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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 Frisco quadrangle is near the headwaters of the Blue River and straddles features of the Blue River graben (Kellogg, K.S., 1999, Neogene basins of the northern Rio Grande rift�partitioning and asymmetry inherited from Laramide and older uplifts: Tectonophysics, v. 305, p. 141-152.), part of the northernmost reaches of the Rio Grande rift, a major late Oligocene...
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,...
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...
Spatial Geologic Data Model for the Gunnison, Grand Mesa, Uncompahgre NationalForests Mineral Resource Assessment Area, Southwestern Coloradoand Arc/Info versions of the Leadville, Durangeo and Montrose 2 degreequadrangles as well as the Colorado half of the Grand Junction, Moab andCortez 2 degree quadrangles.
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.
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