World Library  
Flag as Inappropriate
Email this Article

Plains of San Agustin

Article Id: WHEBN0003191730
Reproduction Date:

Title: Plains of San Agustin  
Author: World Heritage Encyclopedia
Language: English
Subject: Luera Mountains, Catron County, New Mexico, Langmuir Laboratory for Atmospheric Research, Canyon Creek Mountains, San Francisco River
Publisher: World Heritage Encyclopedia

Plains of San Agustin

Location of the San Agustin Plains within New Mexico
Plains of San Agustin watershed

The Plains of San Agustin (sometimes listed as the Plains of San Augustin) is a region in the southwestern U.S. state of New Mexico in the San Agustin Basin, south of U.S. Highway 60. The area spans Catron and Socorro Counties, about 50 miles (80 km) west of the town of Socorro and about 25 miles north of Reserve. The plains extend roughly northeast-southwest, with a length of about 55 miles (88 km) and a width varying between 5–15 miles (8–24 km). The basin is bounded on the south by the Luera Mountains and Pelona Mountain (outliers of the Black Range); on the west by the Tularosa Mountains; on the north by the Mangas, Crosby, Datil, and Gallinas Mountains; and on the east by the San Mateo Mountains. The Continental Divide lies close to much of the southern and western boundaries of the plains.[1]

According to UFOlogists, a spacecraft had a forced landing somewhere on the Plains of San Agustin in 1947, possibly containing small non-human passengers, an event thought to be connected to the Roswell UFO incident.[2]


  • Geology 1
  • Landmarks 2
  • Notes 3
  • Sources 4
  • External links 5


Geologically, the Plains of San Agustin lie within the Mogollon-Datil volcanic field, just south of the southeast edge of the Colorado Plateau, and west of the Rio Grande Rift Valley. The basin is a graben (a downdropped block which subsided between parallel faults). The graben is younger than the Datil-Mogollon volcanic eruptions.[3] The flat floor of the plains was created by a Pleistocene lake (Lake San Agustin).[4] Although the graben has dropped an estimated 4,000 ft., the surface relief has been reduced to about 2,000 ft. by sedimentation. A great deal of the sediments entered the San Agustin basin prior to the formation of Lake San Agustin in the last glacial period. There is no evidence of tectonic activity in the area after Lake San Agustin became extinct.[3]

Ecologically, the plains lie near the northern end of the Chihuahuan Desert (though the ranges surrounding the Gila River headwaters intervene), which is dominated by shrublands.


Very Large Array, on the Plains of San Agustin
Satellite photo of the Plains of San Agustin

The plains are probably best known as the site of the Very Large Array, a radio astronomy observatory. The plains were chosen for the observatory because of their isolated location away from large population centers, and the partial shielding effect of the surrounding mountain ranges. The edges of the plains have sites of archaeological interest such as a prehistoric rockshelter known as Bat Cave.

Other sites in the area include a ghost town called Old Horse Springs and the Ake Site, a prehistoric occupation site.


  1. ^ New Mexico Atlas and Gazetteer, Second Edition, DeLorme Mapping, 2000.
  2. ^ Friedman, Stanton T. and Berliner, Don (1992). Crash at Corona: The U.S. Military Retrieval and Cover-up of a UFO. New York: Paragon House. p. 134.  
  3. ^ a b Stearns, Charles E. (1962) Geology of the north half of the Pelona Quadrangle, Catron County, New Mexico Bulletin 78, New Mexico Bureau of Mines and Mineral Resources, Socorro, NM, OCLC 3926534
  4. ^ Halka Chronic, Roadside Geology of New Mexico, Mountain Press Publishing, Missoula, 1987, ISBN 0-87842-209-9.


  • Powers, William E. (1939) "Basin and Shore Features of the Extinct Lake, San Augustin, New Mexico" Journal of Geomorphology 2: pp. 345–356
  • Weber, Robert H. (1994) "Pluvial Lakes of the Plains of San Augustin" In Chamberlin, R.M. et al. (1994) Mogollon Slope, West-Central New Mexico and East-Central Arizona pp. 9–11, New Mexico Geological Society, Forty-Fifth Annual Field Conference, Socorro, New Mexico.
  • (2007) "Paleoindian Geoarchaeology and the Archaeological Potential on the Plains of San Augustin, New Mexico" Argonaut Archaeological Research Fund, Department of Anthropology and Department of Geosciences, University of Arizona, Tucson, Arizona, USAHolliday, Vance T. 'et al.
  • Woodward, Susan L. (November 1996) "North American Deserts" Geography Department, Radford University, Radford, Virginia, USA

External links

  • U.S. Geological Survey Geographic Names Information System: Plains of San Agustin

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.