Volcanic Ash from Mount Mazama (Crater Lake) and from Glacier Peak

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Science  12 Jun 1964:
Vol. 144, Issue 3624, pp. 1334-1336
DOI: 10.1126/science.144.3624.1334


New petrographic and chemical data indicate that the great Mount Mazama eruption at Crater Lake, Oregon, about 6600 years ago was the source of most ash which has been called "Glacier Peak" and of some ash called "Galata." Glacier Peak volcano in Washington was itself the source of an older ash deposit, perhaps very late glacial or early postglacial in age.