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It has been formed by rainwash from a hill of chalk, which must once have existed to the south.

Often much of the face of the cliff is covered with slip or rainwash, and overgrown with vegetation.

In winter the clays become semi-liquid, in summer the surface may be largely slip and rainwash, baked hard by the sun.

After a time the great boulders fall off and the underlying clay becomes worn by the rainwash to fantastic spikes and ridges.