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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]
Tuya Butte was the first tuya analyzed in the geological literature, [1] and its name has since become standard worldwide among volcanologists in referring to and writing about tuyas. The Tuya Mountains Provincial Park was recently established to protect this unusual landscape, which lies north of Tuya Lake and south of the Jennings River near ...
The first volcano-ice interaction is displayed as tuyas, including Tuya Butte, on the Tanzilla Plateau in the Northern Interior of British Columbia. [18] This sub-section of the Stikine Plateau consists of large flatlands with hills of low relief, and might have been one of the areas of ice accumulation for the Cordilleran Ice Sheet. [18]
After reaching its maximum extent the Cheekye Glacier and Cordilleran Ice Sheet were covered with volcanic ash and fragmental debris from Garibaldi. This period of growth began with the eruption of the Atwell Peak plug dome about 13,000 years ago from a ridge surrounded by the ice sheet. As the plug dome grew, massive sheets of broken lava ...
The northern half of the range was largely rolled over by the Flathead Lobe, which was much like a huge moving ice sheet. This led to the shorter, more rounded features of the northern half of the range. [3] The Pleistocene was a time of dramatic and quick sculpting in the Mission Mountains. And though that epoch has ended, the erosion ...
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 ...
[1] [2] Much of the current topography was formed through the erosion of the depression by the Cordilleran Ice Sheet during the Vashon Glaciation , which lasted from about 19,000 – 16,000 BP . The retreat of the ice sheet revealed a scarred landscape that filled in with sea water once it had retreated beyond what is now the Strait of Juan de ...
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