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The Pennsylvanian rocks of the central Appalachians record a progressive change in paleogeography and paleoenvironment, from extensive sea (Pottsville time), to relatively small bay (Allegheny–lower Conemaugh time), to entirely river-influenced lowsalinity bay-lake (upper Conemaugh–Monongahela time), to relatively small lakes of fluvial plain (Dunkard time). Sediments derived mainly from the southeast were dispersed into the elongate sea-bay-lake by prograding deltas. Sediments first filled the unstable geosynclinal trough-basin of southern West Virginia, and then the northeast-trending Dunkard basin of northern West Virginia which developed as a depression in a relatively stable platform. Sea transgression during Conemaugh time was in part tectonically controlled,...

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