Nature
Following the May 1915 Lassen Peak eruptions, B.F. Loomis and other local residents discovered several massive hot rocks resting in the valley miles from the volcano. This hot rock is a piece of dacite lava that filled Lassen Peak’s crater. On May 14, 1915, lava began welling up and plugged the volcano’s crater. Pent-up gases within the volcano blasted and shattered the lava cap on May 19. Careening down the mountainside, hot lava rocks touched off a snow avalanche. The avalanche carried this 300-ton rock five miles from Lassen Peak to this location, where it settled, sizzled, and cooled.
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