Only twelve outcrops, with a total area of less than , emerge from the ice that covers Mount Takahe. The interior structure of the volcano is unknown. Based on these outcrops, lava flows with a thickness of appear to be widespread on Mount Takahe, while pyroclastic rocks such as deposits of Strombolian eruptions, lapilli tuffs and lahar deposits are less common. Occurrences of pyroclastic rocks at the summit have been correlated with tephra deposits elsewhere in Antarctica. Additional, obsidian-bearing and recently erupted lava bomb-and-block units crop out in the caldera rim, at Bucher Rim.