the basin and range province extending across nevada, into western utah, and south into mexico now consists of n-s normal faulting due to crustal extension. if these normal faults show any extension in late eocene to early miocene, this could be evidence the sevier orogenic event collapsing after deactivation. thickening of the crust due to sevier and laramide faulting is thought to have led to current basin and range extension throughout the cenozoic. this could have caused the charleston thrust fault to reactivate as an extensional fault. the charleston transverse zone contained high angle faults which suggests it initiated as a response to connecting the low angle thrust faults of the sevier. the charleston transverse zone outlines a main sidewall ramp that would have been part of the sevier belt.