Global Volcanism Program | Image GVP-03233
Medicine Lake volcano is seen here looking over the summit crater from the east with Mount Shasta in the background. The barren Medicine Glass Flow on the right was erupted about 5,200 years ago. During the Holocene, obsidian flows were erupted from summit and flank vents, and voluminous basaltic lava flows originated from vents on the north and south flanks.
Photo by Dan Dzurisin, 1985 (U.S. Geological Survey).