Abstract

Sediment dispersal patterns of the Lower-Silurian Tuscarora Quartzite and Upper Ordovician Juniata and Bald Eagle formations were mapped in the Central Appalachians. Cross-bedding was the principal sedimentary structure utilized. Thickness, lithofacies, maximum pebble size, petrographic and fossil data, together with the cross-bedding, establish the Tuscarora depositional framework. These data enable one to locate the edge of the sedimentary basin and the shore line. Between these two limits the Tuscarora was deposited by largely fluvial processes.

The Tuscarora pattern of sediment dispersal is similar to patterns determined from less complete data of the underlying Juniata and Bald Eagle. The Tuscarora records fluvial deposition probably initiated in Bald Eagle time, and the principal change from deep-water to shallow-water sedimentation occurred between Bald Eagle and Martinsburg time.

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