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Deglaciation of the mountainous region of northwestern Montana, U.S.A., as indicated by late Pleistocene ashes.

Arctic & Alpine Research

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Abstract

The presence of the Glacier Peak G ash and the underlying St. Helens Jy ash in laminated lake sediments near Marias Pass indicates that in this region the Continental Divide was ice free before about 11 400 BP. Macrofossils, pollen, and spores in these same sediments indicate establishment of shrubs, herbs, and scattered conifers by that time. At Sun River Canyon, about 90 km south of Marias Pass, presence of the Glacier Peak G ash in a postglacial alluvial fan indicates that glacial ice had receded upvalley from the canyon mouth and that the Sun River Glacier no longer existed by 11 200 BP. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deglaciation of the mountainous region of northwestern Montana, U.S.A., as indicated by late Pleistocene ashes.
Series title:
Arctic & Alpine Research
Volume
18
Issue:
3
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
317
Last page:
325
Number of Pages:
9