The Cordilleran Ice Sheet covered most of north-west North America for much of the last 2.6 million years. At the Last Glacial Maximum during the Last Glacial Period(26,500 years ago), the Cordilleran Ice Sheet likely covered as much as 2.5 million square kilometres. Stretching from Alaska to Oregon, British Columbia was entirely covered in ice that in many places over two kilometres thick. At the Continental Divide of North America the Cordilleran Ice Sheet merged with the Laurentide Ice Sheet.
The Cordilleran and Laurentide ice sheets combined covered most of North America and held one and a half times more water than the Antarctic Ice Sheet does today. Interestingly, the Cordilleran Ice Sheet did not cover most of Alaska(north of the Alaska Ridge) due to the climate being too dry to produce lasting glaciers. Another remarkable feature of the Cordilleran Ice Sheet is how quickly it disappeared relative to the Laurentide Ice Sheet. It is thought, and it really only is a thought, that the Laurentide took eleven thousand years to disappear, whereas the Cordilleran only about four thousand years. Ice ages are bewilderingly complex and it is hard to get a grasp on how so many barely understood variables combine to move us into and out of ice ages. The best we can do is hone in on more graspable aspects of glaciation and try to piece together an enormous puzzle. Approximately 9000 years ago the Cordilleran Ice Sheet was in rapid retreat and Mount Price was an active volcano. Lava flowing from Mount Price met the ice wall that filled Cheakamus Valley and formed The Barrier. The Barrier allowed Garibaldi Lake to form, where previously it was a valley extending into Cheakamus Valley. The Barrier is just one of many striking geologically formed features of Garibaldi Park close to Whistler. The Table and Black Tusk are two other bizarre and beautiful mountains produced through volcanoes pushing through the enormous Cordilleran Ice Sheet.
The Table is thought to have formed just a few thousand years ago when the Cordilleran Ice Sheet covered much of northwest North America. In 1951 Canadian Geologist Bill Mathews pieced together how this interesting mountain formed. He theorized that magma must have melted a vertical tube through to the surface of the Cordilleran Ice Sheet. The pooling lava cooled and hardened into a flat topped mountain. The lack of glacier erosion around The Table indicates that it formed at the end of the last ice age when the Cordilleran Ice Sheet was in quick retreat. So, looking across from Black Tusk to The Table you can try to visualize the land all around buried in an ice sheet about level with where you are standing. About 12000 years ago, there was a pure white sea of ice all around, and an unseen column of lava melting to the surface like a molten rock lake. What a sight it must have been with a cauldron of lava in the midst of a glacier hundreds of metres thick. While studying The Table as well as others in norther British Columbia, Bill Mathews referred to these flat topped mountains as tuyas. He called them tuyas after the Tuya River and Tuya Range in northern British Columbia.
More Whistler & Garibaldi Park Hiking A to Z!
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The Cordilleran Ice Sheet covered most of north-west North America for much of the last 2.6 million years. At the Last Glacial Maximum during the Last Glacial Period(26,500 years ago), the Cordilleran Ice Sheet likely covered as much as 2.5 million square kilometres. Stretching from Alaska to Oregon, British Columbia was entirely covered in ice that in many places over two kilometres thick. At the Continental Divide of North America the Cordilleran Ice Sheet merged with the Laurentide Ice Sheet.
Alexander Falls 
Ancient Cedars 
Black Tusk 
Blackcomb Mountain 
Cheakamus River 
Cirque Lake 
Sproatt East 
Wedgemount Lake 
January 
March 
June 
September 
