...Given the same amount of precipitation in a drainage basin, glacial erosion is stronger than fluvial erosion, so glacial valleys are carved into deep, wide, U-shaped valleys. After the glacier disappears, the rounded rock surface of the roche moutonné, which resembles a sheep's back or a flock, is exposed at the bottom of the glacial valley. In the shield lands of Fennoscandia and Laurentia, which were covered by ice sheets during the Pleistocene glacial period, low-relief surfaces of the bedrock polished under the ice sheets, that is, glacial peneplains, are widespread. *Some of the terminology explanations that mention "roche moutonné" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…流域の降水量が同じとした場合は,氷食は河食に比べて強く働くので,氷食谷は深く幅広くU字形にうがたれる。氷河が消失した後の氷食谷底には,円磨された岩面が羊の背とも群れともみえる羊群岩roche moutonnéが露出する。洪積世氷期に氷床に覆われていたフェノスカンジアおよびローレンシアの楯状地では,氷床下で研磨された基盤岩の小起伏面すなわち氷食準平原が広がる。… ※「roche moutonné」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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