Samples from four cored wells in central Alberta were studied by X-ray fluorescence and diffraction methods in order to determine the chemical composition and mineralogy of the Upper Devonian Ireton and Duvernay Formations. The results are presented as both chemical and mineralogic logs of the cores. The dominant minerals throughout are illite, chlorite, quartz, dolomite and calcite. Vertical variations are extreme, with rocks ranging from pure carbonate to those with about 25 percent carbonate and the remainder consisting of the silicates. Individual stratigraphic units show no significant lateral variations across the basin. Both local and regional implications of the data are discussed.

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