The combined study of a detailed aeromagnetic survey and available geologic, seismic and other geomagnetic data has indicated the presence of grabens, perhaps of late Paleozoic or early Mesozoic age. The study suggests the presence of salt, defines 3 important trends associated with Appalachian or post-Appalachian orogeny, and appears to support the present concepts of plate tectonics, although this latter point has not yet been studied in detail. Much of the information has been interpreted from detailed aeromagnetic data.

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