Tectonic Lithofacies Map of the Appalachian Orogen.  Compiled by renowned Newfoundland Geologist Harold “Hank” Williams with the assistance of his student Jim Hibbard.   Copyright 1978 by Memorial University of Newfoundland.

Note that the Appalachians of the Ancient Continental Margin of Eastern North America are referred to as the “Humber Zone” after Western Newfoundland’s Humber Arm and Humber Valley, geographic center of the Humber Arm Allochthon.