Results 181 to 190 of about 53,865 (214)
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Cretaceous and Tertiary terrane accretion in the Cordillera Occidental of the Andes of Ecuador
Tectonophysics, 2002New field, geochronological, geochemical and biostratigraphical data indicate that the central and northern parts of the Cordillera Occidental of the Andes of Ecuador comprise two terranes. The older (Pallatanga) terrane consists of an early to late (?) Cretaceous oceanic plateau suite, late Cretaceous marine turbidites derived from an unknown basaltic
Hughes, Richard, Pilatasig, L.
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Applied Geochemistry, 2000
Abstract A regional geochemical reconnaissance survey of the Cordillera Occidental of Ecuador was initiated in 1995 as a sub-component of a wider Mining Development and Environmental Control Technical Assistance Project (PRODEMINCA) in Ecuador. The 36,000 km2 survey area encompasses oceanic and continental-margin volcano-sedimentary terranes with ...
T.Martin Williams +7 more
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Abstract A regional geochemical reconnaissance survey of the Cordillera Occidental of Ecuador was initiated in 1995 as a sub-component of a wider Mining Development and Environmental Control Technical Assistance Project (PRODEMINCA) in Ecuador. The 36,000 km2 survey area encompasses oceanic and continental-margin volcano-sedimentary terranes with ...
T.Martin Williams +7 more
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Journal of Herpetology, 1998
-Three species of Colostethus were found at 1800 m in the cloud forest of the Pacific slopes of the Cordillera Occidental of Colombia, including C. abditaurantius, C. fraterdanieli, and a new species. Sonagrams are given for all three species. Chromatic sexual dimorphism in C. abditaurantius is described.
Taran Grant, Fernando Castro
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-Three species of Colostethus were found at 1800 m in the cloud forest of the Pacific slopes of the Cordillera Occidental of Colombia, including C. abditaurantius, C. fraterdanieli, and a new species. Sonagrams are given for all three species. Chromatic sexual dimorphism in C. abditaurantius is described.
Taran Grant, Fernando Castro
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Cenozoic polyphase landscape and tectonic evolution of the Cordillera Occidental, southernmost Peru
Bulletin of the Geological Society of America, 1984Landforms on the Pacific slope of the Cordillera Occidental (Western Cordillera) in southernmost Peru reflect the episodic epeirogenic uplift of the Central Andes since the earliest Miocene. In the geomorphic history, three major stages are distinguished.
Richard M Tosdal +2 more
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Petrogenetic and Metallogenetic Relationships in the Eastern Cordillera Occidental of Central Peru
Journal of Geology, 2009Abstract Ore deposits spatially and temporally related to high‐K calc‐alkaline intrusions or domes are widespread in the central Peruvian Cordillera Occidental. Geochronology and petrochemistry of intrusive rocks associated with mineralization reveal that most ore deposits (1) were emplaced in the late Middle to early late Miocene and (2) are related ...
Thomas Bissig, Richard M Tosdal
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Journal of Volcanology and Geothermal Research, 1981
Abstract Twenty-four K-Ar radiometric ages are presented for late Cenozoic continental volcanic rocks of the Cordillera Occidental of southernmost Peru (lat. 16° 57′–17° 36′S). Rhyodacitic ignimbrite eruptions began in this transect during the Late Oligocene and continued episodically through the Miocene.
Richard M Tosdal +2 more
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Abstract Twenty-four K-Ar radiometric ages are presented for late Cenozoic continental volcanic rocks of the Cordillera Occidental of southernmost Peru (lat. 16° 57′–17° 36′S). Rhyodacitic ignimbrite eruptions began in this transect during the Late Oligocene and continued episodically through the Miocene.
Richard M Tosdal +2 more
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Two New Species of Eleutherodactylus (Anura: Leptodactylidae) from the Cordillera Occidental in Peru
Copeia, 2007Abstract Two new species of Eleutherodactylus are described from the Cordillera Occidental in northern Peruvian departments of Ancash and La Libertad. The new species from La Libertad is assigned to the Eleutherodactylus orestes Group and inhabits puna at elevations of 3400–4010 m. The Eleutherodactylus orestes Group is redefined.
Edgar Lehr, William E Duellman
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Journal of Herpetology, 2001
Four amphibian species were found on an isolated paramo (3300-3600 m) in the central part of the Cordillera Occidental of Colombia. The single salamander species is proposed as a new species of the Bolitoglossa palmata group, and the two Eleutherodactylus species are described as new. One of these appears to be a member of the E.
John D Lynch
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Four amphibian species were found on an isolated paramo (3300-3600 m) in the central part of the Cordillera Occidental of Colombia. The single salamander species is proposed as a new species of the Bolitoglossa palmata group, and the two Eleutherodactylus species are described as new. One of these appears to be a member of the E.
John D Lynch
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Geology and mineral resources of the Altiplano and Cordillera Occidental, Bolivia
1992exaly +2 more sources