Normal faults extend the crust in a direction perpendicular to the fault trace. Because the hangingwall moves downward, normal faults place younger rocks over older rocks.
Normal faults may dip at a variety of angles, but they most typically dip between about 40 and 70 degrees. Some normal faults dip at angles as low as 10 degrees or less. These low-angle normal faults pose especially interesting problems for structural geologists.
To faults, thrust faults, strike-slip faults
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