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Metamorphic Rocks—Why Rocks Bend And Fold, Part 3: Complimentary Evidence

Run Time: 00:05:59

In this third of three video clips, the collision of the North American and African Plates, 500 million years ago, drove the Green Mountains skyward. This scenario helps explain the enormous pressure that would change the sedimentary rock at Clay Point into metamorphic rock. Geologist Keith Klepeis, of the University of Vermont, uses Lone Rock, another outcrop on Lake Champlain, as evidence that the formation of the Green Mountains also caused folding, faulting, and breaking of rock—even miles away. Lone Rock is unusual in that the older rocks are on top. Klepeis explains how pressures at Lone Rock were powerful enough to fault and thrust older sections of rock on top of younger sections. Lone Rock is one more bit of evidence that the rock at Clay Point most likely folded as a result of immense pressure exerted during the formation of the Green Mountains. Featured Scientist: Keith Klepeis, Ph.D.


NSES Standard

Grades 5-8 Standard D. Crustal plates constantly move in response to the movements of the mantle.


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