. . "Appalachian Region, Southern." . . . "West-to-East (Break-back) imbrication of the Alleghenian allochthon in the Southern Appalachian Plateau and Valley and Ridge"@en . "West - to - east (break-back) imbrication of the Alleghenian Allochthon in the southern Appalachian plateau and valley and ridge"@en . . . . . . . . . . . . . .