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1 Gw"7 I`?J??n? LnC. <br />n?/ b"LJA ae u1(t/S <br />f? 105°30' <br />EXPLANATIC <br />Geology <br />Unconsolidated allu <br />of Quaternary age <br />Sedimentary rocks c <br />Intrusive and volcar <br />Tertiary and Cretac( <br />Sedimentary rocks <br />and Jurassic age <br />Sedimentary rocksi <br />® Crystalline rocks of <br />Aquifer type <br />Q Alluvial <br />Q Crystalline rock <br />Q Sedimentary rock <br />® Volcanic rock <br />A Undetermined <br />0 5 10 15 20 MILES <br />0 5 10 15 20 KILOMETERS <br />Figure 18. Aquifer type determined from screened interval for wells sampled by the U.S. Geological Survey in Park <br />County. <br />3 <br />GROUND-WATER QUALITY A <br />Geology from Green, 1992; Tweto, 1979 <br />Base from U.S. Geological Survey digital data, 1:100,000 <br />Universal Transverse Mercator projection, <br />Zone 13