"Buried cascade ashes between peat layers as they appeared in 1975 were a silent testimony of previous volcanism in the Cascades before the 1980 eruption of Mount Saint Helens. Volcanic activity at the Mount Saint Helens site began during the last major glaciation of the Ice Age. There have been nine periods of eruptive activity, the most recent of which ended in 1857. Two geologic reports in the decade of the 1970's identified Mount Saint Helens as the most likely volcano to reawaken in the conterminous United States." (U.S. Dept. Of Commerce, 1980, p. 3)

Image of buried cascade ashes between peat layers as they appeared in 1975.
Buried Cascade ashes between peat layers
Photo: Courtesy of NGDC/NOAA.

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