The overall flat-topped topography of Hoodoo Mountain led Canadian volcanologist Jack Souther to refer Hoodoo Mountain as a tuya, which are flat-topped, steep-sided subglacial volcanoes formed when lava erupts through a thick glacier or ice sheet. However, Hoodoo Mountain does not fit the normal tuya model because of its complex layering of rocks, although Hoodoo's unusual structure obviously results from frequent interactions between volcanic activity and Pleistocene ice sheets over the past 100,000 years.