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• Drill-hole RB-18 - continued <br /> Depth (ft) <br />Li[hologic description From To <br />Sandstone, medium-grayish-brown; carbonaceous shale------- 222 230 <br />Coal; carbonaceous shale - Wolf Creek coal bed------------ 230 251 <br />Siltstone, light-brown; carbonaceous shale (20z)---------- 251 255 <br />Sandstone, light-brown, medium-grained; dark shale-------- 255 270 <br />.Sandstone, light- to medium-grayish-brown, medium-grained; <br />carbonaceous shale-------------------------------------- 270 275 <br />Coal------------------------------------------------------ 275 276 <br />.Sandstone, light- Co medium-grayish-brown, medium-grained; <br />carbonaceous shale------------------------------------- 276 280 <br />Clay, white; siltstone------------------------------------ 280 284 <br />Coal----------------------------------------------------- 284 285 <br />Clay, white----------------------------------------------- 285 290 <br />white <br />rained <br />Sandstone <br />ver <br />fine <br />clean - Trout Creek <br />, <br />y <br />g <br />, <br />, <br />Member-------------------------------------------------- 290 315 <br />Total depth - 315 ft <br />16 <br /> <br />