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Science 12 March 1965:
Vol. 147. no. 3663, pp. 1288 - 1290
DOI: 10.1126/science.147.3663.1288
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Articles

Mazama and Glacier Peak Volcanic Ash Layers: Relative Ages

Roald Fryxell 1

1 Laboratory of Anthropology, Washington State University, Pullman

Physiographic and stratigraphic evidence supports the regional correlation of two volcanic ash layers with extinct Mount Mazama at Crater Lake, Oregon, and Glacier Peak in the northern Cascade Range of Washington. A radiocarbon age of 12,000 ± 310 years confirms geological evidence that ash derived from the Glacier Peak eruption is substantially older than ash from the Mazama eruption of 6600 years ago.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Recent Volcanic Activity at Glacier Peak.
J. E. Beget and J. E. BEGET (1982)
Science 215, 1389-1390
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Neutron Activation for Distinguishing Cascade Range Pyroclastics.
A. A. Theisen, A. A. Theisen, G. A. Borchardt, M. E. Harward, and R. A. Schmitt (1968)
Science 161, 1009-1011
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Mazama Ash in the Northeastern Pacific.
C. H. Nelson, C. H. Nelson, L. D. Kulm, P. R. Carlson, and J. R. Duncan (1968)
Science 161, 47-49
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Titanium Dioxide in Pyroclastic Layers from Volcanoes in the Cascad Range.
G. K. Czamanske, G. K. Czamanske, and S. C. Porter (1965)
Science 150, 1022-1025
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Mazama and Glacier Peak Pumice Glass: Uniformity of Refractive Index after Weathering.
V. C. Steen, V. C. Steen, and R. Fryxell (1965)
Science 150, 878-880
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