Field and Laboratory


Eugene Herrin

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Spectrographic determination of Si:Al and Ca:Mg ratios in bentonite from the Upper Cretaceous Eagle Ford shale of the Dallas area, Texas, indicate that variations in these ratios among different bentonite beds are significantly greater than variations within a single bed. The correlation of one bed over a distance of about 9 miles is supported by both spectrographic and stratigraphic evidence. Correlation of bentonite in the Dallas area with similar beds near Waco, Texas, 120 miles to the south, now seems possible. If so, the Eagle Ford shale might be divided into time-rock units that would be independent of paleontology.

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This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License

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