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Plinian eruption of Mt. St. Helens on May 18, 1980 (USGS Photograph taken on May 18, 1980, by Donald A. Swanson) Pumice deposit on Santorini, Greece, from the large Plinian "Minoan" eruption on Santorini in 1613 BC, showing the holes in the pumice where remants of an olive tree could be found and recovered by Tom in 2003. This material allowed the most recent and most precise dating of this eruption to date.