A Restless Earth

A Restless Earth. . , A Restless Earth , Powerful geologic forces are uplifting the steep Teton Range in front of you and dropping the valley of Jackson Hole. , The same subterranean heat that fuels Yellowstone's geothermal features helps lift and stretch the entire region, producing the Teton fault and the Yellowstone Plateau., Teton Fault , About ten million years ago, the Earth's crust began stretching and cracking , generating many earthquakes on the Teton fault. Each earthquake tipped the Teton Range steeply upwards, while the Jackson Hole valley hinged downward. , , Steep slopes along the base of the mountains - called - faults scarps - provide evidence pf this process. , A Sea of Ice , About two million years ago, glaciers began flowing off the Yellowstone Plateau and down from mountain canyons. Like slow moving rivers, these glaciers buried the Jackson Hole valley under several thousand feet of ice., From this vast icy expanse the highest Teton peaks jutted up like jagged islands. , Out Of Place , Ever Notice large boulders out ofplace or landscape ? These may be glacial erratic rocks that fell on the ice or were plucks on canyon walls. , As glaciers move, they carried debris for miles along a conveyor belts of ice. Glacial erratics are deposited across the land as ice melts.