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- W84638324 abstract "The Tuscarora Sandstone (Upper Ordovician-Lower Silurian) forms part of the Martinsburg-Shawangunk clastic wedge, which represents the fill of a peripheral foredeep formed during the Taconic orogeny in the central Appalachians. The Tuscarora Sandstone is split into the lower Tuscarora Sandstone (LT) and the upper Tuscarora Sandstone (UT) by the regional Tuscarora Unconformity (TU). The TU formed by isostatic basin rebound during a lull in Taconic compressional tectonism. The LT interfingers with red beds of the upper Juniata Fm., and caps a coarsening-upward trend which commenced within the Martinsburg Fm. The LT is dominated by high-angle cross-stratified sandstone with arthrophycus, Planolites, Cruziana, and abundant Rusophycus, Monocraterion, and Skolithos traces. The coarser-grained sandstone beds represent subaqueous dunes deposited in a storm-dominated shallow-marine environment. Interbedded mudstone represents fairweather deposits. Present-day distribution and thickness of the LT is governed by original depositional geometry and by erosional removal beneath the TU. The UT is bounded at its base by the TU and at its top by a marine flooding surface marking the onset of deposition of the Rose Hill Formation. The UT is composed of: (1) basal, cross-stratified, gravelly sandstone representing uppermost upper shoreface deposits; (2) high-angle cross-stratified sandstone representing storm-enhanced rip-current deposits of themore » upper shoreface; (3) hummocky cross-stratified sandstone representing storm deposits of the middle and lower shoreface; (4) dark-colored fine-grained mudstone to sandstone representing fairweather deposits of the upper shoreface. The storm-dominated shoreface deposits of the UT constitute a retrogradational parasequence formed during a tectonically induced relative sea-level rise. To the southwest of Wytheville, VA, the TU and LT disappear, and the white quartzarenite is more appropriately designated as Clinch Sandstone.« less" @default.
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- W84638324 date "1993-03-01" @default.
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- W84638324 title "The Tuscarora Sandstone is marine--At least in southwestern Virginia" @default.
- W84638324 hasPublicationYear "1993" @default.
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