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Field Description and Characterization of Coals Sampled by the Oklahoma Geological Survey, 1971–1976
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During a five-year period (1971–1976) 147 channel and 92 core samples representing 15 individual bituminous coal beds in Oklahoma were collected and characterized using megascopic petrographic terms. The average coal contains sparse (< 15 percent) to moderate (15 to 30 percent) and thin ( to 2-mm) bands of vitrain, and moderately bright attritus. Channel samples are reliable but not as preferable as core samples, because constant depth and width of the sample is difficult to obtain from channel samples. The channel samples are convenient to utilize for standard proximate, calorific, sulfur, ultimate, and ash fusion analyses. Analyses from the same coal face remain to be compared, and examination of lateral and vertical variations of the coal bed character should be undertaken.
coal, samples, partings, megascopic, physical properties, vitrain, fusain, attritus
Coal geologist, Oklahoma Geological Survey, The University of Oklahoma, Norman, Okla.