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Topic: Basin and Range Province

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		The basin depth model provides a synoptic view of the subsidence patterns of Cenozoic extension; in detail, however, the depths shown on the maps are dependent on the simple density--depth functions used for Cenozoic sedimentary and volcanic rocks.
		In addition, the stability of the separation of basin and basement gravity is dependent on the good correlation of basin gravity anomalies with the mapped area of the basins and the tendency of the basins to have shallow flanks.
		BASIN DEPTH MODEL The depth-to-basement map (fl lines on map B, colors on map C) is an inversion of the gravity data using the simple density-depth functions given in table 1 and using constraints from surface geology.
	www.ngdc.noaa.gov /seg/cdroms/grav99v1/data/grids/basinrng/readme.txt (4916 words)

	Chapter 39-Ecological Subregions of the United States
		The Basin and Range Section is a physiographically diverse area characterized by expansive playas and open grassland basins cut by steep, rugged mountain, mesa, and canyon terrain.
		Basin and range deserts were widely used for wild plant procurement, agriculture, and settlement.
		Precipitation ranges from 8 to 13 in (200 to 320 mm).
	www.fs.fed.us /land/pubs/ecoregions/ch39.html (1187 words)

	Automated IFSAR Terrain Analysis System - Leighty and Assoc., Inc.
		It is bordered by the Sierra Nevada range on the west, the Wasatch Mountains on the east, the Columbia Plateau on the north, and the Mojave Desert on the south.
		These are: A, The Central Area elevated basins and ranges; B, The Bonneville Basin east of the central area; C, The Lahontan Basin west of the central area; D, The Lava and Lake Area at the northwest corner of the section; and E, The Southern Area.
		Gillem's Bluff, a prominent Basin and Range fault scarp, is located to the east of "B" that shows as a ridge on the contour map having a bluff on the east side that extends towards the center of the Medicine Lake volcano.
	www.tec.army.mil /publications/ifsar/lafinal08_01/five/5.1.6.htm (5458 words)

	Basin and Range Summary
		Basin and range topography is characterized by tilted fault blocks forming sub-parallel mountain ranges and intervening sediment-filled basins.
		This province is bounded on the east by the Colorado Plateau, the Columbia and Snake River Plateaus to the north, the Sierra Nevada to the west, and extends southward through eastern California and southern Arizona into northern Mexico.
		Within the basin and range province, steep mountain ranges are bounded by normal faults, with ground motion along the faults resulting in the relative uplift of the mountains and dropping of the valleys.
	www.bookrags.com /Basin_and_Range (1228 words)

	Basin and Range - Wikipedia, the free encyclopedia
		The Basin and Range Province is a particular type of topography that covers much of the southwestern United States and northwestern Mexico that is typified by elongate north-south trending arid valleys bounded by mountain ranges which also bound adjacent valleys.
		Basin and Range topography also dominates large parts of the Mexican states of Sonora, Chihuahua, and Baja California.
		Along the roughly north-south-trending faults mountains were uplifted and valleys down-dropped, producing the distinctive alternating pattern of linear mountain ranges and valleys of the Basin and Range province.
	en.wikipedia.org /wiki/Basin_and_Range_Province (803 words)

	THE BASIN AND RANGE REGION
		In sheltered slopes and valleys are clusters of spruce, subalpine and Douglas fir, limber pine, and aspen.
		Each of the mountain ranges in Utah's Basin and Range Province is an isolated ecosystem, a biological island surrounded by desert playas, where many unique species have evolved or survive as relicts after separation from a larger historic range.
		Both bighorn and antelope, native to the Basin and Range country, were nearly extirpated from the region by overgrazing by livestock, poaching, predation, and habitat destruction (BLM, 1988; Durrant, 1952).
	www.suwa.org /WATE/basinintro.html (2254 words)

