Image: Bigrock
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Description: Big Rock (glacial erratic). Big Rock (also known as Okotoks Erratic) is a glacial erratic situated between the towns of Okotoks and Black Diamond, Alberta, Canada (18 kilometres south of Calgary). The 15,000 tonne (16,500 short ton) quartzite boulder is one of the world's largest known glacial erratics.
Title: Bigrock
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Author: Coaxial at English Wikipedia
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