Results 201 to 210 of about 6,005,072 (242)

Neotectonic evolution of the Central Betic Cordilleras (Southern Spain)

Tectonophysics, 2005
Paleostress orientations were calculated from fault-slip data of 36 sites located along a traverse through the Central Betic Cordilleras (southern Spain). Heterogeneous fault sets, which are frequent in the area, have been divided into homogeneous subsets by cross-cutting relationships observed in the field and by a paleostress stratigraphy approach ...
Reicherter, K., Peters, G.
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Guatemala: Preliminary Zircon Ages from Central Cordillera

Science, 1968
Concordia resolution of uranium-lead analyses of zircons from rocks of the Guatemalan Cordillera indicates a period of plutonism, and perhaps metamorphism, in late Paleozoic times (345 ± 20 million years). Gneisses of the Chuacus Series yield an age of 1075 ± 25 million years which may be either the age of a source terrain for the original sediments ...
D N, Gomberg, P O, Banks, A R, McBirney
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Tectonic evolution of the central U.S. Cordillera

1994
AbstractThe evolution of the North American continent and adjacent ocean basins in the central Cordillera of the western United States in Phanerozoic time was governed by three sequential tectonic regimes. The first included the creation of a passive margin during the latest Proterozoic to Early Cambrian (Stewart, 1976) and the removal of an unknown ...
J. B. Saleeby, R. C. Speed, M. C. Blake
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Lightning and lightning fire, central cordillera, Canada

International Journal of Wildland Fire, 2002
This study examines the influences of fuel, weather and topography on lightning-caused forest fires in portions of southern British Columbia and Alberta, Canada. The results show a significant difference in lightning and lightning-caused fires east and west of the Continental Divide.
Jack Wierzchowski, Mark Heathcott, Michael D. Flannigan   +2 more
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Gravity profile of Central Cordillera, Northern Luzon

Journal of Asian Earth Sciences, 1997
Abstract In 1990, a land gravity survey was conducted approximately in an E-W traverse acrossthe Central Cordillera Mountains in Northern Luzon, Philippines. The purpose was to calibrate a digital elevation model for the Philippines. However, the gravity profile intersected the main tectonic fabric of the region, passing through the Baguio Mining ...
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Rarity and Vulnerability: The Birds of the Cordillera Central of Colombia

Conservation Biology, 1992
Abstract: The rarity of an organism is widely accepted as a good predictor of vulnerability, but rarity has been interpreted in a variety of ways. defined three dimensions of rarity for an analysis of the flora of the British Isles geographic distribution, habitat specificity, and local population size.
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Hydrocarbon–metal associations in the Western Cordillera, Central Peru

Journal of Geochemical Exploration, 2000
Abstract There are a large number of solid bitumen veins in Central Peru which are known to be ubiquitously enriched in vanadium. The bitumen was emplaced as a viscous fluid under pressure, directly influenced by the igneous and tectonic activity in the Western Cordillera.
T Haggan, J Parnell
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Late Quaternary paleosols in the western and central Cordillera of Colombia

Palaeogeography, Palaeoclimatology, Palaeoecology, 1977
Abstract More or less well preserved paleosols were studied in the submontane and montane zone of the Western and Central Cordillera, Departamento del Valle, Colombia. Their Pleniglacial age was ascertained by radiocarbon analysis of charcoal which was, in several sections, found associated with the basis of volcanic ash deposits. The two ash periods
H. Fölster, W. Hetsch, E. Schrimpff
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Climosequence of Ash‐Derived Soils in the Central Cordillera of Colombia

Soil Science Society of America Journal, 1972
Abstract Four soils derived from volcanic ash were studied in a transect on the east slope of the Central Cordillera of Colombia. Average annual temperatures range from 8C at 3,670 m altitude to 24C at 980 m. Only the soils located in the lower part of the transect have B horizons.
A. Cortes, D. P. Franzmeier
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Plant Phenological Patterns in the High Andean Cordillera of Central Chile

The Journal of Ecology, 1981
(1) Vegetative activity and flowering and fruiting records are given for ninety-seven species from three vegetational belts in the andean (alpine) zone of the Cordon del Cepo (33017'S, 70016'W), Cordillera de los Andes, central Chile. Comparisons of phenological behaviour and overall phenological patterns were made at six altitudes between 2320 and ...
Mary T. Kalin Arroyo, Juan J. Armesto, Carolina Villagran   +2 more
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