The Government of Ontario has erected a plaque in Tobermory about the geography of the area. The first, at the tip of the peninsula, titled ESCARPMENT SUBMERGENCE, provides this information: "This shoreline marks the northern extremity of the Niagara Escarpment in southern Ontario. Stretching unbroken for 465 miles across southern Ontario from Niagara Falls. The escarpment was created by erosion of layered sedimentary rocks deposited in ancient seas of the Paleozoic Era over 400 million years ago. Portions of the escarpment form the islands between Tobermory and South Baymouth and the same Paleozoic rocks shape the geology of Manitoulin Island."