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fault-block mountains Mountains or ranges that result from the upthrow of large fault blocks and that are separated from others by basins or troughs, producing an upland unit bounded by normal or reversed faults. It is classically developed in the Great Basin, Utah, USA, where a typical block is tilted and bounded by a steep fault scarp on one side and a by a more gentle dip slope on the other. Usually it is dissected by erosion. See BASIN-AND-RANGE PROVINCE; and HORST.