Roche Moutonnée

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roche moutonnée

[′rōch ¦müt·ən¦ā]
(geology)
A small, elongate hillock of bedrock sculptured by a large glacier so that its long axis is oriented in the direction of ice movement; the upstream side is gently inclined, smoothly rounded, but striated, and the downstream side is steep, rough, and hackly.

Roche Moutonnée

 

a bedrock boss which has been smoothed and polished by the action of a moving glacier. Usually the slope facing the glacier is gentle and polished smooth, with a characteristic rounded profile. The opposite slope is steeper and more uneven. The length of a roche moutonnée can be hundreds of meters, and the height 50 m. Groups of small, closely placed roches moutonnées are sometimes called ice-sculptured rocks. Roches moutonnees are found in both continental and mountain regions of recent and ancient glaciation. In the USSR roches moutonnees are particularly common on the Kola Peninsula and in Kareliia.