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U.S. GEOLOGICAL SURVEY McCALLUM AREA <br />DRILL-HOLE LOG, JACKSON COUNTY, COLORADO <br />Hole No. G4 Map Gould NW Date logged 8-25-77 Elevation (f t) 8390 <br />Location: T. 8 N., R. 78 W., sec. 4 2000 FS L 1700FW L Cored: ~ Yes ©No <br />Drilled depth 292 Logged depth 292 Drilling medium Air Fluid level 0 <br />Geophysical lOKa: <br />Spontaneous potential (SP): Scale 50 my/in Logging speed 20 fpm <br />Resistivity (RES): Scale 500 my/in Logging speed 20 fpm <br />Gamma (G): T.C. 4 Scale 200 cps/in Logging speed 20 fpm <br />Density (DEN): T.C. 4 Scale 3.2 Rcps/in Logging speed 20 fpm <br />Remarks: <br />LITHOLOGY <br />0-20 Gravel, and yellowish-gray sand <br />20-50 Mudatone, medium-gray <br />50-70 Sandstone, medium-light-gray, <br />medium-grained <br />70-91 Mudatone, medium-gray, and inter- <br />bedded, medium-light-gray, <br />medium-grained sandstone <br />91-105 Coal, 91'-105', mudetone 97'-98' <br />105-257 Mudatone, brownish-gray and <br />medium-gray <br />257-274 Coal, interbedded gray mudstone <br />274-292 Mudstone, brownish-gray and _ <br />medium-light-gray _ <br />GEOPHYSICAL LOGS I DEPTH <br />G I SP RES I DEN I FT I M <br />10 <br />50 <br />20 <br />100 30 <br />40 <br />150 <br />50 <br />200 60 <br />70 <br />250 <br />80 <br />90 <br />23 <br />