What Stories Do Rocks Tell?
ES2903  Folded Layers

The Sangre de Cristo Mountain Range is part of the Rocky Mountains in Colorado and New Mexico. The Gibson Peak syncline—a fold shaped like the letter U—is visible in this photograph. Examine the photograph to identify the folded rock layers.

  !   What story does folded rock tell? Imagine the processes responsible for forming the folds. Click the image to see an animation showing how folds form.

USGS/Tom Grace, TERC
Folded layers in the Sangre de Cristo Range of Colorado.

6. What type of force was applied to these rocks to form folds?

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