Geology
The geology of the park is dominated by mountains made up of exposed faulted sedimentary rock and valleys containing glacial till deposited in the Pleistocene. Just outside the north-western corner of the park, there is an igneous intrusion known as the Ice River Complex containing deposits of sodalite, an ornamental stone. The hills immediately around the hot springs are composed mainly of tufa, a calcium carbonate deposit that forms by precipitation of supersaturated hot spring water when it reaches cooler surface water. The rocks in south-western corner of the park are part of the older Purcell Mountains range while the eastern park mountains are part of the younger Rocky Mountains range.
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