The southernmost of a series of obsidian lava domes and flows erupted about 2,000 years ago along a 5-km-long N-S fissure on the SE flank of South Sister, with the end of the flow visible to the left near Sparks Lake. The barren lower right skyline of South Sister is the Newberry lava flow, the largest and northernmost of the lava flows erupted along the 5-km-long chain named after Devils Hill, the forested peak to the left.

Photo by Lee Siebert, 1995 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Galleries: Stratovolcanoes

Keywords: stratovolcano | lava flow

Three Sisters