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State Reg. <br /> less than 5,672 feet (MSL) in the southeast part along Tuttle <br /> Draw (see Exhibit 7-1) . Total topographic relief for the per- <br /> mit area is 95 feet (MSL) . <br /> Topographic features on the permit include gentle southwest <br /> facing slopes,- low rolling hills, old spoil piles, regraded <br /> mined areas cut by open pits, and shallow drains (euphemeral) <br /> which feed Tuttle Draw (intermittent) . <br /> II. REGIONAL GEOLOGY <br /> A. INTRODUCTION. Southwest Colorado exhibits a wide and unu- <br /> sual variety of physiography, mineral resources, soils, ground- <br /> water conditions, and surface water conditions which are, to a <br /> great extent, influenced by the region's geology. In this part <br /> of the San Juan Coal,Region (Nucla Naturita Coal Field) , a <br /> series of major northwest trending structural features and com- <br /> plex intraformational stratigraphic relationships control the <br /> overall occurrence and quality of coal reserves. This section <br /> will briefly describe the regional geology of the Nucla Area as <br /> an introduction to the section on site specific geology pre- <br /> sented later in this section of the permit application. <br /> B. STRUCTURE. Most of the principal structures in the Nucla <br /> Area have undergone a codex tectonic history of recurring dif- <br /> ferential uplift, subsidence, deposition, erosion, folding, and <br /> faulting beginning in early Pennsylvanian time and lasting to <br /> the present (Lohman, 1965) . The largest of these structures is <br /> the 100-mile long Uncompahgre Arch, a northwest trending upwarp <br /> whose axis follows the crest of the Uncompahgre Plateau roughly <br /> 10 to 15 miles directly north and northeast of the mine site <br /> (see Exhibit 6-2) . other well developed anticlines in the area <br /> include the Paradox Valley Complex, the Gypsum Valley Anticline, <br /> and the Sinbad Valley Anticline. These anticlines, in contrast <br /> 6 <br />