Global Volcanism Program | Image GVP-06546
The East Lake obsidian flows and associated pumice deposits were erupted from fissures parallel to the inner caldera wall about 3500 years ago. The westernmost of the two rhyolitic East Lake obsidian flows is seen here. It traveled to the north towards East Lake, part of which can be seen beyond the the forested area in the center of the photo, below the eastern caldera wall. This marked the second youngest eruption of obsidian lava flows in Newberry caldera.
Photo by Lee Siebert, 1997 (Smithsonian Institution).