Sierra Madre Occidental


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Sierra Madre Occidental

 

a mountain range in Mexico, along the western edge of the Meseta Central. The range is about 1,300 km long and 80–200 km wide. Average elevations vary between 1,500 and 2,000 m; the highest peak is Mount Chorreras (3,150 m).

The Sierra Madre Occidental is composed mainly of Precambrian metamorphic rocks with a mantle of younger sedimentary rocks and granite intrusions, overlain by thick layers of Neogene lavas. Gold and silver are mined in the mountains. The range is deeply dissected by river valleys; in the west there are canyons up to 200 m deep. In the northern part of the range, the slopes are covered mainly by xerophytic shrubs; at elevations of about 2,000 m they give way to thin, dry pine forest. In the southern part of the range there are sclerophyll and summer green forests.

References in periodicals archive ?
In contrast, there does seem to be an increase in ploidy levels from south to north, with a concentration of polyploids in the northern area of the Sierra Madre Occidental.
Los valores de estos parametros, no son menores a los generados para diversas especies de coniferas presentes en la Sierra Madre Occidental y en consecuencia no limitan la reconstruccion potencial de variables climaticas (Grissino-Mayer, 2001; Villanueva et al.
Geology and resources in Northern Sierra Madre Occidental, Mexico.
The Sierra Madre Occidental has produced an estimated 40 million oz of gold and 2 billion oz of silver since the time of the Spanish Conquest, but as the access to the area is difficult, there has been limited exploration," said Golden Goliath's CEO, J.
Between the delta of the Colorado River and the southern tip of the Sierra Madre Occidental is the Northwestern Coastal Plain Physiographic Province, a wide lowland area, characterized by extensive intermountain plains occupying the western one-half of Sonora, and gradually narrowing to a belt 40-60 km wide throughout the length of Sinaloa.
ornatus, en el Sistema Volcanico Transversal, el sur de la Sierra Madre Oriental y la Sierra Madre Occidental (Fig.
Las Barrancas del Cobre, es una zona de grandes depresiones en relieve dentro de la Sierra Madre Occidental, esto le da una singularidad tanto en aspectos fisicos como biologicos, por lo que su importancia es resaltada a nivel mundial.
THE QUIET MOUNTAINS: A Ten-Year Search for the Last Wild Trout of Mexico's Sierra Madre Occidental
Its range is thought to be centered in the northern Sierra Madre Occidental of Mexico, but the eastern and southern distributional limits are not clear.
A TEAM OF SCIENTISTS from both sides of the border will name two new species of trout found in the Sierra Madre Occidental Mountains in northern Mexico.
Fifty-year-old Philip True, who was raised in the San Fernando Valley, was strangled with a neckerchief several days before Mexican soldiers recovered his body from a 330-foot ravine Wednesday in the remote Sierra Madre Occidental.
No article is complete without mention of the 76 years it took to build the 400-mile rail route joining the canyon country to Los Mochis and Chihuahua, or without reference to the Tarahumara Indians who still inhabit this rugged part of the Sierra Madre Occidental.