" The Big Rock " Is The Worlds Largest Known Glacial Erratic Rock Tran ...
Stockphoto ID: 3608914
File name: 2456651-10411.jpg
Format: digital, 4000+ pixels longest side
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Source: photographer Based in: United States
Description: " The Big Rock " is the worlds largest known glacial erratic rock transported far from its place of origin by glacial ice . Big Rock , also known as the Okotoks Erratic , is the largest rock in the Foothills Erratics Train , a group of rocks that were carried by ice along the mountain front and dropped as the glacier melted some 10 , 000 years ago . The erratics lie in a narrow band extending from Jasper National Park to northern Montana . The Okotoks Erratic weighs 16 , 500 tons . It measures 9 metres high , 41 metres long and 18 metres wide . The rock has been eroded into pieces , but is still a large landmark on the flat prairie .