Results 171 to 180 of about 54,488 (217)

Geological reconnaissance in northern Sierra Madre Occidental of Mexico

Geological Society of America Bulletin, 1939
INTRODUCTION GENERAL STATEMENT The crests of the Sierra Madre Occidental, in the western part of Mexico, form the boundary between the west coast States of Sonora and Sinaloa and the interior States of Chihuahua and Durango. These plateau-like crests, carved from gently inclined volcanic rocks, are in contrast to the Sierra Madre Oriental, in eastern
openaire   +3 more sources

Post-Oligocene river incision, southern Sierra Madre Occidental, Mexico

Geomorphology, 2003
The Sierra Madre Occidental of western Mexico consists of a granitic basement covered by Oligocene ignimbrites that define a reference surface from which to estimate late Cenozoic river incision. A 90-m-grid digital elevation model was used to characterize contemporary topography and interpolate the Late Oligocene surface of the ignimbrite plateau from
David R. Montgomery, Jorge López-Blanco
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Calderas of the Sierra Madre Occidental Volcanic Field western Mexico

Journal of Geophysical Research: Solid Earth, 1984
Approximately 296,000 km2 of western Mexico is covered by a volcanic sequence that has an average thickness of 1 km and is mostly ash‐flow tuff. Although some 350 calderas are suggested by this tremendous volume, only a few have been located or described.
Eric R. Swanson, Fred W. McDowell
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Bioclimatic belts of Sierra Madre Occidental (Mexico):A preliminary approach

International Journal of Geobotanical Research, 2013
A bioclimatic synthesis of the Sierra Madre Occidental (SMO) based on the diagnosis of data from 159 meteorological stations, the floral and vegetation data collected in field surveys, and in the bibliographic revision. The considered area is above the altitude of 1800 m included in the physiographical province of SMO, which entirely belongs to ...
Joaquín Giménez de Azcárate   +2 more
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A new species of Ceanothus (Rhamnaceae) from Sierra Madre Occidental, Mexico

Phytotaxa, 2019
Ceanothus fernandezii is described as a new species in the subgenus Ceanothus from the Sierra Madre Occidental in the Mexican state of Durango. It differs from known species of Ceanothus for having rigid secondary branches with elliptic to ovate leaves with three veins at the base and a pubescent  lower surface, white flowers and smooth fruit ...
JOSÉ A. VILLARREAL-QUINTANILLA   +2 more
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Surface wave studies of the Sierra Madre Occidental of northern Mexico

Bulletin of the Seismological Society of America, 1999
AbstractSeismograms originating from earthquakes in the Gulf of California and recorded in West Texas (TXAR) were used to construct Rayleigh wave group velocity dispersion curves for propagation paths in northern Mexico. These paths were approximately orthogonal to boundaries of several different tectonic provinces including the Gulf of California, the
Jessie L. Bonner, Eugene T. Herrin
openaire   +1 more source

Evolution of waning, subduction-related magmatism, northern Sierra Madre Occidental, Mexico

Geological Society of America Bulletin, 1990
The stratigraphic record at the Tomochic volcanic center, Chihuahua, documents a change from andesitic to rhyolite-dominated volcanism, with late extrusion of mafic lavas, during the final ∼10 m.y. of subduction-related activity in the northern Sierra Madre Occidental.
D. A. WARK   +2 more
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Seasonal variation of mammal roadkill hotspots in the Sierra Madre Occidental, México

Therya Notes, 2022
Roadkill hotspots are spatially aggregated sites that are not distributed at random.  In the case of mammals, hotspots are used as a criterion to assess the locations of roadkill mitigation works, although these sites can vary at different time scales.
Rodolfo Cervantes-Huerta   +1 more
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Cunila socorroae (Lamiaceae) a new species from Sierra Madre Occidental, Durango, Mexico

Phytotaxa, 2020
Recent botanical explorations in Durango, Mexico, led to the discovery of a new species endemic to this state: Cunila socorroae (Lamiaceae), which is consequently here described and illustrated. The new species is morphologically most similar to C. jaliscana and C. lythrifolia.
MARÍA DEL ROSARIO GARCÍA-PEÑA   +1 more
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