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lavers . The lowest potential aquifer is thje. Rollins sand- <br /> stone member of the Mesaverde Formation . The Rollins is the <br /> base OzE the coal series , overll.eing the Mancos Shale . <br /> Four distinct coal beds have been identified <br /> in the Coal Basin strata : the lowest is the "A" bed ; above <br /> rr rr <br /> t1'1e. D bed ; above It the "M" Or Middle bed ; above ' it <br /> the "Placita" bed . Coal is mined from the B bed and the <br /> SSee Isopach maps at Exhibits III-D-1 and III-D-2 for <br /> :Middle beds . / In addition, fragments of the "Sunshine" seam, <br /> those two seams . <br /> which is mined some 10 miles to the north (by another <br /> operator) , have been detected-. The coal occurs above sand- <br /> stone units . The Rollins Sandstone is beneath the A and B <br /> beds ; the. Middle Sandstone is beneath the ?fiddle bed ; and <br /> the Upper Sandstone is beneath the. Placita bed . <br /> The �,iesaverde is customarily described in <br /> terms o.-L7 a lower formation, called the Ties , and an upper <br /> formation called the Williams fork. The Iles Formation <br /> overlies the Mancos Shale and , as noted , the ?diliiams Fork <br /> formation overlies the Iles . <br /> The Iles Formation consists of two sandstone <br /> members divided by a 1 , 000 ' " tor_gue" o.i shale . The lower <br /> member , the Cv^ZZette, is a 6-foot la,7er Of very fine grained , <br /> silt': sandstone , Which overlies a 40-.foot thick layer of <br /> silty to sandy shale . <br /> The upper sandstone member o;: the Iles forma- <br /> Lion, known as the Rollins , iS '120 ' - 140 ' thick, and forms <br /> the base of the coal Series . shale tongue of 7 tc. 30 ' <br /> � � 9 <br />