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The preceeding chapters in this book constitute syntheses of our knowledge of the tectonic history of the U.S. Appalachians following their inception as a rifted and passive margin after the Grenville orogeny to the present state of decay. The purpose of this chapter is to summarize the evidence for the major events of the Paleozoic and later history of the Appalachians, to bring to light similarities and differences between along-strike segments, and to explore aspects of Appalachian history from the perspective of the tectonic map (Plate 1) that may not have been brought out in the previous chapters. This, as all syntheses, represents only a progress report whose total complexion may change with the appearance of new data. Details of stratigraphy and structure were outlined in previous chapters.

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