The Niagara Escarpment   The Great Wall The Niagara Escarpment extends 700 Kms. from Niagara Falls to Tobermory, where the 200 foot cliffs plunge into the depths of Georgian Bay, only to reappear as islands such as Flowerpot and Manitoulin. This formation is part of an extensive geological phenomenon known as Barrier Reefs. Formed mainly by colonial tabulate coral during…