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On July 28, 1999, about 480 debris flows were triggered by anafternoon thunderstorm along the Continental Divide in ClearCreek and Summit counties in the central Front Range ofColorado. This cover shows the outlines of debris-flow sourceareas, travel zones, and deposits. Jonathan Godt and JeffreyCoe mapped the debris flows from 1:12,000 scale color aerialphotography using a Kern PG-2 photogrammetric plotter. Thephotographs were scaled and oriented to the topographic basemap using prominent topographic landmarks and plotted on atransparent polyester overlay registered to the topographicbase maps at 1:12,000 scale. The mapped landslides weredigitized manually in ArcInfo. The final scale of the data are1:24,000.
Thirty-nine types of surficial geologic deposits and residualmaterials of Quaternary age are described and mapped in the greaterDenver area, in part of the Front Range, and in the piedmont andplains east of Denver, Boulder, and Castle Rock. Descriptionsappear in the pamphlet that accompanies the map. Landslidedeposits, colluvium, residuum, alluvium, and other deposits ormaterials are described in terms of predominant grain size, mineralor rock composition (e.g., gypsiferous, calcareous, granitic,andesitic), thickness of deposits, and other physicalcharacteristics. Origins and ages of the deposits and geologichazards related to them are noted. Many lines between geologicunits on our map were placed by generalizing...
New 1:24,000-scale geologic mapping along the Interstate-70 urban corridor in western Colorado, in support of the USGS Central Region State/USGS Cooperative Geologic Mapping Project, is contributing to a more complete understanding of the stratigraphy, structure, tectonic evolution, and hazard potential of this rapidly developing region. The 1:24,000-scale Dillon quadrangle is near the headwaters of the Blue River and straddles features of the Blue River graben (Kellogg, 1999), part of the northernmost reaches of the Rio Grande rift, a major late Oligocene to recent zone of extension that extends from Colorado to Mexico. The Williams Range thrust fault, the western structural margin of the Colorado Front Range,...
Abstract Data Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed...
Categories: Web Site;
Tags: 08025 = Crowley,
08027 = Custer,
08035 = Douglas,
08039 = Elbert,
08041 = El Paso,
On July 28, 1999, about 480 debris flows were triggered by anafternoon thunderstorm along the Continental Divide in ClearCreek and Summit counties in the central Front Range ofColorado. This cover shows the initiation locations of thedebris flows. Jonathan Godt and Jeffrey Coe mapped the debrisflows from 1:12,000 scale color aerial photography using a KernPG-2 photogrammetric plotter. The photographs were scaled andoriented to the topographic base map using prominenttopographic landmarks and plotted on a transparent polyesteroverlay registered to the topographic base maps at 1:12,000scale. The mapped landslides were digitized manually inArcInfo. The final scale of the data are 1:24,000. For soilslips, the initiation...
This map is superceded by U.S. Geological Survey Miscellaneous Field Studies Map MF-2390.This is a digital geologic map of the Dillon Quadrangle, Summit and Grand Counties, Colorado.
Fifty-three types of surficial geologic deposits and residual materials of Quaternary age are described in a pamphlet and located on a map of the greater Pueblo area, in part of the Front Range, in the Wet and Sangre de Cristo Mountains, and on the plains east of Colorado Springs and Pueblo. Deposits formed by landslides, wind, and glaciers, as well as colluvium, residuum, alluvium, and others are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines drawn between units on our map were placed by generalizing...
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