Hoodoo Mountain
During the second eruptive phase 80,000 years ago, eruptions were no longer subglacial, but the volcano was surrounded by ice at least thick. Lava flows during this eruptive phase melted some of the thick glacial ice and ponded around the perimeters of Hoodoo Mountain, which quickly solidified to form a barrier behind which more lava piled up. Such ice-marginal lava flows are anomalously thick and are normally bounded by steep cliffs with fine-scale cooling joints and much volcanic glass. These ice-marginal lava flows form the massive lava cliffs near the base of Hoodoo Mountain and are among Hoodoo's most prominent features.