National Geographic Daily News

Mount Rundle, Banff

Photograph by George F. Mobley

Mount Rundle in Banff, Alberta, Canada, at 9,838 feet (2,999 meters) is mostly made up of limestone from the Mississippian Age. In North America the Carboniferous period is divided into the Mississippian (Lower Carboniferous) and the Pennsylvanian (Upper Carboniferous). This system was adopted to distinguish the coal-bearing layers of the Pennsylvanian from the predominantly limestone Mississippian.

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