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Topic: Sierra Madre Occidental

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Sierra Madre del Sur

Sierra Madre Oriental

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	Sierra Madre - HighBeam Encyclopedia (Site not responding. Last check: 2007-10-18)
		Sierra Madre, chief mountain system of Mexico, consisting of the Sierra Madre Oriental, the Sierra Madre Occidental, and the Sierra Madre del Sur and forming the dissected edges of the vast central Mexican plateau; a volcanic belt along the plateau's southern edge links the three sierras.
		The Sierra Madre Oriental, beginning in barren hills S of the Rio Grande, runs for c.700 mi (1,130 km) roughly parallel to the coast of the Gulf of Mexico, ranging from 10 to 200 mi (16-320 km) inland.
		The Sierra Madre del Sur is a tumbled, broken mass of uptilted mountains that touch the Pacific coast but form into no clearly defined range.
	www.encyclopedia.com /doc/1E1-sierm1adm1ts.html (539 words)

	Mexico - Topography and Drainage
		The Sierra Madre Occidental on the west is a continuation of California's Sierra Nevada (with a break in southeastern California and extreme northern Mexico), and the Sierra Madre Oriental on the east is a southward extension of the Rocky Mountains of New Mexico and Texas.
		The Sierra Madre Occidental lies approximately 300 kilometers inland from the west coast of Mexico at its northern end but approaches to within fifty kilometers of the coast near the Cordillera Neovolcánica.
		As is the case with the Sierra Madre Occidental, the Sierra Madre Oriental comes progressively closer to the coastline as it approaches its southern terminus, reaching to within seventy-five kilometers of the Gulf of Mexico.
	countrystudies.us /mexico/48.htm (1002 words)

	Highbeam Encyclopedia - Search Results for Occidental
		Dominated by the mountains of the Sierra Madre Occidental and the volcanic chain of central Mexico, Michoacán extends from the Pacific Ocean northeastward into the central plateau.
		Mostly wild and rugged, Nayarit is broken by western spurs of the Sierra Madre Occidental.
		Jalisco is dominated by the southern end of the Sierra Madre Occidental and the western extremity of the chain of volcanic mountains extending
	www.encyclopedia.com /SearchResults.aspx?Q=Occidental&StartAt=11 (509 words)

	Hotspots Revisited
		The Sierra Madre del Sur, which runs parallel to the Pacific Coast of Guerrero, is the most geologically complex, with pre-Cambrian units, volcanoes from the Mesozoic, and formations from the Middle Tertiary related to the Sierra Madre Occidental.
		Likewise, in the Sierra Madre Occidental, the western sides generally receive more rainfall and have a milder winter, although as a whole, the entire mountain range is considered to have mild winters and wet summers (Brown 1994), with mean annual rainfall around 550 mm (mostly falling in August).
		In the Sierra Madre del Sur, oak forests grow at 1 900–2 500 m, cloud forests at 2 300 m, and pine-oak and pine forests at elevations between 2 400 and 2 500 m.
	www.biodiversityscience.org /publications/hotspots/MadreanPineOakWoodlands.html (4378 words)

	CPD: Middle America, Site MA11, Apachian/Madrean Region of South-Western North America, Mexico, U.S.A.
		The Madrean district is characterized by the cordilleran flora between the Sierra Mohinora in the State of Chihuahua near the Sinaloa-Durango border and the northernmost edge of the Sierra Madre Occidental proper, c.
		The flora of the Sierra de los Ajos is estimated at 1000 species (Fishbein, Felger and Garza 1995), and White (1949) documented 1200 species and infraspecific taxa for the Sierra del Tigre and Río Bavispe region in north-eastern Sonora.
		At Nabogame (near Sierra Mohinora) in Chihuahua, the northernmost population of "teosinte" is disjunct by several hundred km from the tropical range of these wild and weedy maize relatives, where they sometimes introgress with cultivated maize (Doebley and Nabhan 1989).
	www.nmnh.si.edu /botany/projects/cpd/ma/ma11.htm (6122 words)

