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Acomita alluvium angular aquifer artesian basalt Bearpaw Bearpaw Shale Belknap Bluff Sandstone Burro Canyon chemical quality coarse sand contains calcareous material Cretaceous Dakota Sandstone dark-gray deposits depth dissolved solids drawdown drilled Entrada Entrada Sandstone fairly well sorted feet thick fine-grained flow gpm reported gray ground water ground-water Hermanos Sandstone Member Indian Reservation interbedded irrigation test Judith River Formation Junction Creek Jurassic land surface light-gray limestone Little Rocky Mountains Mancos Shale medium-dark-gray medium-grained Mesa Verde Mesaverde Group miles Milk River Milk River valley Mission Canyon moderately well sorted Montana Morrison Formation Mudstone outcrop overlying Paguate percent permeable poorly sorted potable water ppm of dissolved pueblo test pumping quartz quartz grains recharge Rio San Jose sand and gravel sandstone beds sandy sedimentary rocks silt siltstone slightly silty Specific conductance subrounded to subangular supply terrace Towaoc Tres Hermanos Sandstone U.S. Geol unconsolidated Ute Mountains Water reported well-sorted
Page E-2 - The ability of an aquifer to transmit water is expressed by its coefficient of transmissibility, which is expressed as the rate of flow of water, at the prevailing water temperature, in gallons per day, through a vertical strip of the aquifer 1 foot wide extending the full saturated height of the aquifer under a hydraulic gradient of 100 percent.
Page 656 - The coefficient of storage of an aquifer is defined as the volume of water it releases from or takes into storage per unit surface area of the aquifer per unit change in the component of head normal to that surface. This coefficient is a dimensionless number. The coefficient of storage of a nonartesian aquifer is nearly identical with the specific yield of the aquifer.
Page E-36 - Sulfate (SO4) should not exceed 250 ppm Phenolic compounds should not exceed 0.001 ppm in terms of phenol. Total solids should not exceed 500 ppm for a water of good chemical quality. However, if such water is not available, a total solids content of 1,000 ppm may be permitted.
Page 659 - A part per million is a unit weight of a constituent in a million unit weights of water.
Page 659 - Includes detritus, silt, muck, and marl. specific conductance - A measure of the ability of water to conduct an electric current. It is therefore a measure of the total dissolved electrolytes in water and has use in determining relative purity of waters.
Page F-45 - GH, 1888, On some stratigraphical and structural features of the country about Denver, Colorado : Colorado Sci. Soc. Proc., v. 3, pt. 1, p. 86-118.
Page F-47 - Origin and mechanics of the thrust faults adjacent to the Bearpaw Mountains, Montana : Geol.
Page E-15 - The term is used for soil extracts and irrigation waters to express the relative activity of sodium ions in exchange reactions with soil.
Page F-45 - Corry, AV, 1933, Some gold deposits of Broadwater, Beaverhead, Phillips, and Fergus Counties, Montana: Montana Bur. Mines and Geology Mem. 10, 45 p.
Page F-47 - WH, 1899, Description of the Fort Benton quadrangle [Montana] : US Geol. Survey Geol. Atlas Folio 55, 9 p. White, W. A,, 1958, Water sorption properties of homoionic clay minerals: Illinois Geol. Survey Rept. Inv. 208, 46 p. Wickman, f. B., 1954, The "total" amount of sediments and the composition of the "average igneous rock