Abstract
Detailed study of the clay mineralogy of portions of the Kope and Fairview (Cincinnatian) Formations, of Cincinnati, Ohio, reveals a suite composed of illite, chlorite, vermiculite, and some mixed illite-montmorillonite. In the vicinity of the Kope-Fairview contact the relative amounts of chlorite and vermiculite decrease, and then show some increase near the top of the Fairview. Comparisons with paleocurrent data show a correlation between dominant current directions and chlorite-illite ratios, and suggest a stronger easterly source for the Kope and a slightly greater influx of northern sediments for the Fairview.
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