• The Cathedral Group from the Teton Park Road

    Grand Teton

    National Park Wyoming

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  • Bears are active in Grand Teton

    Black and grizzly bears are roaming throughout the park--near roads, trails and in backcountry areas. Hikers and backcountry users are advised to travel in groups of three or more, make noise and carry bear spray. Visitors must stay 100 yards from bears. More »

  • Multi-use Pathway Closures

    Intermittent closures of the park Multi-use Pathway System will occur through mid-October during asphalt sealing and safety improvement work. Pathway sections will reopen as work is completed. Follow the link for a map and more information. More »

  • Moose-Wilson Road Status

    The Moose-Wilson Road between the Death Canyon Road and the Murie Center Road is currently open to all traffic. The road may re-close at any time due to wildlife activity. For current road conditions call 307-739-3682. More »

Geologic Activity

The Teton Range rises out of the valley floor
The Teton Range rises out of the valley floor due to motion on the Teton fault.

Imagine visiting Grand Teton National Park 100 million years ago. You would see a much different landscape. Stretching before you would be a great sea depositing layers of sediment on top of 2.5 billion-year-old granite and 2.7 billion-year-old gneiss. Jump forward 30 million years; those seas have retreated, and the collision of tectonic plates begins to up-lift the Rocky Mountains. Another 60 million years pass before a different type of geologic force creates the Teton Range.

The Teton fault extends 40 miles along the base of the Teton Range. About ten million years ago, this region began to stretch and the Earth's crust cracked forming faults. Each time the crust broke; an earthquake up to magnitude 7.5 shook the land tilting the mountains skyward and dropping the valley floor. These sporadic bursts of energy created the abrupt front of the Teton Range as it towers above Jackson Hole. At 13,770 feet, the summit of the Grand Teton rises 7,000 feet above the valley floor. Total vertical displacement across this fault may be up to 30,000 feet. The floor of Jackson Hole may have dropped over 20,000 feet, roughly three times as much as the mountains rose. The jagged skyline, vertical relief and lack of foothills make the Teton Range a sight to behold.

Beginning two million years ago, glaciers repeatedly scoured and sculpted the Teton landscape. Large masses of ice flowed from the topographic high of the Yellowstone Plateau down across the valley of Jackson Hole numerous times leveling the valley floor. At the same time, alpine glaciers flowed down from the high peaks carving U-shaped canyons and gouging out valley lakes. Grand Teton National Park contains many features created during the ice age such as piedmont lakes, U-shaped canyons, knife-like ridges, kettles, and moraines.

Grand Teton National Park today boasts dramatic vistas and a geologic story that is by no means complete. Geologic forces such as erosion and glaciation still sculpt the landscape and a major earthquake will occur in the future. The last major earthquake happened roughly 5,000 years ago, but the fault will lurch into action once again. Imagine a rubber band stretched to its limit; sooner or later it will break. For the Teton fault, it is not a matter of if, but when, it will move again.

Discover Grand Teton

Discover Grand Teton allows viewers to explore the geology of the region through a timeline, earthquakes, rocks and forces.

Greater Yellowstone Science Learning Center

The Greater Yellowstone Science Learning Center is a portal to information about the natural and cultural resources of Yellowstone and Grand Teton (including John D. Rockefeller, Jr. Memorial Parkway) national parks and Bighorn Canyon National Recreation Area.

What's shaking in the Intermountain West (Montana, Idaho, Wyoming, Nevada, Utah, Colorado, Arizona and New Mexico)? Visit the "Recent Earthquakes in the Intermountain West" website to learn about recent earthquakes in the area. The site provides local magnitude, times of occurrence and proximity to local towns and cities.

Read the park's geology brochure for more information.

Watch four video podcasts: general overview, Mount Moran, Teton Fault and Glaciers; and a geology animation clip to experience the forces that shaped this landscape.

Did You Know?

Close-up of a lodgepole pine cone

Did you know that lodgepole pine trees grow on glacial moraines in Jackson Hole? Glacial moraines are ridges of rocky debris left behind as Ice Age glaciers melted. The soil on these ridges retains moisture and is more hospitable to trees than the cobbly, porous soil on the outwash plain.