Geology


Read the past as you view the Teton Range today. The ancient geologic processes that shaped the mountains and valley have left visible marks. Watch millions of years of dynamic geology unfold before you while exploring Grand Teton National Park.

Two rectangular blocks of the Earth's crust moved like giant trap doors, one swinging skyward to form the mountains, the other hinging downward to create the valley. Wind, rain, ice, and glaciers constantly eroded the rising range. Meanwhile, enormous glaciers and torrential meltwaters flowed southward carrying cobbles, gravel, and coarse sand and periodically releveled the floor of the sinking valley.

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