Early in the last glacial period, about 70,000 years ago, a large eruption formed a number of liparite mountains on the edges of the caldera. Most of the highest and most beautiful rhyolite mountains in the area belong to this group, including Rauðfossafjöll, which are rhyolite deposits formed by eruptions under a glacier and are unique, both . . . get all the info at: https://www.patreon.com/RafnSig

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