The Age of Glacier Peak Tephra in West-Central Montana
Authors:
- Peter J. MehringerPMPeter J. Mehringer
- John C. SheppardJSJohn C. Sheppard
- Franklin F. FoitFFFranklin F. Foit
- 20 January 1984
- journal article
- Published by Cambridge University Press (CUP) in Quaternary Research
- Vol. 21 (1) , 36-41
Abstract
At Sheep Mountain Bog, near Missoula, Montana, a late-glacial tephra, that probably fell in late summer, is preserved as an 8-mm-thick graded bed overlain by another 8 mm of redeposited ash mixed with lake deposits. Sediment surrounding the ash was 14C dated to about 11,200 yr B.P. Electron-microprobe analyses of the volcanic glass and hornblende 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.Keywords
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