	Biodiversity Hotspots - Madrean Pine-Oak Woodlands - Conservation Action (Site not responding. Last check: 2007-10-18)
		Most of the endemic terrestrial vertebrate species in Mexico that are still unprotected are located on the southern slopes of the Sierra Madre del Sur and, to a lesser extent, on the western slopes of the Sierra Madre Occidental and the eastern slopes of the Sierra Madre Oriental, making this hotspot an important conservation priority.
		In the Sierra Madre Occidental, the 48-km² Cumbres de Majalca National Park, the 58-km² Cascada de Basaseachic National Park and the 93-km² La Michilía Biosphere Reserve conserve notable stands of pine-oak formations.
		The Sierra Madre Alliance, a network of Mexican and international partners working in the Sierra Madre Occidental in Chihuahua, aims to preserve biodiversity and restore the functioning of forested ecosystems through local participation.
	www.conservation.org /xp/Hotspots/pine_oak/conservation.xml (555 words)

	Highbeam Encyclopedia - Search Results for Occidental
		Sierra Madre SIERRA MADRE [Sierra Madre], chief mountain system of Mexico, consisting of the Sierra Madre Oriental, the Sierra Madre Occidental, and the Sierra Madre del Sur and forming the dissected edges of the vast central Mexican plateau; a volcanic belt along the plateau's southern edge links the three
		Nazas NAZAS [Nazas], river, c.180 mi (290 km) long, rising in the Sierra Madre Occidental, Durango state, N Mexico, and flowing generally east to disappear into the ground near Torreón.
		About 60,000 strong, they live for the most part in the barren wilderness of the Sierra Madre Occidental, subsisting largely by hunting and practicing rudimentary agriculture.
	www.encyclopedia.com /SearchResults.aspx?Q=Occidental&StartAt=11 (566 words)

	Cooperative Conservation (Site not responding. Last check: 2007-10-18)
		Within northwestern Mexico, the northern Sierra Madre Occidental and the adjacent lowlands of Chihuahua and Sonora are of especial significance and concern.
		Furthermore, the wooded slopes of the Sierra Madre are the headwaters of several rivers that are key water sources for the more populated lowlands.
		The Sierra Madre is one of the last strongholds of large carnivores in Mexico, and a prime candidate for the reintroduction of Mexican wolves.
	www.skyislandalliance.org /Cooperative.htm (1901 words)

	[No title]
		of pine-oak habitat in the Sierra Madre Occidental, 571 km
		in the Sierra Madre Occidental and 9,860 km
		Sierra Tabaco holds the only old-growth pine-oak forest in the wide surroundings, although mature (not primary) pine forest had been cut in the range south of El Macho (at 29°46'32" N 108°47'12" W), approximately 30 km to the south-west, in 1993.
	www.worldwildlife.org /bsp/publications/lac/status/status1.html (18646 words)

	Ignimbrite flare-up and deformation in the southern Sierra Madre Occidental, western Mexico: Implications for the late ...
		The Sierra Madre Occidental (SMO) of western Mexico is one of the largest silicic volcanic provinces on Earth, but the mechanism for the generation of such a large volume of ignimbrites has never been clearly defined.
		Ar ages, geologic mapping, and structural data for the southern part of the SMO demonstrating that most of this volcanic province was built in two episodes of ignimbrite flare-up in Oligocene (31.5–28 Ma) and early Miocene (23.5–20 Ma) time, and that extensional deformation occurred mostly before the transfer of Baja California to the Pacific plate.
		Transpression at the southernmost end of the SMO occurred along the inland projection of the Magdalena-Cocos plate boundary and may be explained by a difference in subduction rate and by a temporal convergence between the two plates in the eve of the end of subduction of the Magdalena plate.
	www.agu.org /pubs/crossref/2002/2001TC001302.shtml (469 words)

	The Sierra Tarahumara Diversity Project
		The Sierra Tarahumara, a major component of Mexico’s northern Sierra Madre Occidental, is a spectacular region of high sierras and deep canyons extending for nearly 1000 kilometers from just south of the United States border through the northern Mexican states of Chihuahua, Sonora, Durango, and Sinaloa.
		The members of the Indigenous societies in the Sierra Tarahumara are subsistence agriculturalists but they also depend upon a wide array of local plant and animal species for their survival.
		Sierra residents are seeing their livelihoods under threat, and rapid change is also endangering their traditional knowledge, the languages that are the vehicles of this knowledge, and the cultural traditions that sustain their identity.
	www.mexnor.org /stdpcon.htm (1658 words)

