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   » » Wiki: The Barrier
Tag Wiki 'The Barrier'.
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The Barrier is a retaining the system in southwestern , . It is over thick and about long where it impounds the lake. BCGNIS Geographical Name Details

The area below and adjacent to The Barrier is considered hazardous due to the unstable lava formation.


Formation
The Barrier was formed about 15,000–12,000 years ago when large lava flows emanated from on the west shoulder of Mount Price. The large lava flowed towards the valley. At the time of eruption, the valley was filled by glacial ice. The lava flow was stopped by the ice and ponded, eventually cooling to form an ice-marginal lava flow. When the ice melted away, the ice-cooled lava-flow front formed a precipitous cliff; water ponded behind the lava dam, forming Garibaldi Lake.


Rubble Creek boulder field
The unstable lava formation of The Barrier has in the past unleashed several in the area below Garibaldi Lake. The most recent major landslide in 1855-1856 formed a large boulder field which gives its name. Catalogue of Canadian volcanoes - Garibaldi volcanic belt Retrieved on 2007-09-07 At least of rock was removed from The Barrier during the 1855-1856 event.


Hazards
Concerns about The Barrier's instability due to volcanic, tectonic, or heavy rainfall activity prompted the provincial to declare the area immediately below it unsafe for human habitation in 1981. This led to the evacuation of the small resort village of Garibaldi nearby, and the relocation of residents to new recreational subdivisions away from the hazard zone. Should The Barrier completely collapse, would be entirely released and downstream damage in the and would be considerable, including major damage to the town of Squamish and possibly an impact-wave on the waters of that would reach .


See also
  • Garibaldi Lake volcanic field
  • Garibaldi Volcanic Belt
  • Cascade Volcanoes
  • Volcanism in Canada
  • Garibaldi Provincial Park

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