Okotoks Erratic
…pink, to purplish. Besides having been extensively fractured by frost action, it is unweathered. Big Rock lies about 8 km (5 mi) west of the town of Okotoks, 18 km (11 mi) south of Calgary in the SE. 1/4 of Sec. 21, Township 20, Range 1, West 5th Meridian. Big Rock is a glacial erratic that is part of a 930…