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State Reg. <br />As one can see in the cross-sections, the coal is steeply dipping with the <br />direction of dip varying with location of the cross-section on the Tow <br />Creek Anticline. Lithologically, each cross-section indicates extremely <br />lenticular beds of sandstone, shale, coal and to a lessor extent cloys and <br />siltstories. The nature of these sediments would indicate that prior to <br />deformation, the sediments were deposited in a highly transitional envi- <br />ronment. For The most part, the surface topography represents a dip <br />slope and varies with the dip of the strata. Finally, due to the structural <br />deformation of this area and irregularities in deposition of the sediment, <br />local rol Is in the coal may also be found in some of the cross-sections. <br />STRUCTURAL <br />The Washakie Structural Basin in northern Colorado is bordered on the <br />east by the Park Range (a large anticline) and on the southwest by the <br />Axial Basin Anticline. According to Bass et al. (1955), the regional <br />synclinal structure is modified by many undulations particularly in the <br />eastern and southern portions of the basin. The largest of these is the •~ <br />Tow Creek Anticline. Others are the Wolf Creek Dome, three miles <br />northwest of the Tow Creek Anticline; the Chimney Creek Dome in the <br />northeastern portion of the structural basin in Colorado; the Williams <br />Park and Beaver Creek Anticlines and the Pagoda Dome, near the <br />southern boundary of the basin; the Hart syncline in the southwestern <br />portion of the basin; and the Twenty Mile Park Basin in the eastern <br />portion of the basin. <br />Exhibit 6-12 is a structural and geologic map of Routt and Moffat <br />Counties drawn by Bass et al. (1955). On this map, faults, anticlines, <br />axes, synclinal axes and geologic units are given. Structural contours are <br />drawn on top of the Trout Creek sandstone, which is stratigraphically <br />below the Williams Fork formation. These contours illustrate the major <br />structural features in the area in relation to the Seneca II permit area. <br />The Seneca II Mine structurally lies on the southern extension of the Tow • <br />Creek Anticline. The mining originally began along the western limb of <br />the anticline with the coal striking primarily south and slightly east of <br />6-8 Revised 5/27/1981 <br />