The Cordilleran Ice Sheet in Washington, Idaho, and Montana
Waitt RB and Thorson RM. 1983. The Cordilleran Ice Sheet in Washington, Idaho, and Montana. Pages 53-70. In Porter SC. Late-Quaternary Environments. London. Late-Quaternary Environments of the United States Vol. I: The Late Pleistocene
During the Fraser (Late Wisconsin) Glaciation, the Cordilleran ice sheet advanced southward from source areas in British Columbia and terminated in the United States between the Pacific Ocean and the Continental Divide. The ice sheet extended farthest along major south-trending valleys and lowlands that traverse the international boundary; it formed several composite lobes segregated by highlands and mountain ranges. Each lobe dammed sizable lakes that drained gernally southward or westward along ice margins and across divides. In 1965 the entire Pleistocene stratigraphy of the Cordilleran ice sheet in and west of the Cascade Range was summarized by Crandell (1965) and that east of the Cascade Range by Richmond and others (1965). Our subject is a more detailed summary of the Fraser Glaciation, and this chapter focuses on concepts developed since 1965.
- Type
- Book Chapter
- Authors
- Waitt, Richard; Thorson, Robert
- Units
- OLYM
- Keywords
- Geology, Glaciation, Glaciers, Pleistocene