Stratigraphy, structure, and economic geology of an area at the west edge of the Colorado Plateau.

At the same time the Blue Ridge and the Bull Run Mountain shielded most of the Confederates." "Longstreet and Lee had to move through Thoroughfare Gap to join Jackson and attack Pope. That gap, carved through the resistant quartzite of Bull Run Mountain by Broad Run's waters, is a focal point of this account."--BOOK JACKET.