3D Models of Okotoks Erratic, Canada

The Okotoks Erratic, commonly known as Big Rock, lies about 7 kilometers west of Okotoks, Alberta. This quartzite boulder, weighing some 16,500 metric tons, is one of the world's largest known glacial erratics, rocks carried far from their source by moving ice. Researchers believe it broke away from a mountainside in the area of today's Jasper National Park and was carried hundreds of kilometers south between 12,000 and 18,000 years ago, along the meeting zone of the Cordilleran and Laurentide ice sheets that covered most of North America. Thousands of similar boulders are scattered across Alberta and Montana along what is known as the Foothills Erratics Train, and tracing them back to their parent bedrock confirms the routes of ancient ice flows.

More about Okotoks Erratic