Fractures in the Earth's surface, a procedure referred to as taphrogeny, result in formation of fault-block mountains.
If there are two similar faults, the crustal block between them may either rise to produce horst-block Mountain or fall to make a rift valley.
A fallen block is recognized as a graben. The term block mountain may be practical to skewed fault-block and complex faulted uplands.
Block Mountains be in countries like Nevada, Utah, and Arizona, anywhere they appearance basin-and-range landscapes.
Uplifted blocks may have younger casing formations stripped off them, leaving relict landforms as in the Harz and Black Forest terrains of Germany and in the Massif Central of France.
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