Great Basin

The Great Basin is the largest area of contiguous endorheic watersheds in North America. It spans nearly all of Nevada, much of Oregon and Utah, and portions of California, Idaho, and Wyoming. It is noted for both its arid climate and the basin and range topography that varies from the North American low point at Badwater Basin in Death Valley to the highest point of the contiguous United States, less than 100 miles (160 km) away at the summit of Mount Whitney. The region spans several physiographic divisions, biomes, ecoregions, and deserts.

Great Basin
Relief map with Great Basin overlay
LocationUnited States
Coordinates40°40′N 117°40′W[1]
Highest point
 – elevation
 – coordinates		Mount Whitney summit
14,505 ft (4,421 m)
36°34′42.89″N 118°17′31.18″W
Area209,162 sq mi (541,730 km2)[2]

Definition
The hydrographic Great Basin (magenta outline), distinguished from the Great Basin Desert (black), and the Basin and Range Geological Province (teal).[3]

The term "Great Basin" is applied to hydrographic,[3][4]:11 biological,[3] floristic,[4]:21 physiographic,[4]:14 topographic,[3] and ethnographic geographic areas.[4]:34 The name was originally coined by John C. Fremont, who, based on information gleaned from Joseph R. Walker as well as his own travels, recognized the hydrographic nature of the landform as "having no connection to the ocean".[4]:8–9 The hydrographic definition is the most commonly used,[3] and is the only one with a definitive border. The other definitions yield not only different geographical boundaries of "Great Basin" regions, but regional borders that vary from source to source.[4]:11

The Great Basin Desert is defined by plant and animal communities, and, according to the National Park Service, its boundaries approximate the hydrographic Great Basin, but exclude the southern "panhandle".[3]

The Great Basin Floristic Province was defined by botanist Armen Takhtajan to extend well beyond the boundaries of the hydrographically defined Great Basin: it includes the Snake River Plain, the Colorado Plateau, the Uinta Basin, and parts of Arizona north of the Mogollon Rim.[5]

The Great Basin physiographic section is a geographic division of the Basin and Range Province defined by Nevin Fenneman in 1931.[6] The United States Geological Survey adapted Fenneman's scheme in their Physiographic division of the United States.[7] The "section" is somewhat larger than the hydrographic definition.

The Great Basin Culture Area or indigenous peoples of the Great Basin is a cultural classification of indigenous peoples of the Americas and a cultural region located between the Rocky Mountains and the Sierra Nevada. The culture area covers approximately 400,000 sq mi (1,000,000 km2),[8] or just less than twice the area of the hydrographic Great Basin.

Hydrology
For the subdivisions and major waterways of the Great Basin, see List of Great Basin watersheds and List of rivers of the Great Basin.
The Tule Valley watershed and the House Range (Notch Peak) are part of the Great Basin's Great Salt Lake hydrologic unit

The hydrographic Great Basin is a 209,162-square-mile (541,730 km2) area that drains internally. All precipitation in the region evaporates, sinks underground or flows into lakes (mostly saline). As observed by Fremont, creeks, streams, or rivers find no outlet to either the Gulf of Mexico or the Pacific Ocean. The region is bounded by the Wasatch Mountains to the east, the Sierra Nevada and Cascade Ranges to the west, and the Snake River Basin to the north. The south rim is less distinct. The Great Basin includes most of Nevada, half of Utah, substantial portions of Oregon and California, and small areas of Idaho, Wyoming, and Mexico. The term "Great Basin" is slightly misleading; the region is actually made up of many small basins. The Great Salt Lake, Pyramid Lake, and the Humboldt Sink are a few of the "drains" in the Great Basin.[3] The Salton Sink is another closed basin within the Great Basin.[9]

The Great Basin Divide separates the Great Basin from the watersheds draining to the Pacific Ocean. The southernmost portion of the Great Basin is the watershed area of the Laguna Salada. The Great Basin's longest and largest river is the Bear River of 350 mi (560 km),[10] and the largest single watershed is the Humboldt River drainage of roughly 17,000 sq mi (44,000 km2). Most Great Basin precipitation is snow, and the precipitation that neither evaporates nor is extracted for human use will sink into groundwater aquifers, while evaporation of collected water occurs from geographic sinks.[11] Lake Tahoe, North America's largest alpine lake,[12] is part of the Great Basin's central Lahontan subregion.

