Erratic Rock (Big Rock) is a historical site and sightseeing attraction located west of the community of Okotoks. The rock is the largest boulder on the Foothills Erratic Train.

- Trailhead
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Information signs greet visitors to Big Rock located west of the community of Okotoks, Alberta, Canada. - Trail of Big Rock
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The pathway leads to the rock and then loops behind the rock and back to the parking lot. - rock20090626 76012
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The pathway leading to Erratic Rock which is located west of the community of Okotoks, Alberta, Canada. - Entrance Information at Big Rock
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At the trailhead entrance to the Erratic Rock there is an information sign. - Big Rock
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A chunck of rock left behind from the Ice Age known as Big Rock is located west of the community of Okotoks, Alberta, Canada.