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Unlike the Laurentide Ice Sheet, which may have taken as many as eleven thousand years to fully melt, [3] the Cordilleran ice sheet melted very quickly, probably in four thousand years or less. [4] This rapid melting caused floods such as the overflow of Lake Missoula and shaped the topography of the fertile Inland Empire of Eastern Washington. [5]
The Cordilleran Ice Sheet has left remnants throughout the Northern Rocky Mountains, covering British Columbia and reaching into northern Washington State and Montana. The Cordilleran ice sheet has more of an Alpine style of many glaciers merged into a whole.
The Cordilleran ice sheet covered up to 1,500,000 square kilometres (580,000 sq mi) at the Last Glacial Maximum. [11] The eastern edge abutted the Laurentide ice sheet. The sheet was anchored in the Coast Mountains of British Columbia and Alberta, south into the Cascade Range of Washington. That is one and a half times the water held in the ...
A kame near Kirriemuir, Scotland A kame in Yellowstone National Park, Wyoming A kame among the glacial drift on the terminal moraine of the Okanagan Lobe of the Cordilleran Ice Sheet on the Waterville Plateau of the Columbia Plateau in Washington
In addition, the atypically linear string of glacial erratics that comprise the Foothills Erratics Train was created by the parallel, non-turbulent flowage of two very large ice masses—the Cordilleran Ice Sheet to the west, and the Laurentide Ice Sheet to the east—that occurred at the boundary between them.
The Cordilleran ice sheet formed a glacial dam across the Clark Fork valley, creating a large lake just south of modern-day Sandpoint. Repeated failures of this dam triggered jökulhlaups, a type of glacial outburst flood. [10]: 105 [11]: 1 The exact cause of these failures is disputed.
Glacial outwash sediment, Knud Rasmussen Glacier, Greenland. An outwash fan is a fan-shaped body of sediments deposited by braided streams from a melting glacier.Sediment locked within the ice of the glacier gets transported by the streams of meltwater, and deposits on the outwash plain, at the terminus of the glacier.
The Cordilleran ice sheet also blocked the Clark Fork River and created Glacial Lake Missoula, rising behind a 2,000 feet (610 m) high ice dam in flooded valleys of western Montana. Over 2000 years the ice dam periodically failed, releasing approximately 40 high-volume Missoula Floods of water down the Columbia River drainage, passing through ...