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Filters: Tags: Mancos Shale (X) > Date Range: {"choice":"year"} (X)

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Contact between Mancos shale and igneous rock, head of Harts Draw Wash, Abajo Mountains. San Juan County, Utah. 1915. (Photo by M.R. Thorpe).
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This digital dataset was created as part of a U.S. Geological Survey hydrologic resource assessment and development of an integrated numerical hydrologic model of the hydrologic system of the Upper Colorado River Basin, an extensive region covering approximately 412,000 square kilometers in five states: Wyoming, Colorado, Utah, Arizona, and New Mexico. As part of this larger study, the USGS developed this digital dataset of geologic data and a three-dimensional hydrogeologic framework model (3D HFM) that define the elevation, thickness, and extent of seven hydrogeologic units in the Upper Colorado River Basin. The hydrogeologic setting of the Colorado Plateau consists of thick Paleozoic, Mesozoic, and Cenozoic aquifers,...
Tags: 3D, Arizona, Chinle Formation, Colorado, Colorado Plateau, All tags...
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Mitigating the effects of salinity (total dissolved solids) and selenium on water quality in the lower Gunnison River Basin (LGRB) of western Colorado is a major concern for land managers. In cooperation with the Bureau of Reclamation, the U.S. Geological Survey completed a study to develop multiple linear regression models to estimate salinity and selenium loads. The objective of the study was to refine existing models by improving the regressions and using additional geospatial and water-quality data. This data release presents the basin characteristics and loads used to calibrate the models. Also provided are salinity and selenium yield rasters determined by empirical Bayesian kriging of loads estimated by the...
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Contact between Mancos shale and igneous rock, at head of Harts Draw, Abajo Mountains. San Juan County, Utah. 1915 (Photo by M.R. Thorpe)
    map background search result map search result map Basin Characteristics and Salinity and Selenium Loads and Yields for Selected Subbasins in the Lower Gunnison River Basin, Western Colorado, 1992─2013 Digital hydrogeologic framework model of the Upper Colorado River Basin, western U.S. Basin Characteristics and Salinity and Selenium Loads and Yields for Selected Subbasins in the Lower Gunnison River Basin, Western Colorado, 1992─2013 Digital hydrogeologic framework model of the Upper Colorado River Basin, western U.S.