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analyses of water Aztec Sandstone beds Blue Point Spring brown caliche Callville Bay carbonate rocks Chemical analyses clay coarsely crystalline colluvium colluvium and alluvium conglomerate facies deposits dissolved solids dissolved-solids concentrations Echo Bay Environmental Protection Agency evaporite felsic fine-grained Fortification Basalt Member gal/min gallons per minute glauberite ground water gypsum halite Horse Spring Formation Lake Mead National land surface Laney limestone lithologic log LMNRA mafic Mead National Recreation Mesozoic rocks Mesozoic sedimentary rocks mg/L Middle Point Moapa Valley Muddy Creek Formation Muddy Mountains mudstone facies National Recreation Area Nevada older alluvium Overton Arm Overton Beach Paleozoic and Mesozoic rock units Rogers Spring Fault samples Sand and gravel Sandstone sedimentary rocks seeps shale siltstone Stauffer Chemical Company study area subsurface flow test hole U.S. Environmental Protection U.S. Geological Survey undifferentiated Unnamed spring Vegas Wash Virgin River Virgin RiveróContinued volcanic rocks Wash to Virgin water from Lake younger alluvium