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The Basin and Range Province is a vast physiographic region covering much of the inland Western United States and northwestern Mexico. It is defined by unique basin and range topography , characterized by abrupt changes in elevation, alternating between narrow faulted mountain chains and flat arid valleys or basins.
View of the Basin and Range Province from space. The Basin and Range Province is the most well known example of basin and range topography. Clarence Dutton compared the many narrow parallel mountain ranges that distinguish the unique topography of the Basin and Range to an "army of caterpillars crawling northward." [5]
Basin sagebrush, Wyoming big sagebrush, bluebunch wheatgrass, needlegrass, bluegrass, and Indian ricegrass are also present. The region covers 438 square miles (1,134 km 2) in Idaho and 52 square miles (130 km 2) in Utah, in the Raft River drainage. The land is used primarily for rangeland and irrigated agriculture. [2] [4]
The Bridgeport Valley is a large, fertile mountain basin between the eastern Sierra Nevada and the Bodie Hills of the U.S. state of California.The valley is 10 miles (16 km) long and 7.5 miles (12.1 km) wide, and is used primarily for ranching.
The Great Basin includes valleys, basins, lakes and mountain ranges of the Basin and Range Province. [ 20 ] The basin and range topography is the result of extension and thinning of the lithosphere , which is composed of crust and upper mantle .
The Great Basin montane forests ecoregion is located in the Great Basin region of Nevada, eastern California, and western Utah, in the Western United States.. The montane forests are often found on sky islands at elevations above the Great Basin Desert or xeric shrublands.
Crazy Mountains are a group of mountains that are located in the lower central Montana region. The structural basin is surrounded by the Castle Mountains, Shawmut anticlinal trend and the Huntley-Lake Basin fault-zone. [6] The Crazy Mountains have assemblages of diorite, gabbro, and peridotite as a result from laccoliths, sills and dikes. [7]
Basin and Range National Monument, Nevada. The Basin and Range National Monument area has geological, ecological, cultural, historical, paleoecological, seismological, archaeological, and paleoclimatological significance. [1] The area is located in a transitional region between the Mojave Desert and the Sagebrush Steppe of the Great Basin. [1]