Figure 3. Small folds in the sedimentary layers were produced when the rock was deformed during metamorphism. Layers which originally were flat and straight are now tilted and curved. The shapes of these particular folds indicate that the rock was shortened in a northwest-southeast direction (left to right in the photo) as a result of pressure. Highlight folds. (MGS photo by Henry Berry.)

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Last updated on January 4, 2008

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