	Stingray Resources Inc. (Site not responding. Last check: 2007-10-18)
		Mexico is characterized by an extraordinary diversity in topography and climate and is crossed by two major mountain chains, the Sierra Madre Occidental and the Sierra Madre Oriental.
		These precious metal deposits occur all along the length of the Sierra Madre Occidental, in a marked northwest - southeast trend, and are often related to volcanic calderas, which are common throughout the belt (Swanson and McDowell, 1984).
		The property is located along the western flank of the Sierra Madre Occidental in steep mountainous terrain characterized principally by an extensive sequence of volcanic rocks.
	www.stingrayresources.com /Mexico.htm (522 words)

	Mexican Deforestation in the Sierra Madre
		Nearly twenty percent of the timber logged in the Sierra Madre is sold to the U.S. as plywood, paper, or pulp.
		The first opium and marijuana seeds were brought to the Sierra Madre Occidental in the 1930s by Chinese traders who saw the potential for growing plants in the large, unpatrollable area (Weisman 1994, 10).
		In many areas of the Sierra Madre there are opium plants surrounded by strands of barb wire in clearings of downed trees that have either been burned or logged.
	gurukul.ucc.american.edu /ted/MEXDEFOR.HTM (3342 words)

	Sierra Madre Alliance: Nature, Culture and Economy in Balance
		The forests of the Sierra Madre Occidental and the people who live there have undergone a long history of exploitation with no end in sight.
		In this section, we present “The Political Ecology of Deforestation in the Sierra Madre Occidental of Chihuahua,”; by Randall Gingrich, Executive Director of Sierra Madre Alliance.
		This testimony documents the experience of the Sierra Madre Program in promoting community development and conservation in the Sierra and illustrates the important role played by nongovernmental organizations in bridging the gap between government agencies and communities in recipient nations.
	www.sierramadrealliance.org /sierra-pol-ecol/political-ecology.shtml (238 words)

	Sierra Madre Alliance: Nature, Culture and Economy in Balance
		Sierra Madre Alliance supports a network of Mexican and international partners in pursuing Bio-Cultural Conservation priority goals in the Sierra Madre Occidental of Chihuahua.
		Restoration of watersheds and riparian areas of the Sierra and protection of remaining remnants of old-growth forest are the primary goals of the Sierra Madre Alliance Conservation Program, which is supporting micro-watershed (usually less than 10,000 hectares per community) restoration efforts in various communities in the Conchos, Sinforosa and Papigochi watersheds.
		At the heart of the Sierra Tarahumara is the community of Choreachi, the last Tarahumara community to live in an ancient forest.
	www.sierramadrealliance.org /conservation/conservation.shtml (623 words)

	Tour By Mexico ® - Chihuahua State --- 4
		It is divided in two huge natural areas: The North Central plateau region and the Sierra Madre Occidental region.
		On the western area is mountain extreme and sub-humid that vary depending on the elevation.
		At the basis of the Sierra Madre is semidry.
	www.tourbymexico.com /chihua/chihua.htm (209 words)

	Madre
		These influences probably enabled northward movement of Sierra Madrean animals and southward dispersal of Rocky Mountains-Great Plains species which were adapted to the cooler climate at higher altitudes and latitudes.
		The probable cause of its demise in Arizona is exposure to toxic metals leached from rock and soil by acid rain caused by copper smelter effluents, particularly sulfur dioxide.
		The most unusual salamander in the Sonoran Desert region is found in the Sierra Madre of Sonora, near Yecora.
	www.biopark.org /madre.html (2717 words)

	Sierra Madre Occidental - Peakware World Mountain Encyclcopedia
		Sierra Madre Occidental is a range in Mexico 300 miles wide that runs parallel with the Gulf of California and the Pacific Ocean.
		Its average elevation is 10,000 feet, and its mountains are generally steeper and more rugged than those of the Sierra Madre Oriental, which parallels the Gulf of Mexico.
		Many peaks of the Occidental range have some snow cover, and most are volcanic.
	www.peakware.com /areas.html?a=365 (126 words)

	Terrestrial Ecoregions -- Sierra Madre Occidental pine-oak forests (NA0302)
		The Sierra Madre Occidental Mountains extend from west-central Mexico northwards, gradually becoming isolated peaks surrounded by the Sonoran and Chihuahuan Deserts in southern Arizona.
		The Sierra Madre Occidental pine oak forests are rich in endemic and endangered plant and animal species.
		The Mexican wolf, American fl bear, and jaguar once roamed large sections of the Sierra Madre Occidentals, but their ranges and populations have severely declined.
	www.nationalgeographic.com /wildworld/profiles/terrestrial/na/na0302.html (519 words)

