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<br /> <br />Mesaverde Group is at the surface in the area of this <br />report (Bass, Eby, and Campbell 1956), A brief report <br />on stratigraphy of the Steamboat Springs area by <br />T.G, Larson (1955) describes rocks down to Precambrian, <br />mostly from an oil test hole at Tow Creek (sec. 18, <br />T. 6 N., R, 86 W,), <br />The only coal-bearing strata in the area are the Iles <br />and Williams Fork Formations of the Mesaverde Group. <br />Only beds of the Williams Fork Formation are at the <br />surface, except along Middle Creek (E1/2 and E1/2SW1/4, <br />sec. 9, T. 5 N., R. 86 W.), where the conformably under- <br />lying Iles Formation crops out. The coal currently <br />being mined at Energy Fuels 3 mine is the Wadge coal <br />bed of the lowest coal series in the Williams Fork <br />Formation. <br />The Trout Creek Sandstone Member of the Iles Formation, <br />a cliff-forming white sandstone about 100 feet thick, <br />and the Twentymile Sandstone Member of the Williams <br />Fork Formation, a 100-200 foot thick, xhite, cliff- <br />forming sandstone unit, are prominent markers <br />throughout this coal bearing area, <br />Alluvium of Quarternary age is present mostly along the <br />main streams. Its thickness and nature are not well <br />known. It consists mainly of sand, silt, and lesser <br />30 <br />