Desert Heat-Volcanic Fire: The Geologic History of the Tucson Mountains and Southern Arizona

The Arizona-Sonora Desert Museum perches on the edge of a volcano that was once 25 kilometers long. Okay: that was 70 million years ago...but we're talking drama, people: large scale geological drama! Read more about the hot and spicy geologic history of the Tucson Mountains and Southern Arizona in this book published by the Arizona Geological Society. (DH)