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<br />a. <br /> <br /> least 60 feet thickness are composed of coarse grained sandstone <br />' and gravels with minor interbeds of clay and silt fill the <br /> valley bottoms (See hydrogeologic cross sections on plates 2, 3 <br /> and 4). <br /> <br /> The Kirkland shale is predominately a gray shale that is <br /> underlain by interbedded sandstone, siltstone, shale, car- <br /> bonaceous sandstone, and siltstone and coal of the Fruitland <br />' Formation. Three important coal seams are located within the <br /> Fruitland Formation as shown on the hydrogeologic cross sec- <br />, tions. The lowermost coal (C-seam) is separated from the <br />f <br />t <br />30 f <br />f <br />l <br />d <br />b <br />i <br /> fs san <br />stone <br />y approx <br />ma <br />ely one to <br />eet o <br />Pictured C <br />i <br /> shale and sandstone. <br /> <br /> The Pictured Cliffs sandstone is a massive sandstone that <br /> underlies the Fruitland Formation throughout the study area. <br /> <br /> <br /> <br /> <br /> <br />D n PILE AUB ASSOC~A LES UMrtEO <br />