	Geologic Framework of
		The Basin and Range Province is characterized by numerous mountain ranges that rise abruptly from broad, plain-like valleys or basins.
		Surfaces that extend from basin centers to mountain fronts may appear to be quite flat, but actually rise steadily and with increasing steepness from the axial trough toward the mountains where they may have slopes of 8 or 9 degrees (Fenneman, 1931).
		The term piedmont slope is used to describe that part of the intermontane basin that comprises all of the constructional and erosional, major and component landforms from the basin floor to the mountain front and on into alluvium-filled mountain valleys.
	southwest.library.arizona.edu /azso/body.1_div.2.html (10043 words)

	Friends of Saguaro National Park - About Saguaro National Park: Geologic Provinces of the Southwest Region (Site not responding. Last check: 2007-10-20)
		Within Arizona, the area between the Colorado Plateau and the Basin and Range is sometimes considered as a separate province called the Central Highlands or the Transition Zone.
		Northwest-trending mountain ranges, separated by intervening basins are characteristic of the Basin and Range province.
		Sometimes considered as a separate province, the Arizona Central Highlands, or the Transition Zone, separates the Colorado Plateau to the north from the Basin and Range to the south.
	www.friendsofsaguaro.org /geoprovs.html (702 words)

	USGS Geology in the Parks
		The Basin and Range province has a characteristic topography that is familiar to anyone who is lucky enough to venture across it.
		Aerial view of linear valleys and mountain ranges that characterize the Basin and Range Province.
		Within the Basin and Range Province, the Earth's crust (and upper mantle) has been stretched up to 100% of its original width.
	wrgis.wr.usgs.gov /docs/parks/province/basinrange.html (648 words)

	Geology of the South Snake Range and Great Basin National Park (Site not responding. Last check: 2007-10-20)
		The "Great Basin" that Great Basin National Park is named after extends from the Sierra Nevada Range in California to the Wasatch Range in Utah, and from southern Oregon to southern Nevada.
		The landscape around Great Basin National Park is a good example of what is found throughout the Basin and Range province - long mountain ranges separated by equally long, flat valleys.
		The bulk of the rocks exposed in this range are formed of sediments like sand, mud and limey ooze (silt and clay particles mixed with calcium carbonate) that were laid down on the bottom of a shallow sea during the late Precambrian and Cambrian (around 560 million years ago).
	www.nps.gov /grba/parkgeology.htm (927 words)

	Rio Grande Rift
		The lineaments that connected the ends of staggered basins were subjected to "scissor-like" torque in the near surface rocks and to a transverse shear at depth, and these deeply-penetrating transverse structures have tended to leak magma and to be zones of high heat flow and geothermal activity (Chapin, 1979).
		The basin is bounded by the Sangre de Cristo Mountains to the east, and the Precambrian-cored Nacimiento uplift to the west (Manley, 1979).
		The basin is tilted to the east in New Mexico, with major tectonic uplift along the eastern margin with the Sangre de Cristo Mountains.
	www.emporia.edu /earthsci/student/tilton4/rgrift.html (1380 words)

	GEO_PLATE_T-4 (Site not responding. Last check: 2007-10-20)
		Elongate, generally north-trending, fault-bounded high mountain ranges and intervening dry, alluvium-filled, flat-floored valleys characterize the Great Basin or Basin and Range Province, which C. Dutton described as giving the appearance of "numerous caterpillars crawling toward Mexico" to a map of the region.
		Because of the recent tectonic activity that produced the fault-bounded ranges and valleys and the general aridity of the region, almost all of the drainage is internal.
		On the west, the steep range front is being covered with debris that is now being trenched, with the material removed into the center of the basin.
	disc.gsfc.nasa.gov /geomorphology/GEO_2/GEO_PLATE_T-4.HTML (814 words)

