[1] The fault was a reverse fault in the Early Cretaceous epoch during the primal stages of the Farallon plate subduction beneath the North American Continental Plate and fully transitioned into a strike-slip shear zone during the Late Cretaceous.
[1] Her research continued into 2010, which explicitly entailed the lines of evidence that overturn the proposition that the fault was inactive for more than 3.5 million years.
The Kern Canyon Fault Zone is a north-striking feature that harbored pre-Quaternary crustal deformation such as right-lateral strike slip and east-down normal displacement.
The late-Quaternary active Kern Canyon Fault extends the ~150 km (99) miles from Walker Basin past Harrison Pass.
The Kern Canyon fault, according to the early study of Webb, is made up of 90 percent of granodiorite (a phaneritic-textured intrusive igneous rock similar to granite[5]) and although densely covered by soils and brush, Webb discovered traces of sheared breccias and mylonites in specific zones along the fault.