Mt. St. Helens/Pumice-Plain

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Pyroclastic flows covered the land north of the volcano with pumice many feet deep. During summer 1980, helicopters landed crews on this sterile, desolate terrain, which came to be called the Pumice Plain (photo by C. Crisafulli).

Pyroclastic flow zone during the first summer after the May 18, 1980 eruption (photo by C. Crisafulli).