Ouimet Canyon Provincial Park – Ontario, Canada
The canyon is believed to have formed when a diabase sill dating from a billion years earlier was split open, either by the weight of advancing ice sheets or the large volumes of water released during their retreat. Erosion by wind and rain continued the formation of the canyon. A group of rare, arctic-alpine plants inhabit the valley floor.
Ouimet Canyon Provincial Park: http://www.ontarioparks.com/english/ouim.html
