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The Hoyle seam is locally discontinuous. This seam was only mined at the Bourg Mine <br />where the seam attains a minable thickness of 16 feet. This seam lies about 80 feet <br />above the Sudduth seam. <br />The Capron seam is stratigraphically located about 2,400 feet above the Sudduth coal <br />and is cotrtmonly split into two beds. The Capron seam is not currently mined in the <br />North Park Coal Field. <br />Previous glaciation and stream action have eroded the rock strata down to a broad <br />alluvial plain. The Canadian River then deposited a 2.0 to 5.0 foot thick mantle of river <br />alluvium over this erosional surface when the river was at an elevation of about 8,200 <br />feet. These Upland Terrace deposits have since become eroded as the Canadian River <br />and its tributaries have become incised. In the area of the Bourg Mine, these Upland <br />Terrace deposits have been completely eroded away by Mann Draw. Remnant exposures <br />of the Upland Alluvial Terrace deposits still cap mesa tops in the area of the Marr Strip <br />and Canadian Strip. <br />The alluvium is present in the stream valleys of northeasterly-flowing tributaries of the <br />Canadian River. These bodies of alluvium are usually poorly sorted and fine-grained. <br />Coarse sands and gravels, when present, usually are contained in discontinuous lenticular <br />pockets within the finer-grained alluvium. <br />Mann Draw and its tributary gulches contain up to 20 feet of fine-grained alluvial <br />deposits. The alluvium consists of loam, silt and sand derived from the weathering of <br />the Pierre Shale. <br />References Cited <br />Beekly, A.L., 1915, Geology and coal resources of North Park, Colorado: <br />U.S. Geological Survey, Bulletin 596, 121 p. <br />Hail, W.J., Jr., 1968, Geology of Southwestern North Park and vicinity, <br />Colorado: U.S. Geological Survey Bulletin 1257. <br />Kerr Coal Company, 1980, Marr Strip permit application to the Colorado <br />Mined Land Reclamation division, Fite C-006-80 <br />Madden, D.H., 1978, Exploration drilling in the Coalmont coal field, <br />Jackson County, Colorado, June-November, 1977: U.S. Geological Survey Open <br />File Report 77-887, 138 p. <br />Madden, D.H., 1978, Exploration drilling in the McCallum coal field, <br />Bourg Strip Mine. C-81-021 6 April 21, 1993 <br />