geology of the SW  US by John McPhee - Basin and Range, and Annals of the Former World-

Annals of the Former World, -McPhee’s tetralogy on geology, was published in a single volume in 1998 and was awarded the Pulitzer Prize in 1999.  Assembling California, Rising from the Plains, In Suspect Terrain, Crossing the Craton

Geology of Boulder County   by Ray Bridges (activist in Audubon and other groups teaching about nature) with hikes here in Boulder, Colorado

Roadside guides to Geology by state for western states 

link  for Colorado