Nine million years ago, the earth's crust broke into two retangular blocks along the Teton Fault, a 40 mile zone of weakness. Through sporadic movements the western block hinged skyward to form the Teton Range, while the estern block tilted downward to form the valley called Jackson Hole. The valley sank four times more than the mountains rose.Displacement continues and an an earthquake producing movement along the fault can occur at any time.
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