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TABLE 4-1 <br /> STRATICRAPIfY OF T!!E PfINF. PLAN AND ADJACENT AREAS <br /> Estimated <br /> System Formation Member Thickness LitholoRy <br /> Quaternary Alluvium - Variable Sands and <br /> gravels with <br /> some silts <br /> and clays <br /> Cre[ar- Lewis Shale -L 1500-1900 ft Mainly dark <br /> ceous gray marine <br /> shales and <br /> sandy shales <br /> with minor <br /> sandstones <br /> Williams Fork Upper Williams 680+ Et Interbedded <br /> Mesa Verde Group) Fork shales, sandy <br /> shales and <br /> coal seams; <br /> contains <br /> several white <br /> sandstones; <br /> variably thin <br /> to [hick <br /> bedded <br /> Twenty Mile 100+ ft Massive cliff <br /> Sandstone forming <br /> <br />• ; auartzose <br /> sandstone <br /> Lower Williams 920+ Et Interbedded <br /> Fork soft <br /> sandstones <br /> sandy shales <br /> carbonaceous <br /> shales and <br /> coal seams; <br /> and clinker <br /> zones <br /> Iles Formation Trout Creek 100+ ft Massive white <br /> Sandstone sandstone, <br /> cliff former <br /> Main Body 1300+ f[ Mainly <br /> sandstone <br /> with <br /> interbedded <br /> subordinate <br /> shales <br />~~ " Mancos Shale 4000+ ft Gray <br /> homogeneous <br /> marine <br /> shales <br />-18- <br />