Four bentonite and two shale samples from the Upper Cretaceous Belly River Formation at Bow River near Calgary were studied by X-ray spectrochemical analyses and by Fourier analyses of the clay minerals. Little difference obtains in the chemical compositions of the bentonites and of the shales. The relative amounts of different clay minerals of the bentonites may be diagnostic of the bentonites and useful for correlation; these clay minerals include mixed-layer clays of vermiculite/montmorillonite/illite layers showing tendency to long-range ordering. In the shales, mixed-layer clays are absent but kaolinite is more important.

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