Extensive road cuts along Interstate Highway 77 north of Charlestown, West Virginia provide exposures of lateral variation in the upper Monongahela and lower Dunkard Groups (Permo-Carboniferous). The limited lateral extent of individual lithologies and of the cyclothems they define demonstrate that the cyclicity is of local (autocyclic) origin generated primarily by infrequent diversion of the main channel belt and secondarily by periodic crevassing and lateral migration of the channel belt. No evidence appears for external (allocyclic) generation of cyclicity by eustatic, tectonic or climatic mechanisms.

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