Core complexes are enigmatic and have gotten a lot of attention from geologists in recent years.
I would go to South Mountain in Phoenix, after reading what Steve Reynolds has written about it. The Whipples are a must. Snake Range is historically important and still controversial. The Raft Rivers give a sense for the core complexes way up north.
Some recommended authors:
George H. Davis Gary Axen (detachment faulting) Jon Spencer Gordon Lister Greg Davis, Steve Reynolds Art Snoke John Platt Peter Coney ...
Feedback? Questions? Drop me a line!Tom's Geology Info / tom@mmto.org