Ecology
Main articles: Great Basin Desert and Mojave Desert
Ecoregions as currently delineated by the Environmental Protection Agency[13] and World Wildlife Fund[14]
Great Basin snowstorm in the Snake Valley of Utah and Nevada

The hydrographic Great Basin contains multiple deserts and ecoregions, each with its own distinctive set of flora and fauna.[3] The ecological boundaries and divisions in the Great Basin are unclear.[15]

The Great Basin overlaps four different deserts: portions of the hot Mojave and Colorado (a region within the Sonoran desert) Deserts to the south, and the cold Great Basin and Oregon High Deserts in the north. The deserts can be distinguished by their plants: the Joshua tree and creosote bush occur in the hot deserts, while the cold deserts have neither. The cold deserts are generally higher than the hot and have more even spread of precipitation throughout the year.[16]

The climate and flora of the Great Basin is strongly dependent on elevation; as the elevation increases, the temperature decreases and precipitation increases. Because of this, forests can occur at higher elevations. Utah juniper/single-leaf pinyon (southern regions) and mountain mahogany (northern regions) form open pinyon-juniper woodland on the slopes of most ranges. Stands of limber pine and Great Basin bristlecone pine (Pinus longaeva) can be found in some of the higher ranges. In riparian areas with dependable water cottonwoods (Populus fremontii) and quaking aspen (Populus tremuloides) groves exist.

Because the forest ecosystem is distinct from a typical desert, some authorities, such as the World Wildlife Fund, separate the mountains of the Great Basin desert into their own ecoregion: the Great Basin montane forests.[17] Many rare and endemic species occur in this ecoregion, because the individual mountain ranges are isolated from each other. During the Last Glacial Period, the Great Basin was wetter. As it dried during the Holocene epoch, some species retreated to the higher isolated mountains and have high genetic diversity.[17]

Other authorities divide the Great Basin into different ecoregions, depending on their own criteria. Armen Takhtajan defined the "Great Basin floristic province". The U.S. Environmental Protection Agency divides the Great Basin into three ecoregions roughly according to latitude: the Northern Basin and Range ecoregion, the Central Basin and Range ecoregion, and the Mojave Basin and Range ecoregion.

Fauna

Great Basin wildlife includes pronghorn, mule deer, mountain lion, and lagomorphs such as black-tailed jackrabbit and desert cottontail and the coyotes that prey on them. Packrats, kangaroo rats and other small rodents are also common, and are predominantly nocturnal. Elk and bighorn sheep are present but uncommon. Small lizards such as the Great Basin fence lizard, longnose leopard lizard and horned lizard are common, especially in lower elevations. Rattlesnakes and gopher snakes are also present. The Inyo Mountains salamander is endangered. Shorebirds such as phalaropes and curlews can be found in wet areas. American white pelicans are common at Pyramid Lake. Golden eagles are also very common in the Great Basin.[18] Mourning dove, western meadowlark, black-billed magpie, and common raven are other common bird species.

Two endangered species of fish are found in Pyramid Lake: the Cui-ui sucker fish (endangered 1967) and the Lahontan cutthroat trout (threatened 1970).[19]

Large invertebrates include tarantulas (genus Aphonopelma) and Mormon crickets. Exotic species, including chukar, grey partridge, and Himalayan snowcock, have been successfully introduced to the Great Basin, although the latter has only thrived in the Ruby Mountains. Cheatgrass, an invasive species which was unintentionally introduced, forms a critical portion of their diets. Feral horses (mustangs) and feral burros are highly reproductive, and ecosystem-controversial, alien species. Most of the Great Basin is open range and domestic cattle and sheep are widespread.

