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Hamilton ravine system : ウィキペディア英語版 | Hamilton ravine system
The Hamilton ravine system is one of the most distinctive features of the geography of Hamilton, Ontario, Canada. It is a network of deep ravines that form a large urban forest that runs throughout much of the city. For the most part designated as parkland, the ravines are somewhat undeveloped. ==Origin== Hamilton is known for having the Niagara Escarpment run through the entire city. This was formed after the end of the last Ice Age some 12,000 years ago. After glaciers carved the area of which the Great Lakes are now situated.〔(【引用サイトリンク】title=The Natural History of the Niagara Escarpment )〕 Many of the streams located on the top of the escarpment that would drain into the higher elevated lakes would eventually form most of Hamilton's waterfalls and cascades after the lake levels receded. Eventually these streams would erode the soft sand like soils in the lower section of Hamilton area and form many of their ravines today
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「Hamilton ravine system」の詳細全文を読む
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