This massive angular boulder, which is broken into two main pieces, measures about 41 by 18 metres (135 by 60 feet) and is 9 m (30 ft) high. It consists of thick-bedded, micaceous, feldspathic quartzite that is light grey, pink, to purplish. Besides having been extensively fractured by frost action, it is unweathered. Big Rock lies about 8 km west of the town of Okotoks, Alberta, Canada, 18 km south of Calgary in the SE. 1/4 of Sec. 21, Township 20, Range 1, West 5th Meridian
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