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Structural-stratigraphic framework and correlation of coal beds in the Tongue River and Sentinel Butte Members of the Fort Union Formation, Daglum 15-minute quadrangle, Billings, Stark, and Slope Counties, North Dakota
Jim S. Hinds
1983, Miscellaneous Field Studies Map 1345-A
The Daglum quadrangle of southwestern North Dakota (see index map) is underlain by 11 lignite beds that exceed 5 ft in thickness within the Sentinel Butte and Tongue River Members of the Fort Union Formation.  Six of these bed crop out within the quadrangle.  This report illustrates the stratigraphic position,...
Mineral resource potential map of the Buffalo Peaks Wilderness Study Area, Lake, Park, and Chaffee Counties, Colorado
D. C. Hedlund, G.A. Nowlan, R. H. Wood
1983, Miscellaneous Field Studies Map 1628-A
Under the provisions of the Wilderness Act (Public Law 88-577, September 3, 1964) and the Joint Conference Report on Senate Bill 4, 88th Congress, the U.S. Geological Survey and the U.S. Bureau of Mines have been conducting mineral surveys of wilderness and primitive areas. Areas officially designated as "wilderness," "wild,"...
Mineral resource potential of the Piedra Wilderness Study Area, Archuleta and Hinsdale counties, Colorado
Alfred L. Bush, Steven M. Condon, Karen J. Franczyk, S. Don Brown
1983, Miscellaneous Field Studies Map 1630-A
The mineral resource potential of the Piedra Wilderness Study Area is low. No occurrences of metallic minerals, of valuable industrial rocks and minerals, or of useful concentrations of organic fuels are known in the study area. However, a noneconomic occurrence of gypsum in the Jurassic Wanakah Formation lies a few hundred feet west...