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- W48195645 abstract "The stratigraphic units overlying the Late Ordovician red-bed sequence in the central and southern Appalachians can be grouped into a Heterolithic Lithosome (HL) and a White Sandstone Lithosome (WSL). In the central Appalachians the WSL is dominant, whereas in the southern Appalachians the HL is dominant over the WSL (Poor Valley Ridge Ss=PVR=upper member of the Clinch Ss). In the southern Appalachians the HL commences in the latest Ordovician with the mid-Hirnantian eustatic sea-level rise due to ablation of Saharan glaciers. The PVR is encased within the HL and thins to the NW and SW. On grounds of higher textural and compositional maturity, color, coarser grain size, higher sand content, and degree of bioturbation the PVR is clearly distinguishable from the underlying Hagen Sh. (HS). Both members of the Clinch Ss. were deposited in storm-dominated shallow marine environments. During a lull in Taconic compressional tectonism isostatic basin rebound converted the Taconic foredeep from a sediment sink into a sediment exporter. The erosional detritus was shed toward the SW, remodeled by storms into NW-migrating subaqueous dunes, and deposited as the lower progradational part of the PVR. This phase of re-establishment of the Taconic foredeep as a sediment sink corresponds to themore » upper retrogradational part of the PVR in the southern Appalachians. The WSL in the southern and central Appalachians is capped by the Rose Hill F. brought in by the early Telychain eustatic sea-level rise. Deposition of the PVR in the southern Appalachians correlates with a lacuna and deposition of UT in the central Appalachians. The WSL was directly influenced by Taconic tectonism, whereas eustasy was the prime influence on the HL.« less" @default.
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- W48195645 date "1992-01-01" @default.
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- W48195645 title "The ups and downs of Virginia: The Taconic foredeep as sediment sink and sediment exporter" @default.
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