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Global Volcanism Program | Image GVP-03147

The Central Pumice Cone at the right was formed during a major rhyolitic eruption about 6400 years ago.  Many other vents on the north and south caldera walls and the caldera floor were also active at this time, producing pumice rings and obsidian flows.  Paulina Peak forms the high point on the south caldera rim at the left. Photo by Lee Siebert, 1984 (Smithsonian Institution).

The Central Pumice Cone at the right was formed during a major rhyolitic eruption about 6400 years ago. Many other vents on the north and south caldera walls and the caldera floor were also active at this time, producing pumice rings and obsidian flows. Paulina Peak forms the high point on the south caldera rim at the left.

Photo by Lee Siebert, 1984 (Smithsonian Institution).


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