William J. Fritz

Nineteen road guides fully explore the volcanic pedigree of Yellowstone Country, with its more than ten thousand geysers, hot springs, fumaroles, and mud pots, as well as cubic mile upon cubic mile of once-incendiary rhyolite. The region also contains exquisitely preserved, fifty-million-year-old petrified trees buried in conglomerate; mountain-sized blocks of rock that slid more than fifty miles in a massive debris avalanche; the glacially carved craggy peaks and U-shaped valleys of the Beartooth Mountains and Absaroka Range; and the Grand Canyon of the Yellowstone, the excavation of which is still a mystery. This completely revised second edition reexamines the region using the latest scientific thinking and now includes full-color photos, maps, and diagrams.