The best-known effect of glaciation is the U-shaped valley. Great Langdale in the Lake District is one such example, but the scene we see today is a combination of features formed during and since the ice age.
Very little solid rock can be seen in the photograph, but it does outcrop at about the 450 m contour (see the key sketch to the photograph in Figure 1). The lower parts of the U are covered by falls of broken rock which have built up great slopes on both sides.
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