Lassen Peak rises in the background behind the Chaos Crags, a group of dacitic lava domes on Lassen's north flank. The Chaos Crags were formed during a series of eruptions about 1100 to 1000 years ago in which early explosive eruptions and pyroclastic flows were followed by growth of a complex of five lava domes. The area of light-colored talus on the right side is the source of a large debris avalanche from Chaos Crags about 1650 CE.

Photo by Dan Dzurisin, 1982 (U.S. Geological Survey).

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Lassen Volcanic Center