Does a Caldera Form the Islands of the Four Mountains, Alaska? Posted by agimarc on 2023-01-01 Posted in: America N, Volcanoes. Tagged: Aleutians, Andesite, Caldera, Carlisle, Cleveland, hydrothermal, ignimbrite, Islands of Four Mountains, Tana. Leave a comment Islands of the Four Mountains with volcanoes named. Image courtesy Quantum Spatial Photo, via Power, et al, Dec 2020 via Volcano Discovery Continue ReadingAdvertisement