Geography
Basin and Range topography as seen from the air

The Great Basin includes valleys, basins, lakes and mountain ranges of the Basin and Range Province.[20] Geographic features near the Great Basin include the Continental Divide of the Americas, the Great Divide Basin, and the Gulf of California.

Map showing the Great Basin physiographic section (shown as 22a)

Great Basin physiographic section

The Great Basin physiographic section of the Basin and Range Province contains the Great Basin, but extends into eastern Oregon, southern Idaho, and the Colorado River watershed (including the Las Vegas metropolitan area and the northwest corner of Arizona).[21] The Basin and Range region is the product of geological forces stretching the earth's crust, creating many north-south trending mountain ranges. These ranges are separated by flat valleys or basins. These hundreds of ranges make Nevada the most mountainous state in the country.[3]

Settlements and roads

The Great Basin's two most populous metropolitan areas are the Reno-Sparks metropolitan area to the west and Wasatch Front to the east. The region between these two areas is sparsely populated, but includes the smaller cities of Elko, Ely, Wendover, West Wendover, and Winnemucca. To the north are; in California Susanville, in Oregon Burns and Hines, in Idaho Malad and in Wyoming Evanston. To the south are Cedar City, Tonopah, and Bishop and the very southern area of the basin has the communities of Pahrump, Palmdale, Victorville, and Palm Springs. Interstate Highways traversing the Great Basin are Interstate 80 (I-80) and I-15, and I-70 and I-84 have their respective endpoints within its boundaries. Other major roadways are U.S. Route 6 (US 6), US 50, US 93, US 95 and US 395. The section of US 50 between Delta, Utah, and Fallon, Nevada, is nicknamed "The Loneliest Road in America",[22] and Nevada State Route 375 is designated the "Extraterrestrial Highway".[23] The Great Basin is traversed by several rail lines including the Union Pacific Railroad's Overland Route (Union Pacific Railroad) through Reno and Ogden, Feather River Route, Central Corridor and Los Angeles and Salt Lake Railroad.

History

Sediment build-up over thousands of years filled the down-faulted basins between ranges and created relatively flat lacustrine plains from Pleistocene lake beds of the Great Basin.[24] For example, after forming about 32,000 years ago, Lake Bonneville overflowed about 14,500 years ago in the Bonneville Flood through Red Rock Pass and lowered to the "Provo Lake"[25] level (the Great Salt Lake, Utah Lake, Sevier Lake, Rush Lake, and Little Salt Lake remain).[26] Lake Lahontan, Lake Manly, and Lake Mojave were similar Pleistocene lakes.

Native American tribes that inhabited the Great Basin were divided between the "Great Basin" and, in the Colorado desert region, the "California" tribal classifications.

Paleo-Indian habitation by the Great Basin tribes began as early as 10,000 B.C. (the Numic-speaking Shoshonean peoples arrived as late as 1000 A.D.).[27] Archaeological evidence of habitation sites along the shore of Lake Lahontan date from the end of the ice age when its shoreline was approximately 500 feet (150 m) higher along the sides of the surrounding mountains. The Great Basin was inhabited for at least several thousand years by Uto-Aztecan language group-speaking Native American Great Basin tribes, including the Shoshone, Ute, Mono, and Northern Paiute.

European exploration of the Great Basin occurred during the 18th century Spanish colonization of the Americas. The first immigrant American to cross the Great Basin from the Sierra Nevada was Jedediah Strong Smith in 1827.[28] Peter Skene Ogden of the British Hudson's Bay Company explored the Great Salt Lake and Humboldt River regions in the late 1820s, following the eastern side of the Sierra Nevada to the Gulf of California.[29] Benjamin Bonneville explored the northeast portion during an 1832 expedition. The United States had acquired control of the area north of the 42nd parallel via the 1819 Adams–Onís Treaty with Spain and 1846 Oregon Treaty with Britain. The US gained control of most of the rest of the Great Basin via the 1848 Mexican Cession. The first non-indigenous settlement was in 1847 in the Great Salt Lake Valley, leading to first American religious settlement effort of the Mormon provisional State of Deseret in 1849 in present-day Utah and northern Nevada. Later settlements were connected with the eastern regions of the 1848 California Gold Rush, with its immigrants crossing the Great Basin on the California Trail along Nevada's Humboldt River to Carson Pass in the Sierras. The Oregon Territory was established in 1848 and the Utah Territory in 1850.

