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New Tree-Ring Dates for Recent Eruptions of Mount St. Helens

  • David K. Yamaguchi (a1)
Abstract

Distinctive patterns of growth rings in increment cores from old-growth Douglas-fir (Pseudotsuga menziesii) stands identify A.D. 1800 as a more precise date for the eruption of tephra layer T by Mount St. Helens, Washington. Layer T was previously inferred to date to about A.D. 1802. Growth patterns also establish A.D. 1480 as the date of eruption of the earlier layer Wn, previously estimated as dating to about A.D. 1500. The timing of radial tree growth places a small limitation on the seasonal resolution of these new tree-ring dates.

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L.B. Brubaker , (1980). Spatial patterns of tree growth anomalies in the Pacific Northwest. Ecology 61 4 798807.

A.P. Durce , (1966). Tree-ring dating of recent volcanic ash and lapilli, Mount Egmont. New Zealand Journal of Botany 4 341.

W.A. Eggler , (1967). Influence of volcanic eruptions on xylem growth patterns. Ecology 48 4 644647.

M. Stuiver , (1978). Radiocarbon timescale tested against magnetic and other dating methods. Nature (London) 273 271274.

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Quaternary Research
  • ISSN: 0033-5894
  • EISSN: 1096-0287
  • URL: /core/journals/quaternary-research
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