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U.S. GEOLOGICAL SURVEY McCALLUM AREA <br />' DRILL-HOLE LOG, JACKSON COUNTY, COLORADO <br />Hole No. G10 Map Gould NW Date logged 8-26-77 Elevation (f t) 8310 <br />Location: T. 9 N. , R. 78 W. , sec. 20 1850 FS L 900 FE L Cored: ~ Yes ® No <br />Drilled depth 120 Logged depth 120 Drilling medium air Fluid level 48 <br />Geophysical logs: <br />Spontaneous potential (SP): Scale 50 my/in Logging speed 20 fpm <br />Resistivity (RES): Scale 500 ohms/in Logging speed 20 fpm <br />Gamma (G): T.C. 4 Scale 100 cps/in Logging speed 20 fpm <br />Density (DEN): T.C. 4 Scale 32 Kcps/in Logging speed 20 fpm <br />Remarks: Dip of strata is approximately 25o SW. <br /> <br />LITHOLOGY ~ ~ <br />a <br />° GEOPHYSICAL LOGS <br /> p <br />., <br />~ <br />°1 <br />G SP RES DEN <br />d <br />i <br />sh-orange, <br />0-55 San <br />stone, gray <br />l <br />lid <br />t <br />d <br />Fi <br />poor <br />y conso <br />a <br />. <br />e <br />nes _ <br />upward from very coarse- _- <br />grained (to 40'), to medium- <br />' - _ - <br />- <br />to fine-grained (above 40 <br />) _ <br />- - <br /> <br /> <br />55-60 Mudstone, light-gray = <br />7 ~ <br /> _ <br /> _- - <br />- <br /> __ <br /> <br /> <br /> <br />60-98 Coal <br /> <br /> <br /> <br />98-120 Sandstone, light-gray, well- 1 '~ <br />consolidated <br />ward <br />Fines u _ <br />. <br />p <br />from medium- to fine-grained +~ ~ <br /> <br />DEPTH <br />FT M <br />10 <br />50 <br />20 <br />100 30 <br />40 <br />150 <br />SO <br />200 60 <br />70 <br />250 <br />80 <br />90 <br />38 <br />