Abstract

Dip orientations of 202 crossbedded units at 7 localities in Sylvania Sandstone yielded modal directions toward the north and west. Grain orientations obtained from 25 thin sections agree with the crossbed orientations. Both coincide with the directions of regional paleoslope and decreasing stratigraphic hiatus. Marine fossils and other evidence suggest a marine depositional environment. The presence at some locations of strong secondary modal crossbed orientations at 180 degrees from the primary mode suggests marine transgression in a beach environment.

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