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The Barrier
The Barrier is a lava dam retaining the Garibaldi Lake system in southwestern British Columbia, Canada. It is over 300 m (1,000 ft) in thickness and about 2 km (1.2 mi) wide 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 when large lava flows emanated from a vent on the west shoulder of Mount Price about 9,000 years ago called Clinker Peak. The large lava flowed towards the Cheakamus River 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「The Barrier」の詳細全文を読む
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