Loading ...interesting volcano-related geomorphic feature, known locally as ‘the Barrier’. There are some images of the barrier in the link below. When the Cheakamus valley was filled with an ice sheet a lava flow from the Garibaldi volcanic belt was interrupted in its downward movement when it came up against the ice-filled valley. The result was the vertical andesitic wall that you see in some of these images. Instead of exiting down into Cheakamus valley, the lava flow instead created a dam that resulted in a water-filled basin now known as Garibaldi Lake, which can be seen just up-slope from ‘the Barrier. In 1947, Bill Mathews, the geologist who was my geomorphology prof in 1959, was the first to use the term ‘tuya’ to describe flat-topped volcanic outlets that have erupted under an ice sheet. There are tuyas nearby the area of today’s ‘Barrier’. A more recently described tuya in the Stikine area of British Columbia is now named the ‘Mathews Tuya’
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