...-bounding fault or localized subsidence in the basin, an event that is difficult to date directly. Two proxies are used to estimate onset: (1) start of conspicuous cooling estimated from thermochronology, assuming that fault-driven uplift is associated with erosional denudation, exhumation, and cooling...

... and subsequent extension. Geologic evidence for this assertion is provided by the juxtaposition of Proterozoic crystalline rocks with differing fracture-foliation fabrics and lithologies across both the Hurricane and Meriwhitica faults in the Grand Canyon ( Huntoon, 1981 ). The amount of right-lateral, strike...

... include the L-shaped Milkweed-Hindu channel on the central Hualapai Plateau and Peach Springs Canyon, the trunk valley coincident with the Hurricane fault ( Young, 1966 , 1979 , 1982 , 2001a ). The paleocanyons preserve the greatest buried relief at the plateau margin, 1200 m near Truxton, Arizona...

... Cliffs and the WGC provides a test to distinguish hypothesized ages of canyon incision. The data strongly suggest that carving of the WGC is younger than relief production due to slip on the Grand Wash fault ca. 18–12 Ma. Thus the geomorphic data are only fully consistent with the late Tertiary...