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).
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