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Section 2.04.6 Geology Description <br />• (1) Surface mining. <br />hot applicable. ~ <br />(2) Underground Mining. <br />(a) A general statement of the geology down to and including the <br />first aquifer, and other coal seams, below the lowest coal seam <br />to be mined. <br />(i) The nature, depth, and thickness of the coal seams to be <br />mined, any coal seams above the seam to be mined, each stratum <br />of the overbu-den, and the stratum immediately below the lowest <br />coal seam to be mined. <br />Geologic units which are present beneath and in the immediate <br />area of the Red Canyon #1 Mine and proposed #2 Dtine consist o! <br />(in ascending order): Cretaceous Age Mancoa Shale; Rollins <br />• Sandstone Member, Iles Foomation of the Mesaverde Group; the Bowie <br />Shale Member (coal bearing unit) of the Williams Fork Formation, <br />Mesaverde Group: and Quaternary Age younger glacial outwaeh and <br />alluvial deposits. The following are descriptions of each of these <br />units. <br />Mancoa Shale: Mancoa Shale consists of marine, calcareous black. <br />shale deposited in a Cretaceous inland sea. Mancoa Shale in this <br />vicinity is several thousand feet thick and contains essentially <br />no productive coal units, aquifer systems or other ecomically <br />significiant deposits. <br />Rollins Sandstone: Rollins Sandstone is a fine grained, calcareous <br />cemented, massive marine to nonmarine transitional unit marking <br />the top of the ilea Formation, the lower unit of the Mesaverde Group. <br />it is exposed to the south and southwest of the Red Canyon #1 Mine <br />and proposed #2 !tine site forming the most prominent cliff in the <br />entire region. This unit forma the most consistent (laterally and <br />• vertically) sandstone aquifer in the area. The use, however, is very <br />sl <br />I. . <br />--~ <br /> <br />