Many notable structural and geophysical features are found in a northwest- trending band that extends from South Dakota to South Carolina. This band, herein termed the Dakota-Carolina corridor, is delineated by the location of folds, faults, and igneous intrusions; the termination or offset of rift axes; the localization of Mississippi Valley-type ore deposits; patterns of geophysical anomalies and of contemporary seismicity; a change in seismic reflectivity of the upper crust; and a change in basement rock composition. We expand on earlier models and propose that the corridor reflects a Cratonic weak zone in North America, which possibly originated in the Precambrian as the boundary between distinct crustal provinces. Reactivation of the corridor during the Phanerozoic localized subsequent deformation and fluid flow, perhaps even in the Appalachian orogen.

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