Sainte-Anne Falls In Canyon Sainte-Anne (Quebec, Canada) Series (18 Of 23) Stock Image

Some 450 million years ago, a sedimentary Palaeozoic sediment, a marine mud, was deposited in ancient seas on top of the gneiss, and consolidated into a rock called shale. The shale was metamorphosed into slate during the Acadian orogeny (a mountain building period 375 million years ago). Slate is a hard, resistant rock, able to withstand the erosive power of water.