What Forces Created These Geologic Features?
ES1106   Faults and Folds

Formation of mountains is a direct result of plate tectonic activity. Geologic structures such as faults, folds, and layering found in mountains can be used to infer the type and direction of plate tectonic stresses in both ancient and presently active mountains.

Matthew Nyman, TERC Martin Miller, University of Oregon
Folded metamorphic rocks in Wyoming. Note the camera lens cap for scale. Folds and faults in the Klamath Mountains of Oregon. Note the rock hammer for scale.
Matthew Nyman, TERC NASA
Tilted sedimentary rocks in the Canadian Rockies. Note the person in the red circle for scale. Large-scale folding is apparent in this satellite image of the Appalachian Mountains, Pennsylvania.

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