Bulletin of the United States Geological SurveyThe Survey., 1906 - Geology |
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analysis Anthracite Range bank basalt bituminous California Park coal beds coal field coal seams Colorado Craig Creek Canyon Creek district Cretaceous Dakota Dakota formation dark shale Dunkley east Eddy Elkhead Creek entry exposed feet thick fold group of coals Hayden surveys hogbacks horizon igneous rock igneous sheet inches interval known Laramie formation ledges Lewis shale lignite lower coal group lower group Mancos shale massive sandstone Mesaverde formation middle coal group middle group miles mouth Oak Creek outcrop Pilot Knob post-office probably prospects Quaker Mountain ridges Routt County sample sandstone and shale sandstone beds sandy seams show shaly slope stage road Steamboat Springs strata stratigraphic structural basin structure subbituminous syncline thick seam Tow Creek anticline tract Trout Creek sandstone Twentymile basin Twentymile Park Twentymile sandstone member U. S. Geol upper coal group upper group vicinity Wolf Creek Yampa field Yampa River Yampa Valley
Popular passages
Page 95 - The serial publications of the United States Geological Survey consist of (1) Annual Reports, (2) Monographs, (3) Professional Papers, (4) Bulletins, (5) Mineral Resources, (6) Water-Supply and Irrigation Papers, (7) Topographic Atlas of United States — folios and separate sheets thereof, (8) Geologic Atlas of United States — folios thereof.
Page 81 - After the face of the coal was cleaned of weathered coal and powder smoke a cut was made across the face of the bed from roof to floor, including all of the benches of coal mined and such impurities as were not removed in ordinary work. This cut was about 3 inches wide and 1 inch deep; the coal obtained from it, amounting to 25...
Page 41 - Dunkley post-office. Openings have been made on three seams, separated by stratigraphic intervals of about 35 feet each. The beds dip about 10° NW. The principal mine is on the uppermost of these three. An entry has been driven in on the coal for some distance and considerable coal has been mined for local use. The mine was not in operation at the time it was visited and a complete section could not be obtained. The exposed part of the bed is as follows: Section of upper coal bed at James mine....
Page 97 - B 293. A reconnaissance of some gold and tin deposits of the southern Appalachians, by LC Groton, with notes on the Dahlonega mines, by W.
Page 80 - ... at the chemical laboratory of the United States Geological Survey coal-testing plant, St. Louis, Mo. In determining the value of a coal from its chemical analysis, and also in comparing one analysis with another, it is important to know how the sample was taken, how it was treated after it was obtained, and how the analysis was made, especially the determination of moisture. In this work the samples were all collected and treated according to the following methods of sampling adopted by the United...
Page 81 - ... or 30 pounds, was caught upon an oilcloth blanket spread upon the floor of the mine so as to protect the sample from water and from admixture of shale and clay fragments that usually abound in such places.