	Geologic Maps
		Scattered orange units in the Basin and Range Province in the distance are volcanic rocks that were erupted when that region extended.
		The pink units are older volcanic and plutonic rocks from a very early phase of the Cascade volcanism, or, in the Basin and Range, reflect early magmatism during initial extension of that province.
		To the south, in the California Coast Ranges and the Sierra Nevada, the green units are an early phase of the extensive Mesozoic batholiths that formed during subduction off the western margin of North America.
	www.geology.wisc.edu /~g109/Geology/Geologic_Maps/usa_geology.htm (1518 words)

	How was Utah's topography formed? - Utah Geological Survey
		The three provinces meet near the center of the state, with the Basin and Range Province extending across western Utah, the Colorado Plateau across southeastern Utah, and the Middle Rocky Mountains across northeastern Utah.
		The ranges started taking shape when the previously deformed Precambrian (over 570 million years old) and Paleozoic (570 to 240 million years old) rocks were slowly uplifted and broken into huge fault blocks by extensional stresses that continue to stretch the earth’s crust.
		In contrast with the Basin and Range Province, a thick se- quence of largely undeformed, nearly flat-lying sedimentary rocks characterize the Colorado Plateau province.
	geology.utah.gov /surveynotes/gladasked/gladtopoform.htm (843 words)

	Volcanoes of the Eastern Sierra Nevada
		The Basin and Range Province is located in the western United States, and includes approximately 800,000 km² of area extending from southern Oregon and Idaho through most of Nevada, and parts of California, Arizona, Utah, and New Mexico to northern Mexico (Eaton, 1982).
		The average elevation of the Basin and Range Province is approximately 1400m; however the eastern and western boundaries are characterized by lower elevations (Ellis et al., 1999).
		High heat flow in the Basin and Range province indicates the presence of hotter, less dense material close to the surface and thus implies that mantle upwelling is occurring.
	www.indiana.edu /~sierra/papers/2005/coulter.html (2381 words)

	Gans and Miller 1993
		The Basin and Range province of the western U. is widely recognized as a classic example of extended continental crust, yet the ultimate cause(s) of this extension remain controversial.
		A growing body of data suggests that a significant proportion of the extension in the Basin and Range province, including the extensional unroofing of many of the metamorphic core complexes and inception of the present basin-range physiography took place during a relatively short time interval in the mid-Miocene (~20 to 10 Ma).
		Thus, extension of the Basin and Range province is probably a poor example of Òlate orogenic extensionÓ.
	www.geol.ucsb.edu /faculty/gans/abstracts/gans1993.html (722 words)

	Events - Western States Seismic Policy Council
		The goal of the Basin and Range Province Seismic Hazards Summit is to evaluate approaches and techniques or seismic hazard characterization in extensional regions.
		The Basin and Range province of North America is a land of contrasts and challenges for seismic hazard analysis and application.
		The province's population setting that is at risk from these potential earthquakes can be described as both rural and urban, with most of the population living in cities.
	www.wsspc.org /Events/brpshs.html (437 words)

	Death Valley, s01
		Death Valley is in the Basin and Range province of California.
		The recent extensional tectonic setting of the Basin and Range has given it the geomorphology of mountain ranges and basins that extend from east of the Sierra Nevada to the base of the Wasatch Range in Utah.
		The Panamint Range to the west of the valley forms part of a tilted block, sliding on a detachment fault.
	instruct.westvalley.edu /lopez/trips/death_valley/dv_s01.html (725 words)

	USGS Earthquake Hazards Program » Paleoseismic Studies in the Basin and Range Province, Northern Nevada (via ... (Site not responding. Last check: 2007-10-20)
		The Basin and Range province is a large region of extensional tectonics in the Intermountain western United States that is marked by numerous north-trending mountain ranges and adjacent basins, which formed primarily by normal faulting in late Tertiary and Quaternary time.
		The Santa Rosa Range is a prominent mountain range in northwestern Nevada and southeastern Oregon.
		Recent geodetic data from the northern part of the Basin and Range province in northwestern Nevada, northeastern California, and southern Oregon define a narrow zone of relatively high extension that coincides with the Steens fault zone, which bounds the eastern side of Steens Mountain and the Pueblo Mountains.
	earthquake.usgs.gov.cob-web.org:8888 /regional/imw/imw_sfp (1009 words)

