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<br />Drill-hole RB-18 - continued <br />Depth (ft) <br />Lithologic description From To <br />Sandstone, medium-gray, very fine grained----------------- 115 120 <br />Sandstone, light-gray, very fine grained------------------ 120 125 <br />Sandstone, Light-gray, very fine grained; carbonaceous <br />shale--------------------------------------------------- 125 130 <br />Sandstone, light-gray, very fine grained; carbonaceous <br />shale--- ------------------------------------------------ 130 135 <br />Sandstone, medium-gray, very fine grained, with coal <br />streaks; coal (10-LSX)---------------------------------- 135 140 <br />Siltetone, medium-gray, with coal streaks----------------- 140 145 <br />Sandstone, light- to medium-gray, very fine grained, <br />salt-and -pepper, with coaly streaks--------------------- 145 L50 <br />• Sandstone, medium-grained, very fine grained; carbonaceous <br />shale--- ------------------------------------------------ 150 155 <br />Sandstone, light- to medium-gray, very fine grained; <br />carbonac eous shale; light-gray sandy Siltstone---------- 155 165 <br />Sandstone, medium- to dark-gray, very fine grained, silty- 165 170 <br />Siltetone to shale, medium- to dark-gray------------------ 170 175 <br />Siltstone, medium-gray------------------------------------ 175 180 <br />Siltstone, medium-gray, with dark Siltstone laminations--- 180 185 <br />Mudstone, dark-grayish-brown------------------------------ L85 200 <br />Sandstone, reddish-brown, very fine grained--------------- 200 205 <br />Sandstone, light-tan, very fine grained; coal (0-SX)------ 205 210 <br />Sandstone, medium-grayish-brown; carbonaceous shale------- 210. 222 <br />15 <br />• <br />