Enjoy a one hour hike through the rugged forested trails and explore the natural limestone caves where some of the movie Quest for Fire was filmed, but come prepared with GOOD hiking shoes with a good tread, as the rocks may be moist and slippery. You will also need a flashlight for some parts of the caves. Check out some of our Cave Photos and Video here. Binoculars will be a good idea to get a better view from the trail above the caves affords breathtaking views about 300 feet above the sparkling waters of Georgian Bay. Very important also is to have com­fort­able clothing when climbing around the caves.

     In the Great Lakes Region, there lies a huge depression in the earths crust, centered under the state of Michigan formed 400-500 million years ago. This was a time when North America was a tropical climate. On the outer edges of the depression lies two peninsulas, one on the west side of Lake Michigan and the other between Lake Huron and Georgian Bay called the Bruce Peninsula.

     Greig’s Caves are a small part of the rock of the Bruce Peninsula along the Niagara Escarpment which is very old and is home locally also to the Bruce Trail. Approximately 400 million years ago, this area was covered by a shallow tropical sea teeming with life in the form of plant-like animals, crustaceans, living corals and mollusks. It would have looked much like the present-day Great Barrier Reef of Australia. When the sea began to dry up, the minerals dissolved in it became more and more concentrated. Magnesium in the water was absorbed into the limestone, which then became a harder, slightly different sort of rock, called dolomite.

     The harder dolomite limestone forms much of the rock of the escarpment cliffs along Bruce Peninsula’s Georgian Bay shoreline. As at Niagara Falls, the dolomite "caprock" erodes more slowly than the rock below it, creating the sculptured cliffs for which the area is famous. The caves were formed by the wave action post­glacial Lake Algonquin over 7,000 years ago, as water levels in the region have undergone great changes. Softer limestone has been eroded away by water action, leaving magnificent overhanging cliffs at various points along the shore. Also inland, where erosion has cut more deeply, caves have been formed, such as Greig’s Caves, which are now located about 250 feet above Georgian Bay but were once at water level.