CHIRICAHUA NATIONAL MONUMENT

wilderness of unusual volcanic-rock formations-tall and slender pinnacles crowded into 19 square miles (48.5 square km) of ridge and canyon on the west flank of the Chiricahua Mountains-in southeastern Arizona, U.S., 40 miles (64 km) northeast of Douglas. Established in 1924, it unfolds a geologic story nearly 1 billion years long of the Earth's eruptive and erosional forces. The region was once a stronghold of Apache Indian tribes under the chiefs Cochise and Geronimo.