A broad, Cenozoic continental rift that has affected a portion of the western United States in Nevada, Utah, and Arizona.
a geographic area extending from southern Oregon and Idaho to northern Mexico, and including most of western Arizona, the Great Basin of Utah and Nevada, and parts of eastern California. It is an area characterized by north-south trending mountain ranges interspersed by flat basins. The area was formed initially through block faulting during Tertiary times (15-20 million years ago), when, in a series of earthquakes, one section of land was lifted while the adjacent portion was lowered.
A geographic region characterized by parallel mountain ranges separated by flat valley floors which extends from the Wasatch Front in Utah to the Sierra Nevada mountains in California, and from Mexico north to Oregon and central Idaho