) and southern ( Keres Group ) portions of the volcanic field. High- silica eruptions of the Tewa Group began about 1.85 million years ago ( Ma ) and continued almost to the present day. The Tewa Group

1824-960: The west Los Posos dome to 1.20 Ma at Pinnacle Peak. The Valles Rhyolite consists of rhyolite domes and flows associated with caldera resurgence and with the ring fracture of the Valles event. It includes the most recent eruptions in the Jemez Mountains, ending with the Banco Bonito flow. The earliest members, the Deer Canyon Member and Redondo Creek Member, are associated with resurgence, with argon-argon ages of 1.23 to 1.28 Ma. The Cerro del Medio Member (1.169-1.229 Ma), Cerros del Abrigo Member (0.973 Ma), Cerro Santa Rosa Member (0.787-0.936 Ma), Cerro San Luis Member (0.800 Ma), Cerro Seco Member (0.800 to 0.77 Ma), San Antonio Mountain Member (0.557 Ma), and South Mountain Member (0.52 to 0.53 Ma) are individual ring fracture dome complexes that show

1872-664: The west and north. It forms the upper surfaces of the Pajarito Plateau east of the caldera and the Jemez Plateau west of the caldera. There is geochemical evidence that the Tewa Group originated through rejuvenation of intrusions associated with the Paliza Canyon Formation of the Keres Group . From oldest to youngest, the formations recognized within the Tewa Group are the Bandelier Tuff ,

1920-524: Was 1,186.4 inhabitants per square mile (458.1/km ). There were 6,026 housing units at an average density of 542.5 per square mile (209.5/km ). The racial makeup was 73.15% (9,640) white or European American (67.79% non-Hispanic white ), 0.99% (131) black or African-American , 0.74% (98) Native American or Alaska Native , 7.96% (1,049) Asian , 0.09% (12) Pacific Islander or Native Hawaiian , 3.95% (520) from other races , and 13.12% (1,729) from two or more races . Hispanic or Latino of any race

1968-429: Was 17.35% (2,287) of the population. Of the 5,653 households, 30.6% had children under the age of 18; 50.4% were married couples living together; 22.0% had a female householder with no spouse or partner present. 32.4% of households consisted of individuals and 10.8% had someone living alone who was 65 years of age or older. The average household size was 2.2 and the average family size was 2.9. The percent of those with

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2016-419: Was chosen for its relative inaccessibility to help protect the secret activities of the Manhattan Project. The town of Los Alamos was built on four potreros—Barranca Mesa, North Mesa, Los Alamos Mesa and South Mesa—along with the connecting communities at the base of the mountain. Los Alamos National Laboratory occupies half of South Mesa, Two Mile Mesa, Frijoles Mesa, Mesita de Buey and several nearby areas in

2064-444: Was evacuated for eight days. The Federal Emergency Management Agency (FEMA) built temporary housing on North Mesa for those who were displaced by the fire. Though there was no loss of life, other effects include damage to LANL facilities ( nuclear material was not affected), flash-flooding, and erosion. The Las Conchas Fire of June 26, 2011 burned about three times as many acres and also prompted evacuation of Los Alamos, but there

2112-504: Was first defined by R.L. Griggs in 1964 his study of groundwater resources near the town of Los Alamos, New Mexico . The group was named for the Tewa Mountains, an obsolete name for the Jemez Mountains. R.L. Smith, R.A. Bailey, and C.S. Ross adopted Grigg's nomenclature in 1969 as part of their work establishing the stratigraphy of the Jemez Mountains, but proposing some further subdivisions of formations and members. The stratigraphy

2160-427: Was further concealed by designating its mailing address as PO Box 1663, Santa Fe, N.M. All incoming truckloads were falsely labeled as common items in order to conceal the true nature of their contents, and any outbound correspondence by those working and living in Los Alamos was censored by military officials. Not until after the bombing of Hiroshima in 1945 was information about the Manhattan Project released to

2208-425: Was further refined by Gardner and collaborators in 2010. Group (geology) Groups are useful for showing relationships between formations, and they are also useful for small-scale mapping or for studying the stratigraphy of large regions. Geologists exploring a new area have sometimes defined groups when they believe the strata within the groups can be divided into formations during subsequent investigations of

2256-419: Was held secret from the public. Los Alamos was referred to under the code name " Site Y " by military personnel, and was known only as "The Hill" by many in nearby Santa Fe. Los Alamos was originally built as a closed city accessible from the outside world through only two gates. The specific location of the project was a tightly guarded secret. All employees recruited to work at the Los Alamos site were given

2304-507: Was no damage to property in Los Alamos. It was the biggest wildfire New Mexico had endured until the Calf Canyon-Hermits Peak fire in 2022. Wildfires have altered plant communities in the area. Plant species are migrating to cover burn areas. Over two thousand sites in the area have been determined to have been impacted as a result of past activities at LANL. The location of these sites have been identified throughout

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