Orogenic Times of the Northern Appalachians
Introduction It has long been clearly established that the Paleozoic formations of the Appalachian geosyncline from Alabama to New York were made into mountains at some time after the early Permian, and this unanimity of opinion has led most geologists to conclude that this orogeny was continued from New Jersey to Newfoundland. On the other hand, the fact that the pioneer geologists of eastern Canada had clearly demonstrated that the Acadian part of the Appalachians was folded in the main during the Devonian, with other orogenic times at the close of the Ordovician and during the late Carboniferous (close of Mississippian= Windsor and during the Pennsylvanian), has never taken rootage among the geologists of the United States as it should have. Accordingly, the opinion is still widely held that even the great Champlain-Saint Lawrence overthrust was made toward the close of the Paleozoic, although Logan as early as 1863 had . . .