Some more good research material here.
This is a very neat series of landforms just outside of Las Vegas and much of The Great Basin of Nevada. I remember seeing some features like this on my road trip from vegas earlier this year. There is some really neat stuff out there and very old.
Polyphase Laramide Orogeny? Have not heard of this term before!
http://www.sunsetcities.com/Red-Rock-Canyon/keystonethrust00.html