Selected hydrologic data from the Piceance Basin, Colorado
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Geology topics
F.A. Welder
Publications and source records attributed to F.A. Welder.
Ground-water reconnaissance of selected sites in Rocky Mountain National Park and Shadow Mountain National Recreation area, Colorado
An evaluation of the ground-water supply potential at 30 sites within the Rocky Mountain National Park and Shadow Mountain National Recreation Area was made by the U.S. Geological Survey in 1967 and 1968. The work consisted of a geohydrologic reconnaissance, well inventory, and test drilling. The study sites are underlain by. Precambrian crystalline rocks, Tertiary sediments, or Quaternary glacial and alluvial deposits. The crystalline rocks are generally poor aquifers; however, some wells intercepting fractures may yield as much as 10 gallons per minute from wells 100 to 200 feet deep. Wells drilled in Tertiary sandstones to a depth of 50 to 500 feet may supply 1 to 50 gallons per minute. Wells drilled in unconsolidated glacial and alluvial deposits of Quaternary age yield the largest supplies of ground water in the Rocky Mountain National Park. These deposits commonly can supply 5 to 100 gallons per minute to wells.
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Preliminary report on Bureau of Mines Yellow Creek core hole No. 1, Rio Blanco County, Colorado
Analysis of geologic, hydrologic , and geophysical data obtained in and around Yellow Creek core hole No. 1, Rio Blanco County, Colorado, indicate a 1,615-foot section of oil shale was penetrated by the hole. Geophysical log data indicate the presence of 25 gallons per ton shale for a thickness of 500 feet my be marginal. The richest section of oil shale is indicated to be centered around a depth of 2,260 feet. Within the oil shale the interval 1,182 to 1,737 feet is indicated to be relatively structurally incompetent and probably permeable. Extension of available regional hydrologic data indicate the oil shale section is probably water bearing and may yield as much as 1,000 gallons per minute. Hydrologic testing in the hole is recommended.
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