…The alternation of hard sandstone layers and soft shale layers according to the fold structure controls the distribution of rocks, and then as a result of the uplift of the entire region and the accompanying erosion, the rock layers that are more resistant to erosion become mountain ridges and the rock layers that are less resistant become valleys, and ultimately the topography is governed by the pattern of the fold structure. This type of topography, in which the fold structure appears as an erosion topography, is called Appalachian relief (topography). In general, it is safe to say that the geological structure came first and the topography came more recently. … *Some of the terminology that refers to "Appalachian relief" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…褶曲構造に従った硬い砂岩層や軟らかいケツ岩層の互層の状態が岩石の分布を支配し,次いで地域全体の隆起とそれに伴う削剝の結果,浸食に対する抵抗性の大きい岩層が山稜となり,抵抗性の小さい岩層が谷となるため,結局は褶曲構造の模様に支配された地形が現出している。このように褶曲構造が浸食地形として現れたこの種の地形をアパラチア(式)地形Appalachian relief(topography)と呼んでいる。 一般に地質構造が先にあって地形はそれより新しく生じたものといって差支えない。… ※「Appalachian relief」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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