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(Article of periodic en Anglais - 1984)

Document title

The age of Glacier Peak tephra in west-central Montana

Authors(s) and Affiliation(s)

MEHRINGER P. J. Jr. ; SHEPPARD J. C. ; FOIT F. F. Jr. ;

Abstract

At Sheep Mountain Bog, near Missoula, Montana a late-glacial tephra, that probably fell in late summer, is preserved in lake deposits. Sediment surrunding the ash was 14C dated to about 11,200 yr B.P. Electron-microprobe analyses of the volcanic glass and horublende phenocrysts from this ash layer indicate that they are similar in major-element chemistry to those of Glacier Peak layer G previously considered to be about 12,000 yr old or older.

Source

Article of periodic

published at : Quaternary research New York

Editor :

Millesime : 1984, vol. 21, no1 [pp. 36-41]

Bibliographic references : 15 réf.

Language

Anglais

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