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1 Fault-block mountains-Fault-block mountains are formed along faults where some large blocks of rock are forced upwards while others are forced down. 2  The higher area is sometimes called a horst and the lower a graben (see the picture below).
It has long been recognized that the Sierra Nevada is an upfaulted, tilted block of the Earthâs crust. A major fault zone bounds the block on the east, and it was along this that the great mass that became the Sierra Nevada was uplifted and tilted westward. This explains the asymmetry of the range.