Last updated: November 7, 2021
The Teton Range appears unchanging, but the opposite is true. The rocks found in the mountains formed hundreds of millions to billions of years ago. Movement on the Teton fault generated earthquakes that began to lift the mountains less than 10 million years ago. Ice age glaciers carved canyons and lakes. All the while, erosion due to water, wind and ice continue to sculpt the range, and any day another earthquake could violently change the landscape.