Silene acaulis (Moss Campion) flowers bloom on a mound of green foliage at rocky Dawson Pass in Glacier National Park, Montana, USA. Canada and USA share Waterton-Glacier International Peace Park, which UNESCO honors as a World Heritage Site. Rocks in the park are primarily sedimentary layers deposited in shallow seas over 1.6 billion to 800 million years ago. During the tectonic formation of the Rocky Mountains 170 million years ago, the Lewis Overthrust displaced these old rocks over newer Cretaceous age rocks.
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