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Plains of San Agustin
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.〔''New Mexico Atlas and Gazetteer'', Second Edition, DeLorme Mapping, 2000.〕
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.
==Geology==
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.〔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, 〕 The flat floor of the plains was created by a Pleistocene lake (Lake San Agustin).〔Halka Chronic, ''Roadside Geology of New Mexico'', Mountain Press Publishing, Missoula, 1987, ISBN 0-87842-209-9.〕 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.〔
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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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