The NYC Region - map of the Appalachian Mountains region

Map of the Appalachian Mountains region showing the outcrop belts of the "Sedimentary Appalachians" (also called the Appalachian Basin, and represents a vast region underlain by Paleozoic sedimentary rocks), and the "Crystalline Appalachians" (underlain chiefly by Precambrian and Early Paleozoic metamorphic and igneous rocks).