Grand Tetons, Yellowstone

Geologists regard the Teton Range as one of Earth’s most impressive examples of fault-block mountains. The blocks forming the Tetons and Jackson Hole are joined at the Teton Fault, along which movement is estimated to average about one foot per 300–400 years. Although the Tetons are the youngest mountains of the Rocky Mountain chain, they contain some of its oldest rocks, dating back about 2.8 million years. Piedmont lakes rimmed by moraines from the last glaciation are adjacent to the range.

~ by sternbo on August 25, 2009.

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