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
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
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.
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