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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"Correlation by Spectrographic Analysis of Bentonite in the Gulf Series of Dallas Area, Texas,"
Field and Laboratory: Vol. 25
Available at: https://scholar.smu.edu/fieldandlab/vol25/iss1/1