...Terraces are also classified into erosional terraces and accumulation terraces or fill terraces, depending on the erosion and deposition that formed the terrace surface. Therefore, depending on the combination of the two, terrace surfaces are divided into three: (1) gravel-accumulation terraces (also called filltop terraces), (2) gravel-erosion terraces (fillstrath terraces), and (3) rock-erosion terraces (strath terraces). Gravel-accumulation terraces are formed by the deposition of a thick layer of gravel on a valley topography that was once carved by erosion, and serve as geological and geological evidence of riverbed changes and sea and lake level changes that caused such erosion and deposition. ... *Some of the terminology that mentions "filltop terrace" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…また段丘は,段丘面を形成した浸食・堆積作用により,浸食段丘erosional terraceと堆積段丘accumulation terrace,fill terraceに区分される。したがって,両者の組合せによって段丘面は,(1)砂礫堆積面段丘(フィルトップ段丘filltop terraceともいう),(2)砂礫浸食面段丘(フィルストラース段丘fillstrath terrace),(3)岩石浸食面段丘(ストラース段丘strath terrace)に三分される。砂礫堆積面段丘は,一度浸食によって刻みこまれた谷地形が厚い砂礫層の堆積によって形成されたもので,そのような浸食と堆積をもたらした河床変動や海面・湖面変動などの地形・地質学的証拠となる。… ※「filltop terrace」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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