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Table 1.--Generalized description of geologic units <br /> <br />v m <br />v <br />y Geologic Units Lithology <br />T v <br /> Alluvial deposits Clay, silt, sand, and gravel; some slopewash material <br /> G (Welder, 1968; Welder and McGreevy, 1966). <br /> v <br />U <br /> O <br />-4 <br /> 1 <br />x Windblown sand Sand and silt, unconsolidated. Both active and inactive sand dunes <br /> n widely scattered throughout area (Welder and McGreevy, 1966). <br />>, C <br />CO <br />N <br />v y Glacial deposits Clay, silt, sand, gravel, and boulders (Welder and McGreevy, <br /> <br />CO <br />o 1966• Welder, 1968). <br />Z <br />o' N <br />m <br /> v <br /> P. Gravel deposits Gravel, pebble to boulder size; sand; and silt (Welder and <br /> McGreevy, 1966; Welder, 1968). <br /> G Igneous rocks Alkalic intrusive and extrusive rocks (Welder and McGreevy, <br /> 1966; Welder 1968). <br /> 0 <br />,a <br /> Bridger Formation Sandy, tuffaceous mudstone. Interbedded medium-grained tuffaceous <br /> aCi sandstone; minor amounts of shale, limestone, and dolomite. As <br /> o much as 15 to 20 percent of formation is volcanic ash <br /> w (Bradley, 1964; Welder and McGreevy, 1966; Welder, 1968). <br /> d <br /> v <br />U Green River and Wasatch Calcareous sandstonef siltstones marlstones mudstonef some oil <br /> N0 <br />w <br />Formations and <br />shale, and minor amounts of dolomite. (Bradley 1964; <br /> .b Tertiary, undivided. Welder, 1968; Welder and McGreevy, 1966). <br />S4 0 <br />`a <br />.14 <br />4-J <br />Q) <br />y v Main body of the Sandy, variegated mudstone, fine- to medium-grained calcareous <br />F U Wasatch Formation sandstone, carbonaceous shale, small amounts of oil shale <br /> and coal, conglomeratic sandstone near periphery (Bradley, <br /> P. 1964; Welder, 1968; Welder and McGreevy, 1966). <br /> m <br />W v Lewis Shale Sandstone, siltstone, limestone, and bentonite (Haun, 1961; <br />o CO Welder and McGreevy, 1966). <br />W <br />m 41 <br />? <br /> s <br />+ <br />W N Almond Formation Sandstone, siltstone, coal, and carbonaceous shale (Welder and <br /> W McGreevy, 1966). <br /> a <br />RECAMBRIAN Igneous and metamorphic rocks Granite, gneiss, and schist (Welder and McGreevy, 1966).