Big Rock (glacial Erratic)
Big Rock (also known as Okotoks Erratic) is a glacial erratic situated 7 km (4.3 mi) west of the town of Okotoks, Alberta, Canada (18 km (11 mi) south of Calgary). The 15,000 tonne (16,500 short ton) quartzite boulder is the world's largest known glacial erratic.
Read more about Big Rock (glacial Erratic): History, Present Day, In Popular Culture
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