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Keyhole Falls : ウィキペディア英語版 | Keyhole Falls
Keyhole Falls is the unofficial name for the largest waterfall along the Lillooet River in British Columbia, Canada. The falls are high and are a punchbowl type of waterfall. It is called Keyhole Falls because it resembles a giant old-fashioned keyhole.〔 ==Formation==
Keyhole Falls was formed when the Lillooet River was dammed with breccia from a Plinian eruption at Mount Meager about 2350 years ago. The thick breccia soon eroded from water activity, forming Keyhole Falls. There was a massive flood when the water first broke through the breccia. The flood was big enough that small house-sized blocks of breccia were carried away during the flood.〔(Catalogue of Canadian Volcanoes: Mount Meager )〕
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「Keyhole Falls」の詳細全文を読む
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