Lassen Volcanic: The Story Behind the Scenery

Lassen Volcanic: The Story Behind the Scenery by Ellis Richard. paperback edition. ISBN: 9780887140204.

Approximately 329 years ago, one of the volcanic dacite domes of the Chaos Crags collapsed. The resulting massive rockfall avalance created the Chaos Jumbles which today is still in early stages of recovery. Lassen Volcanic National Park, located in northeastern California, was established in 1916 to protect active volcanism including hot springs, steaming fumaroles, mud pots, and sulfurous vents.