Geology of Flagstaff and Geologic History of Rio de Flag, Northern Arizona with Trail Guides to Geology along Rio de Flag

This geology and trail guide is for anyone who likes to walk, be outdoors, and is interested in the geology in and around Flagstaff. The geologic story is focused on Rio de Flag because it flows through Flagstaff, touches or passes by all of the geologic elements in the city, and is accessed easily.