While waiting for a storm to skirt our camp the geology faculty presented some important concepts on the geology of this region. Some of the topics covered included: margin features of the Colorado Plateau (it behaves as a single block despite tectonism on all sides), timing and tectonics of Colorado Plateau uplift determined by thermochronometry (using apatite crystals), early- to mid- Tertiary unroofing, tertiary rim gravels (old river system that had eroded part of the plateau), the Mogollon Rim, and erosion of the Grand Canyon in the last 5 Ma.

Storm clouds Talk under rock