The volcano rises about above the surrounding terrain, the summit of the volcano is heavily hydrothermally altered and its summit crater degraded by erosion, with crags representing remnants of the old lava conduit. Several lava domes were emplaced on top of lava flows from Tunupa on its eastern flank. Pyroclastic flows are found on the northern flank. Erosion and glaciation have generated a deposit of eroded material that surrounds much of the volcano.