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Tindfjallajokull
"Tindfjallajökull is one of the oldest late-Quaternary volcanoes of the eastern volcanic zone of Iceland and has produced rocks of basaltic-to-rhyolitic composition. Eruption of the rhyolitic and trachyandesitic Thórsmörk Ignimbrite accompanied formation of a 5-km-wide caldera about 54,500 years ago. The NW rim of the caldera is topped by the Tindfjallajökull icecap. About a dozen small eruptions took place during the late Pleistocene or early Holocene, mostly from vents north and west of the caldera."  -Smithsonian Volcano Archive
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