In 1869 the First Transcontinental Railroad was completed at Promontory Summit in the Great Basin.[30] Around 1902, the San Pedro, Los Angeles and Salt Lake Railroad was constructed in the lower basin and Mojave Desert for California-Nevada rail service to Las Vegas, Nevada.

To close a 1951 Indian Claims Commission case, the Western Shoshone Claims Distribution Act of 2004 established the United States payment of $117 million to the Great Basin tribe for the acquisition of 39,000 square miles (100,000 km2).

The Dixie Valley, Nevada, earthquake (6.6–7.1) in the Great Basin was in 1954.

Climate
For more detail of Great Basin climate, see Great Basin Desert § Climate, and Mojave Desert § Climate.
Wah Wah Valley, Utah, thunderstorm

Climate varies throughout the Great Basin by elevation, latitude, and other factors. Higher elevations tend to be cooler and receive more precipitation. The western areas of the basin tend to be drier than the eastern areas because of the rain shadow of the Sierra Nevada. Most of the basin experiences a semi-arid or arid climate with warm summers and cold winters. However, some of the mountainous areas in the basin are high enough in elevation to experience an alpine climate. Due to the region's altitude and aridity, most areas in the Great Basin experience a substantial diurnal temperature variation.

Significant special designations
gollark: Turns out my experiment is *today* in six hours; oops! Can anyone catch?
gollark: Oops. Need to alt-tab less. Sorry.
gollark: Yep!
gollark: *remains excited for experiments on Saturday*
gollark: I *may* not be available then.

