...they are generally filled with thick deposits such as glacial deposits, glacial flow deposits, and alluvial and marine deposits, but sometimes with lava or pyroclastic flows from volcanic activity or with debris from rapid soil erosion. It is necessary to distinguish between buried valleys and fossil valleys, which are former valleys that are covered by sedimentary layers and are buried underground. The process of covering the valley floor and walls, which were once the surface, with sediments and creating a wide depositional surface on top of them is called silting. *Some of the terminology explanations that mention "buried valley" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…一般に氷河堆積物,融氷河流堆積物,河成・海成の沖積層などの厚い堆積物で埋め立てられていることが多いが,ときには火山活動による溶岩や火砕流または急激な土壌浸食によって生じた岩屑などで充てんされている。堆積層に覆われて地下に埋没しているかつての谷地形は埋没谷buried valleyあるいは化石谷と呼んでいるので区別する必要がある。かつて地表であった谷底や谷壁を,堆積物によって覆い隠し,その上に広い堆積面をつくる作用を埋積作用と呼ぶ。… ※「buried valley」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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