Campbell Mountain, an 8,249-foot peak in Glacier National Park’s Livingston Range in northern Montana, rises above the west shore of Waterton Lake and more than 4,000 feet above the water near the international border. Named for Archibald Campbell, who helped map the border between the United States and Canada, it reflects the park’s larger geologic story. Its sedimentary rock was deposited from the Precambrian through the Jurassic in ancient shallow seas, then lifted and displaced during the Lewis Overthrust beginning about 170 million years ago, when older Precambrian rock was pushed over younger Cretaceous rock. The mountain lies in an alpine subarctic climate with long, snowy winters and cool to warm summers.