Alaska Volcano Observatory

Oblique aerial view of the Lost Jim cone – the source vent for the Lost Jim lava flow. The vent was a perched lava lake that fed lava into a lava tube system which exits the lake at upper left. The cinder cone is the last gasp of the eruption, producing no lava flows, and erupted after the lava lake had at least partly cooled and subsided. The Lost Jim lava flow, the youngest lava flow in the Imuruk Lake Lava Field, is thought to have erupted roughly 1,000–2,000 years ago.