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• Drill-hole RB-18 <br />[All depths are in feet; to convert to meters, multiply by O.J048~ <br />Location: SESGNW~ see. 19, T. 4 N., R. 86 W., Rattlesnake Butte quadrangle, <br />Roust County, Colorado <br />Surface elevation: 7,746 ft <br /> Depch (ft) <br />Lithologie description From To <br />Sandstone, yellow and gray, fine-grained, salt-and- <br />pepper, with black chart-------------------------------- 0 20 <br />Sandstone, yellow and gray, Eine-grained; broom and gray <br />eiltstone and shale stringers--------------------------- 20 25 <br />Sandstone, yellow and gray, fine-grained------------------ 25 35 <br />Siltatone and shale, brownish-gray, medium-grained-------- 35 40 <br />Shale, dark-gray; carbonaceous shale---------------------- 40 45 <br />Shale, carbonaceous; coal--------------------------------- 45 50 <br />• Shale, gray to dark-gray; light-gray siltstone------------ 50 55 <br />Shale, dark-grayish-brown, carbonaceous; light-gray <br />siltstone------------------------------------°------ 55 60 <br />Shale, carbonaceous--------------------------------------- 60 63 <br />Coal; carbonaceous shale - Wadge coal bed----------------- 63 73 <br />Siltatone, light-gray, and dark-gray shale---------------- 73 80 <br />Sandstone, very light gray to whitish-gray, very fine <br />grained---------'--------------------------------------- 80 85 <br />Sandstone, light-gray, very fine grained, and light- <br />brownish-gray siltstone--------------------------------- 85 90 <br />Siltstone, medium- to dark-gray; dark-gray shale---------- 90 100 <br />Sandstone, light- to medium-gray, very Fine grained; dark <br />shale and dark silts[one-------------------------------- 109 115 <br />14 <br />• <br />