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Graben: An elongate trough or basin, bounded on both sides by high-angle normal faults that dip toward the interior of the trough. It is a structural form that may or may not be geomorphologically expressed as a rift valley. (Definition from Jackson, J.A., ed., 1997, Glossary of geology [4th ed.]: Alexandria, Va., American Geological Institute, 769 p.)

 

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Last modified September 11, 2008 .