The Tuscarora Sandstone (Clinch equivalent) is a basal Silurian orthoquartzitic sandstone prominently exposed in the Valley and Ridge province of western Virginia. Directional analysis of paleocurrent structures and grain size distribution indicates that the Tuscarora-Clinch clastic material was deposited on a paleoslope that dipped uniformly northwestward. The provenance area was an extensive line source located in the Blue Ridge–Piedmont complex eastward of the present outcrop belts. The basin-source contact (paleo-fall line) for the Tuscarora-Clinch deposits was evidently situated some 80 km farther east of the present Valley and Ridge–Blue Ridge boundary prior to late Paleozoic folding and faulting.

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