Global Volcanism Program | Image GVP-07034
Newberry caldera is one of the largest volcanoes in the conterminous United States, covering an area of about 1600 sq km. Two lakes, Paulina Lake (top) and East Lake (bottom) partially fill the 6 x 8 km wide caldera, which formed following the eruption of major ash flows during the Pleistocene. Subsequent eruptions have taken place from vents within the caldera, near its rim, and from fissure vents on its flanks. The light-colored lobate lava flow south (left) of Paulina Lake is one of several obsidian flows erupted during the Holocene.
Photo by Lee Siebert, 1998 (Smithsonian Institution).