Abstract

Cross-bedding data are presented from 3 sharply restricted channel sandstones, in Oklahoma and Tennessee, from a Pleistocene deposit in Florida, and from the Pottsville sandstones of parts of Kentucky, Tennessee, Georgia, and Alabama. Modal vectors are shown to be more useful in certain instances for paleogeographic purposes than vector sums. Pottsville cross-bedding data appear to be essentially trimodal with the 3 modes at right angles to each other. The "minimum direction" is approximately the direction toward the Appalachian source land. Asymmetry of the data indicate that littoral currents flowed more readily toward the S than toward the N. A measure of dispersion (n/R) for modal vectors is used to produce a crude map of Pottsville regional slope in northeastern Alabama.

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