Sierra Madre Occidental


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The population's status of the Sierra Madre Sparrow of the Sierra Madre Occidental is so critical that it does not resist making more mistakes.
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.
Beautiful natural landmarks include Copper Canyon, which consists of six canyons in Sierra Madre Occidental in the southwestern part of Chihuahua.
The Chihuahuan Desert is a desert that straddles the U.S.-Mexico border in the central and northern portions of the Mexican Plateau, bordered on the west by the extensive Sierra Madre Occidental range, and overlaying northern portions of the east range, the Sierra Madre Oriental.
The Company is exploring in the mineralised Sierra Madre Occidental mining province in northern Mexico, and is focusing its activities to other mining districts in northern Mexico.
The study area lies west of two of the largest mountain systems of continental Mexico, the Sierra Madre Occidental and the Sierra Madre del Sur.
Las Provincias Biogeograficas Neotropicales consideradas son BAL: Depresion del Balsas, CHI: Chiapas, MPA: Costa del Pacifico, MGU: Costa del Golfo, SME: Sierra Madre Oriental, SMO: Sierra Madre Occidental, SMS: Sierra Madre del Sur, VOL: Eje Volcanico Transmexicano, YUC: Peninsula de Yucatan.
True was murdered in December 1998 while on a solo-backpacking trip in the Sierra Madre Occidental.