	Sierra Madre
		The Realm of the Rattlesnake ventures deep into Mexico's rugged "western mother mountains", the Sierra Madre Occidental.
		The vast Mexican plateau is flanked on the west by the Sierra Madre Occidental, on the east by the Sierra Madre Oriental, and to the south by the Sierra Madre Sur.
		Along the western slope of the Sierra Madre Occidental the climate is generally somewhat wetter, with presumably milder winter temperatures, resulting in a more diverse flora with more tropical elements including Apache pine (Pinus engelmannii), Durango pine (P.
	www.biopark.org /sierramadre.html (1144 words)

	Sierra Madre Occidental - Wikipedia, the free encyclopedia
		This picture shows an aerial view of the Sierra Madre Occidental crossing the territory of Durango, western Mexico
		The range is home to the Sierra Madre Occidental pine-oak forests, noted for their high biodiversity and large number of endemic species.
		Sierra Madre Occidental pine-oak woodlands (World Wildlife Fund)
	en.wikipedia.org /wiki/Sierra_Madre_Occidental (183 words)

	mts (Site not responding. Last check: 2007-10-18)
		The Sierra Madre comprises three major chains: the Sierra Madre Occidental in the west, the Sierra Madre Oriental in the east, and the Sierra Madre del Sur, which extends along the southern coast.
		The Sierra Madre Occidental stretch south-southeast from the United States border, extending more than 1100 km (700 mi.) along the western coast of Mexico toward Guadalajara.
		Mazatlán is on the coastal flank and Durango is on the eastern margin of the central range.
	members.aol.com /jdg256/mts.htm (339 words)

	Terrestrial Ecoregions -- Sierra Madre Occidental pine-oak forests (NA0302)
		This ecoregion occurs along the Sierra Madre Occidental, a rugged mountain range running from Rio Grande de Santiago, in the state of Jalisco, Mexico, north through the Mexican states of Sonora and Chihuahua, and into southern Texas and the Madrean Sky Islands of coniferous forests.
		Isolated from warmer environments by geological processes that produced the second largest mountain range in Mexico, the Sierra Madre Occidental pine-oak forests are characterized by a distinctive biota, and richness in endemic species.
		These montane pine and oak forests of the Sierra Madre Occidental occur along ridge tops, high valleys, and isolated peaks and slopes in a patchwork distribution from the southern United States (Madrean Sky islands of Arizona) to central Mexico (Jalisco) and are host to a number of endemic species (see description above for details).
	www.worldwildlife.org /wildworld/profiles/terrestrial/na/na0302_full.html (2480 words)

	articulos
		ABSTRACT: The study area is at the juncture of the Sierra Madre Occidental and Mexican Volcanic Belt centered on the Rio Grande de Santiago, l0 km northwest of Guadalajara.
		The lava flows of the top of the Sierra Las Flores, together with the distribution of basaltic activity north of this sierra, suggests that this intrusive body continues for 20 km along a NNW-trending strike.
		Between the sierras Las Flores and Las Animas, a 0.5-km-wide, 300-m-thick intrusive body is interpreted at a depth of about 100 m.
	geologia.cicese.mx /ldelgado/articulos.html (9208 words)

	Puerto Vallarta Ecotours - Sierra Madre Ecology and Wildlife
		The Sierra Madre Occidental region also sports some of the richest biodiversity found anywhere in North America, boasting a wide range of wildlife species including white-tailed deer, jaguar, pumas, wild boars, ocelots, jaguarundi, coati mundi, skunks, badgers, coyotes, margays, rabbits, armadillos and iguanas.
		Named for the bright yellow feathers that adorn their brilliant fl bodies, Yellow-winged Cacique build bag-like nests that are up to 30 inches long, which can be seen in the middle or the upper parts of the trees.
		The Black-Throated Magpie Jay (Calocitta colliei) with its long tail and raucous cry is a conspicuous bird in tropical deciduous forests of the Sierra Madre.
	www.vallarta-adventures.com /jeep-safari/ecology.html (1587 words)

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