Description
Covers 1,800 sq. miles of the southern boundary of the Colorado Plateau; contains 600 volcanoes ranging in age from nearly 6 million years old to less than 1,000 years old.
Coconino County · Arizona
Covers 1,800 sq. miles of the southern boundary of the Colorado Plateau; contains 600 volcanoes ranging in age from nearly 6 million years old to less than 1,000 years old.