A fault in the continental plate near lat 40°N is inferred from a series of extensive east-west faults mapped through the Blue Ridge, Great Valley, and Valley and Ridge and extended across the Appalachian Plateau on the basis of geophysical and subsurface evidence. This structure, named the Transylvania fault, may relate to the previously proposed Kelvin fault on the oceanic plate. The Cornwall fault originally linked with the Kelvin fault does not exist.

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