See also

References
  1. "Great Basin (2087988)". Geographic Names Information System. United States Geological Survey. Retrieved 2011-10-01.
  2. "What is the WBD?". U.S. Geological Survey. Retrieved 2010-10-23. GIS files used for both the acreage calculations and the overlay of the above map.
  3.  This article incorporates public domain material from the National Park Service document: "What is the Great Basin?". Retrieved 2015-07-14.
  4. Grayson, Donald K. (1993). The Desert's Past. Washington and London: Smithsonian Institution Press. ISBN 1560982225.
  5. Thorne, Robert F. "Phytogeography of North America North of Mexico". Archived from the original on 2004-03-17.
  6. Fenneman, Nevin Melancthon (1931). Physiography of western United States. McGraw-Hill. pp. 326–328. OCLC 487636.
  7. "Physiographic Regions". United States Geological Survey. 2003-04-17. Archived from the original on 2006-05-15.
  8. Pritzker, Barry M (2000). A Native American Encyclopedia: History, Culture, and Peoples. Oxford: Oxford University Press. p. 220. ISBN 978-0-19-513877-1. Retrieved 2010-06-04 – via Internet Archive.
  9. "Salton Sea: California's Everglades" (PDF). Redlands Institute. p. 6. Retrieved 2015-08-02.
  10. "Bear River Watershed Description". Bear River Watershed Information System. Archived from the original on 2011-07-19. Retrieved 2010-04-28. (an additional ~1% is in the SW corner of WY)
  11. "Great Basin". Geologic Provinces of the United States: Basin and Range Province. nature.nps.gov: National Park Service. Archived from the original on 2009-01-16. Retrieved 2009-01-10.
  12. "Amazing Lake Tahoe". Lake Tahoe Visitors Authority. Archived from the original on 2008-12-07. Retrieved 2008-10-26.
  13. Level III and IV Ecoregions of the Continental United States, EPA, archived from the original on 2016-04-12, retrieved 2016-03-31
  14. "Great Basin shrub steppe". Terrestrial Ecoregions. World Wildlife Fund.
  15. Brussard, P.F.; Charlet, D.A.; Dobkin, D.S.; Ball, L.C.; et al. (1998). "Great Basin-Mojave Desert Region" (PDF). In Mac, M.J.; Opler, P.A.; Puckett Haeker, C.E.; et al. (eds.). Status and trends of the nation’s biological resources. 2. Reno, Nevada: U.S. Geological Survey.
  16. "Deserts of North American". Encyclopedia of Earth.
  17. "Great Basin montane forests". Terrestrial Ecoregions. World Wildlife Fund.
  18. Schmitt, Dave N. (Winter 1995). "The Taphonomy of Golden Eagle Prey Accumulations at Great Basin Roosts" (PDF). J. Ethnobiol. 15 (2): 237–256.
  19. Hogan, C.Michael; Papineau, Marc; et al. (1987). Development of a dynamic water quality simulation model for the Truckee River. Environmental Protection Agency Technology Series. Washington D.C.: Earth Metrics Inc.
  20. "Basin and Range Province". Geologic Provinces of the United States. United States Geological Survey. 2004. Archived from the original on 2009-01-25. Retrieved 2009-01-10.
  21. "Physiographic regions" (PDF). Tapestry of Time and Terrain. USGS.
  22. Nevada Commission on Tourism. The Official Hwy 50 Survival Guide: The Loneliest Road in America (PDF). Nevada Commission on Tourism. Archived from the original (PDF) on November 30, 2010. Retrieved December 15, 2007.
  23. "Tourism Commission Has Really Gone Far Out There". Las Vegas Sun. July 5, 1996. Retrieved January 13, 2009.
  24. Jackson, Richard H.; Stevens, Dale J. (1981). "Physical and Cultural Environment of Utah Lake and Adjacent Areas". Great Basin Naturalist Memoirs (5: Utah Lake Monograph): 5. Retrieved 2010-04-06.
  25. Gilbert, Grove Karl (1890). Lake Bonneville. United States Geological Survey. p. 127. Retrieved 2010-04-23 – via Internet Archive.
  26. Morgan, Dale L (1947). The Great Salt Lake. Salt Lake City: University of Utah Press. p. 22. ISBN 0-87480-478-7.
  27. "Archaeology, Cultural Transmission, and the Indigenous Native American Indians of the Great Basin Region of North America". Bauu Institute. Archived from the original on 2009-12-15. Retrieved 2010-04-22.
  28. Morgan (1953, 1964), Jedediah Smith and the Opening of the West, p. 7
  29. Ogden, Peter Skene, Dictionary of Canadian Biography Online
  30. "Ceremony at "Wedding of the Rails," May 10, 1869 at Promontory Point, Utah". World Digital Library. 1869-05-10. Retrieved 2013-07-20.
  31. NPS contributors (2003). The National Parks Index (PDF). Washington, D.C.: National Park Service, U.S. Department of the Interior. p. 26. Archived from the original on 2008-12-19. Retrieved 2008-10-05.CS1 maint: BOT: original-url status unknown (link)
  32. Zarki, Joe. "A Park for Minerva". Joshua Tree National Park, NPS. Retrieved 17 December 2013.
  33. "Park History". Joshua Tree National Park, NPS. Retrieved 17 December 2013.
  34. "California Desert Protection Act". Joshua Tree National Park. U.S. National Park Service. Retrieved 2015-08-02.
  35. "Black Rock Desert-High Rock Canyon Emigrant Trails National Conservation Area Act of 2000" (PDF). Archived from the original (PDF) on 2004-11-08. Retrieved 25 July 2015.
  36. "Join Our Friends". Great Basin National Park. U.S. National Park Service. Retrieved 2015-08-02.
  37. "Amargosa River Natural Area". U.S. Bureau of Land Management. Archived from the original on 2016-03-01. Retrieved 2015-08-02.
  38. "Secretary Jewell Applauds President Obama's Designation of Basin and Range National Monument in Nevada". Bureau of Land Management News Release. U.S. Department of the Interior. Archived from the original on 2015-07-12. Retrieved 2015-07-11.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.