What Forces Created These Geologic Features?
ES1106  Basin and Range

The Basin and Range geologic province of the western United States is an example of a horst and graben mountain system. Formation of Basin and Range mountains began approximately 16 million years ago and continues today. This outcrop is exposed in the Basin and Range province.

  !   Interpret the fault in a manner similar to the two examples you just saw. Use the drawing tools to label one or more layers cut by a fault, then trace the fault. Identify the hanging wall and footwall, then draw arrows to indicate the direction of stress. Answer the questions below.

Martin Miller, University of Oregon


3. Describe how you deduced the direction of stress that formed this feature.

4. What can you infer about the forces that built the mountains of the Basin and Range province?


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