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 Geology of the Lassen volcanic area Cited by user DOI bot on 03 May 2008 The geology of the Lassen volcanic area presents a record of sedimentation and volcanic activity in the area in and around Lassen Volcanic National Park in Northern…