40x40 cm measured-area of bulk 2 cm zone of curd-like gray ashfall under 20-25 cm fresh snow, particles concentrated at the top of the 2 cm layer. Collected on 2-19-2017 from northwest side of Unalaska Island (Event 29 deposited on 1-31-2017)
Petrology of the 2016-2017 eruption of Bogoslof Island, Alaska
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