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Multiple ice flow directions during the Fraser Glaciation in the lower Skagit River drainage, northern Cascade Range, Washington

Arctic and Alpine Research

By:
https://doi.org/10.2307/1550716

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Abstract

Stratigraphic mapping and pebble-count data suggest that ice flowed in three different directions in the lower Skagit drainage of the northern Cascade Range during the Fraser Glaciation (∼ 10K to 20K BP). Glacier reconstructions suggest that till exposed at one site in the lower Skagit Valley was deposited by a Baker Valley glacier that flowed westward down the Skagit Valley during the early part of the Fraser Glaciation (Evans Creek Stade). Stratigraphic relations show that the Cordilleran Ice Sheet subsequently advanced up the Skagit Valley and into the Baker Valley during the Vashon Stade. Flow-direction indicators, as well as clast compositional variations in till and recessional deposits of Vashon age, indicate that this upvalley, eastward-advancing glacier was later overwhelmed by southeast-flowing ice of the Cordilleran Ice Sheet which entered the Baker Valley across the valley divide to the northwest.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Multiple ice flow directions during the Fraser Glaciation in the lower Skagit River drainage, northern Cascade Range, Washington
Series title:
Arctic and Alpine Research
DOI:
10.2307/1550716
Volume:
12
Issue:
3
Year Published:
1980
Language:
English
Publisher:
INSTAAR, University of Colorado
Description:
10 p.
First page:
299
Last page:
308
Country:
United States
State:
Washington
Other Geospatial:
Cascade Range, Skagit River drainage