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lenses are not hydrologically connected to other aquifers. Should one <br />of the lenses be encountered during mining, only a small amount of <br />water would be produced and then would quickly dry up. <br />Six test holes were drilled <br />D-3-10 ), The stratigraphy <br />summarized in Figure 3.5.1-1 <br />Hydrology Description-Mine. <br />drilling of these holes, inc <br />is in Appendix 3-D. <br />Stratigraphy <br />within the mine area (Drawings D-3-4 and <br />and water-bearing zones encountered are <br />and discussed in detail in Section 3.6.1, <br />All information collected during the <br />luding lithologic descriptions and ground <br />The exposed rock sequence in the mine area is Pennsylvanian through <br />Cretaceous in age and includes the Maroon, Entrada, Morrison, Dakota, <br />Mancos Shale, the coal-bearing Mesaverde Group, the Wasatch Formation, <br />and numerous unconsolidated deposits. Figure 3.5.1-1 shows the <br />general stratigraphic relationships of the immediate mine area. <br />Maroon Formation. Approximately 2 miles east of the mine area, the <br />Maroon Formation consists of steeply dipping (80 to 90 degrees) red to <br />tan sandstones and conglomerates, 2,000 feet thick. <br />Entrada Formation. The Entrada is a light red to cream sandstone, 100 <br />to 200 feet thick, which generally forms slopes along the Grand Hogback. <br />Morrison Formation. The Morrison consists of brightly colored <br />variegated shales, siltstones, and sandstones. It is easily eroded to <br />form steep slopes below the Dakota Sandstone and depressions in areas <br />of near vertical dip. <br /> <br />3-19 <br />~~ <br />