B. C. Osmundson

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A Department of the Interior (DOI) irrigation drainwater study of the Uncompahgre Project area and the Grand Valley in western Colorado revealed high selenium concentrations in water, sediment, and biota samples. The lower Gunnison River and the Colorado River in the study area are designated critical habitat for the endangered Colorado pikeminnow(More)
A detailed geochemical analysis (calibrated x-ray fluorescence) of the Late Cretaceous Mancos Shale was conducted on 176 cuttings samples (total interval = 4,730 ft.) collected from the Fees Federal 2-6-8-101 well (API 05-045-07432). Major elements (>2% on an oxide basis)evaluated included Si, Al, Ca, Mg, Fe, and K and minor elements (<2% on an oxide basis)(More)
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