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An intercalation of coal seams in sedimentary sequences suggests accumulation in a nonmarine environment with a high watertable, (e. g. alder swamp, or lacustrine or fluvial setting) and/or in a near-shore marine environment, (e. g. swamp or salt-marsh) . Continental basins with low watertables and strong oxidizing conditions such as desert, are characterized by the presence of ferric oxide and the lack of organic matter. Such oxic environments do not allow coal formation, because of a scarcity of vegetation (Berner, 1981, 1984). An open-marine environment is also unsuitable for coal accumulation, owing to dispersion of(transported plant debris in wide water areas for one thing, and decomposition of precursive organic matter under oxidizing conditions. Consequently, a geochemical discrimination of non-marine and near-shore paleoenvironments containing coal is geologically important. Several geochemical parameters have been proposed for characterizing the sedimentary environments of coals (Teichmuller and Teichmuller, 1982) . This paper presents a new method for rapid environmental analysis of sedimentary basins using carbon/nitrogen (C/N) ratios and the pyrite content in coal.

A method for rapid analysis of sedimentary environments based on C, N, S, and pyrite content in coals