 A large part of the island of Newfoundland is an extension of the Appalachian system.Major bays, peninsulas, river systems and mountain ranges are typically oriented southwest to northeast, parallel to the Appalachians.The eastern part of the island (the Avalon Peninsula and Burin Peninsula) is mostly folded sedimentary rocks with some intrusions of igneous rock and was part of southwestern Europe or Northern Africa about 250 million years ago.