English Hannegan caldera Cited by user Chris Capoccia on 12 Dec 2022 Hannegan caldera is a 3.72 million year old volcanic collapse structure in the North Cascades of the U.S.
English Mount McLoughlin Cited by user Ceranthor on 29 Jan 2018 Mount McLoughlin is a steep-sided lava cone built on top of a stratovolcano, or composite volcano, in the Cascade Range of southern Oregon and within the Sky Lakes…