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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]
After the Cordilleran Ice Sheet retreated from higher elevations less than 15,000 years ago, andesite eruptions of the third eruptive phase occurred from a satellite vent at Price Bay. [3] [5] [16] These eruptions resulted in the creation of a small lava dome or scoria cone on Mount Price's northern flank with an elevation of 1,788 metres ...
The Cordilleran ice sheet dammed up Glacial Lake Missoula at the Purcell Trench Lobe. [10] A series of floods occurring over the period of 18,000 to 13,000 years ago swept over the landscape when the ice dam broke. The eroded channels also show an anastomosing, or braided, appearance.
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]
Lake Peace was a post ice-age glacial lake in what is now the Peace River basin in northeastern British Columbia and northwestern Alberta.. It formed approximately 14,000 BCE, [1] [2] after the Last Glacial Maximum, as the Laurentide Ice Sheet and Cordilleran Ice Sheet began to melt and retreat, and may have played an important role as an easily navigatable section of an inland human migration ...
Like Mount Cayley, it predates the appearance of the Cordilleran Ice Sheet. Other volcanoes in the central segment, such as Slag Hill, Ember Ridge, Cauldron Dome, Pali Dome and Ring Mountain, were formed when lava came into contact with the Cordilleran Ice Sheet. They are similar in structure to tuyas, displaying oversteepened ice-contact ...
The overlying ice sheet sagged as the volcanic pile and enclosing meltwater cavity grew larger, resulting in the formation of a meltwater lake inside a depression on the surface of the ice sheet. This meltwater lake was churned by phreatic explosions and probably reached a length of more than 4 kilometres (2.5 miles).
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 ...