Figure 29 - Block diagrams showing pivoting and translation of the southern Appalachians around the central Appalachians in the Johnson City, Tenn., area Figure 29. Block diagrams showing pivoting and translation of the southern Appalachians around the central Appalachians in the Johnson City, Tenn., area. Arrows show direction of relative movement of upper block. A, Strike-slip-faulted basement with future décollement surface shown by heavy dashed line. B, Rotation of basement block on décollement surface. C, Translation of the basement and cover sequence. Plunging folds developed over the lateral ramp that is, in turn, formed over strike-slip faults. Note that erosion of the cover sequence high above the décollement will leave folded cover rocks in the Valley and Ridge province, but farther south and east in the Blue Ridge or Piedmont province, erosion closer to the décollement will expose the root zone of the basement. The basement strike-slip faults will then appear as lineaments, as near Kingsport, Tenn.

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