Cinder Cone on the north shore of Garibaldi Lake is a cinder cone partly engulfed by the Helmet Glacier. It consists of volcanic ash, lapilli and dispersed ropy and lava bomb segments that bring the cone's prominence to . Its minimal degree of erosion indicates that it might have erupted in the past 1,000 years. A series of basaltic andesite flows were erupted from Cinder Cone about 11,000 years ago that traveled into a deep north trending U-shaped valley on the eastern flank of The Black Tusk. Subsequent volcanism produced another sequence of basaltic lava flows 4,000 years ago that flowed in the same glacial valley.