Big Rock (Okotoks erratic)
Okotoks Big Rock is a 16,500 tonne erratic. It is the largest in the Foothills train of erratics and was carried by a glacier and deposited in the middle of the prairie when the glacier melted more than 10,000 years ago. It is 9 m high and 41 m long and 18 m wide. It is 600 million year old quartzite. We used to let the kids climb it! Okotoks is the Blackfoot word for ‘rock’
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