Grand Teton National Park. Towering more than a mile above the valley known as Jackson Hole, the Grand Teton rises to 13,770 feet above sea level. Twelve Teton peaks reach above 12,000 feet elevation, high enough to support a dozen mountain glaciers. In contrast to the abrupt eastern face, the west side of the range slopes gently, showing the angle of tilt of the Earth's crust. Youngest of the mountains in the Rocky Mountain system, the Teton Range displays some of the North America's oldest rocks. A publication is available on Geology.
