From Wood and Kienle (1990): "Roundtop is an eroded and glaciated
stratovolcano, located ~13 km southwest of the village of False Pass. In the 1930's warm springs were found on its slopes. Recent field study indicates the presence of
Holocene pyroclastic flows and a group of domes south of Roundtop, as well as a thick silicic pre-Holocene flow."