C 14 dating ; Colluvium ; Colorado ; Dendrochronology ; Flood ; Geochronology ; Quaternary ; United States ; Watershed
The AA. present evidence for multiple late Quaternary paleofloods in Arthurs Rock Gulch, a small ephemeral drainage basin in the Colorado Front Range foothills near Fort Collins, Colorado; and describe their approach to paleoflood retrodiction
Biogeography ; Colorado ; Dating ; Fire ; Forest ; Forestry ; Mountain ; United States
The main objectives of this study are : 1) to characterize the fire regime of an area of montane forest in the Colorado Front Range; and 2) to compare the utility of the different methods of dating fires in these forests.
Periglacial landforms of Southern Africa compared with those of Colorado and New Mexico
Afrique du Sud ; Colorado ; Domaine aride ; Etats-Unis ; Limite des arbres ; Montagne ; New Mexico ; Paléo-environnement ; Paléoclimat ; Périglaciaire
Arid land;Arid environment ; Colorado ; Mountain ; New Mexico ; Palaeo-environment ; Palaeoclimate ; Periglacial features ; South Africa ; Tree line ; United States
Periglacial landforms in southern Africa and the alpine zone of Colorado and New Mexico are compared. Lower altitudinal features in southern Africa reflect a drier environment. - (AJC)
Atmosphere ; Atmospheric dynamics ; Colorado ; Cyclogenesis ; Cyclone ; Seasonal variation ; Stratosphere ; Troposphere ; United States of America
This paper attempts to clarify the extent to which intrusions of stratospheric air are associated with ordinary (non-explosive) cold-season Colorado cyclogenesis and compare the magnitude and motion of these intrusions (when present
Diversity and disturbance in a Colorado subalpine forest
Colorado ; Dynamique de la végétation ; Dégradation de la végétation ; Etats-Unis ; Forêt ; Montagne ; Vent ; Végétation
Colorado ; Forest ; Mountain ; United States ; Vegetation ; Vegetation degradation ; Vegetation dynamics ; Wind
Diversity of understory plant species in a disturbed subalpine forest in the Colorado Rockies was examined to explore the hypothesis that intermediate levels of disturbance generate and maintain high levels of diversity. The AA. use a natural
experiment, where a severe but patchy windstorm damaged the canopy of a subalpine forest in the Colorado Front Range in 1974. The results suggest that intermediate levels of disturbance severity may offer more microhabitats, at least temporarily, for a wider
Atmospheric circulation ; Climate oscillation ; Climatic warming ; Colorado ; Dendrochronology ; Dendrology ; El Niño ; Ocean atmosphere interaction ; Temperature ; United States
The inflence of climate associated with El Niño/Southern Oscillation (ENSO) events on tree growth in the central Colorado Front Range is investigated through the analysis of two high altitude tree-ring chronologies. Dendrochronological techniques
are used to determine if ENSO-related climatic effects are detectable in tree-ring width patterns in the central Colorado Front Range. The form of the tree growth response is identified and the variability of the influence of these events on tree growth
Development and application of a method to estimate short-term alpine sediment transfer in the Colorado Front Range, U.S.A.
Bassin-versant ; Bilan sédimentaire ; Colorado ; Dynamique de versant ; Erosion des sols ; Etats-Unis ; Front Range ; Géographie physique
Using photogeologic techniques to develop a terrain classification, clastic sediment movement was evaluated in the Roaring River Watershed in the Colorado Front Range. - (DWG)
Stratigraphy and correlation of glacial deposits of the Rocky Mountains, the Colorado Plateau and the ranges of the Great Basin in Quaternary glaciations in the Northern Hemisphere.
Colorado Plateau ; Etats-Unis ; Glaciaire ; Great Basin ; Géographie de l'Amérique ; Montagne ; Quaternaire zones moyennes ; Rocky Mountains ; Stratigraphie
Tills of eight and possibly nine Pleistocene glaciations are recognized in the region of the Rocky Mountains, the Colorado Plateau and the ranges of the Great Basin, except in the Yellowstone Park area where twelve are recognized.
The lower Colorado River valley : a Pleistocene desert
Colorado River Valley ; Domaine aride ; Etats-Unis ; Géographie de l'Amérique ; Histoire de la végétation ; Pléistocène supérieur ; Quaternaire zone chaude ; Végétation ; Zone subtropicale
A chronological sequence of plant macrofossil assemblages from twenty-five pack rat middens provides a record of desert scrub vegetation for most of the last 13,380 yr BP from a hyperarid portion of the lower Colorado River Valley.
Avalanche ; Catastrophe ; Colorado ; Etats-Unis ; Géographie de l'Amérique ; Géoécologie ; Risque ; Typologie ; Télédétection ; Utilisation du sol
Etude pluridisciplinaire des régions montagneuses du Colorado pour déterminer les zones sujettes aux catastrophes naturelles. L'étude insiste sur les avalanches, dont la fréquence augmente, et fait largement usage de la télédétection. (Vnm).