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erosional surface when the river was at an elevation of about 8,200 feet. These Upland Terrace <br />deposits have since become eroded as the Canadian River and its tributaries have become <br />incised. In the azea of the Bourg Mine, these Upland Terrace deposits have been completely <br />eroded away by Mann Draw. Remnant exposures of the Upland Alluvial Terrace deposits still <br />cap mesa tops in the area of the Marr Strip and Canadian Strip. <br />The alluvium is present in the stream valleys of northeasterly-flowing tributaries of the Canadian <br />River. These bodies of alluvium are usually poorly sorted and fine-grained. Coarse sands and <br />gravels, when present, usually are contained in discontinuous lenticular pockets within the finer- <br />grained alluvium. <br />Mann Draw and its tributary gulches contain up to 20 feet of fine-grained alluvial deposits. The <br />alluvium consists of loam, silt and sand derived from the weathering of the Pierre Shale. <br />References Cited <br />Beekly, A.L., 1915, Geology and coal resources of North Pazk, Colorado: <br />U.S. Geological Survey, Bulletin 596, 121 p. <br />Hail, W.J., Jr., 1968, Geology of Southwestern North Pazk and vicinity, Colorado: <br />U.S. Geological Survey Bulletin 1257. <br />Kerr Coal Company, 1980, Marr Strip permit application to the Colorado Mined <br />Land Reclamation Division, File C-006-80 <br />Madden, D.H., 1978, Exploration drilling in the Coalmont coal field, Jackson <br />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, Jackson <br />County, Colorado, August-November, 1977: U.S. Geological Survey Open <br />File Report 77-888, 80 p. <br />Tweto, Odgen, 1976, Geologic map of the Craig 1° by 2° quadrangle: <br />U.S. Geological Survey Map No. I-972. <br />Walden Coal Company, 1981, Bourg Coal permit application to the Colorado <br />Mined Land Reclamation Division, File C-021-81 <br />Wyoming Fuel Company, 1981, Canadian Strip permit application to the <br />Colorado Mined Land Reclamation Division, File C-026-81 <br />Bourg Strip Mine. C-81-021 6 August 4, 1998 <br />