	Utah History Encyclopedia
		It is a region of interior drainage bounded prominently on the west by the Sierra Nevada and the Cascade Range and on the east by the middle Rocky Mountains and the Colorado Plateau.
		In terms of geological plate tectonics, the Great Basin may be viewed as a series of north-south trending, linear, fault-block mountain ranges occupying the distance between the Sierra crest and the Wasatch Front.
		Interior basins are commonly around 4,000 to 5,000 feet above sea level and ranges as high as 10,000 (and occasionally 12,000 feet) in elevation.
	www.media.utah.edu /UHE/g/GREATBASIN.html (1458 words)

	Utah Habitat: Basin and Range Province
		The Wasatch Range represents the westernmost extension of the Rocky Mountains whereas the Oquirrh Mountains and Lake Mountains represent the eastern extension of the Great Basin or Basin and Range Province.
		This is evident in many butterfly families including the family Pieridae (Whites, Sulphurs, and Orangetips.) For example, Spring Whites and Orange-tips fly in both the Wasatch Front and in the Basin and Range Province.
		The Wasatch Front variety is Euphydryas anicia maria whereas the Basin and Range subspecies is Euphydryas anicia wheeleri.
	www.utahlepsociety.org /basinrange.html (325 words)

	Policy Recommendations - Western States Seismic Policy Council
		The Basin and Range Province is a large extensional tectonic domain with thousands of normal-slip and strike-slip Quaternary faults that appear to be involved in contemporary deformation.
		An example of the latter is found in areas of the Basin and Range Province where pervasive latest Pleistocene pluvial lake or glacial deposits make use of a Holocene criterion straightforward and practical, but use of a late Quaternary criterion where faults of that age are deeply buried would be impractical.
		WSSPC recommends the Basin and Range Province Earthquake Working Group discuss the application of these active fault definitions at their planned 2006 meeting(s) to determine whether consensus can be reached regarding appropriate active fault definitions in the Basin and Range Province for various facility types.
	www.wsspc.org /PublicPolicy/PolicyRecs/2005/policy052.html (1812 words)

	Holocenes Basin and Range gallery
		The province is characterized by tilted fault blocks, raising the ranges and leaving deep valleys between blocks.
		Many valleys have no streams exiting them, and their basins accumulate salt and sediment from the infrequent storms that leave shallow lakes to evaporate in the sun.
		The lightly populated, isolated desert regions of the Basin and Range provide space for military reservations such as the China Lake Naval Weapons Center and the Nellis Range in Nevada.
	www.holoscenes.com /gallery2.html (219 words)

	Center for Energy and Economic Diversification (CEED) / Basin and Range Province
		El Capitan and Guadalupe Peak are the centerpieces of the Capitan reef which rims the western margin of the Delaware Basin.
		From a playa in the Salt Basin one can view a spectacular cross-section of the Guadalupe Mountains illustrating the reef/fore-reef relationships during the Permian geological period.
		Salt Basin is the beginning of the Basin and Range Province in Texas.
	www.utpb.edu /ceed/GeologicalResources/West_Texas_Geology/Links/basin_range.htm (172 words)

	Extension in the Basin and Range Province
		Some compensating deformation of the hanging wall would be required; in fact, almost all hanging walls seen in the Basin and Range province are extensively fractured and faulted.
		An important new idea which has arisen in the last four years is that the lower crust of the Basin and Range province should behave as a viscous fluid, flowing in to fill the voids that extreme extension would otherwise form.
		In fact, observed variations of crustal thickness at the edge of the Basin/Range province are much less than they would be in balanced cross-sections, implying either lateral extrusion or massive intrusion; McCarthy and Parsons [1994] use seismic data to limit the amount of intrusion.
	www.agu.org /revgeophys/bird01/node4.html (491 words)

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