DESCRIPTIVE GEOLOGY
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movement is called the stoss side, because it receives the brunt of the pressure, and is consequently deeply
Fig. 6. — Roche Moutonnée, showing the ice, carrying ground moraine, pressing against a bar of hard rocks and polishing and rounding it on the stoss side
scored by the boulders held in the ice; the lee side, facing downstream, is unscratched, because the ice bends over it and does not touch it. These rounded
Fig. 7. — Roches Moutonnées, showing the surfaces rounded and polished on the side the ice sheet moved from (stoss side), and rough and irregular on the lee side.
hummocks are called roches moutonnées, because the stoss side is covered with smooth ridges separated by deeply scored hollows, and these together give the ap-
