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U. S. GEOLOGICAL SURVEY <br />DRILL-HOLE LOG, JACKSON COUNTY, COLORADO <br />Hole No. C18 (continued) <br />LITHOLOGY a GEOPHYSICAL LOGS DEPTH <br /> y G SP RES DEN FT M <br /> <br /> <br /> <br />d <br />t <br />300-340 M -- <br />u <br />s <br />one 100 <br /> <br /> <br /> 350 <br /> 110 <br /> 120 <br /> 400 <br /> 130 <br /> 450 <br /> 140 <br /> 150 <br /> 500 <br /> 160 <br />' 550 <br /> 170 <br /> 180 <br /> 600 <br /> 190 <br /> 650 20C <br /> 21C <br /> inn <br />57 <br />