Uncover the dramatic geological forces that shaped the towering Teton Range and the valley of Jackson Hole over billions of years.
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The Rockies' Youngest Range Still Rising
This is Mountains of Time, a series about the geological story written into every peak and valley of Grand Teton National Park.
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1
Ancient Rocks Beneath the Teton Peaks
The rock at the core of the Tetons is nearly 2.7 billion years old — formed when the Earth was barely half its current age and the atmosphere held almost no oxygen.
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Ice Age Forces That Shaped Everything
The flat floor of every major valley here is a signature left by ice.
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Granite Spires and Dark Stone Ribbons
The Grand Teton's summit is composed of a light-colored rock called gneiss laced with granite, and this combination is what gives the peak its pale, almost luminous…
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4
Jackson Hole Sinks as Tetons Rise
The valley floor of Jackson Hole has dropped roughly four miles relative to the Teton summit since faulting began.
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