solifluction lobe

...The formation of the stone pavement, which is a thin layer of structured soil and rock debris covering flat land, and the hemispherical mounds of soil called frost heaves, which are about 1m in diameter and several tens of centimeters high and covered with grass and dwarf shrubs, are the result of similar processes occurring in different areas of the earth's surface. On the slopes, the solifluction lobes, which are tongue-shaped with slight undulations several tens of centimeters high at the front of the solifluction, and stratified slope deposits, which are alternating layers of fine-grained material less than a few millimeters in size and rock fragments several centimeters in size, are distributed. In permafrost zones, landforms such as ice wedges, which are water that fills frost cracks and freezes, huge polygonal soils with several tens of meters in diameter, palsas, which are mounds of peat with a thin layer of ice and several meters in diameter to several tens of meters in height, large mounds with ice blocks inside, ice agglomerates that accumulate under the ground surface, and shallow basins (alas) and melting lakes that form when the ice melts, develop. …

*Some of the terminology that mentions "solifluction lobe" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…構造土や岩屑が薄く平たん地をおおう石畳，草や矮小灌木におおわれた径1m前後，高さ数十cmの凍結坊主とよばれる半球状の土の高まりは，地表条件の違うところに類似の作用が働いてできたものである。斜面にはソリフラクションの前面が高さ数十cmの微起伏をもって舌状にのびたソリフラクションローブsolifluction lobe，数mm以下の細粒物質と数cm大の岩片が互層をなす成層斜面堆積物が分布する。永久凍土地帯では，凍結割れ目を満たす水が凍った氷楔（ひようせつ）ice wedge，それが作る径数十mの巨大多角形土polygons，氷の薄層をもつ径数m～数十m，高さ数mの泥炭の高まりであるパルサpalsa，さらに大型で中に氷塊をもつ小丘ピンゴpingo，地表下に集積した集塊氷，それが溶けてできた浅い盆地アラスalasや融解湖などの地形が発達する。…

※「solifluction lobe」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