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Coals of this member are generally not mined, however, near New <br />Castle on the south side of the ridge, coals of the Keystone group <br />have been mined in the past. <br />Wasatch 6 Ohio Creek Formation <br />The Wasatch 6 Ohio Creek formations overlie and are in regional <br />low-angle unconformity with the Mesaverde Group. These formations <br />consist of red and buff shale, red sandstone, and red to gray <br />conglomerate. The lower 10 to 200 feet are arkosic and con- <br />glomeratic. The upper part of the formations consist of soft red <br />to buff shales with minor amounts of sandstone. The unconformity <br />between the Wasatch/Ohio Creek and the Mesaverde makes it difficult <br />to confidently project the coals of the upper units beneath the <br />Wasatch/Ohio Creek for any great distance. <br />Quaternary Deposits <br />Quaternary unconsolidated sediments, as represented by geomorphic <br />features, were first identified using aerial photographs and then <br />field checked. The study resulted in three geomorphic categories <br />for these sediments. These units are shown in Figure 5.1-1. <br />1) Alluvium: These deposits include all sediments associated <br />directly with the active portions of the various stream <br />channels and fans. Sediment size and thickness varies consi- <br />derably between streams and within any one reach of a stream. <br />These sediments are Quaternary in age. <br />2) Terraces: Sediments associated with the inactive portions <br />of the stream channels, particularly those at much higher <br />levels have been categorized as Quaternary Terraces. These <br />terraces are most likely not associated with Pleistocene <br />glacial deposits which are found at much higher topographic <br />levels along the Colorado River. In some areas, particularly <br />those areas extensively farmed, these deposits blend into the • <br />NCBC - Coal Ridge #1 3-14 ABC/1145/900301 <br />