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They also claimed that small pieces of debris found near Stonehenge, which were traced back to the dig site in Wales, were actually transported by the movement of glaciers over half a million years ago, and not brought by ancient masons along with the bluestones.
Description. The cliffs around Old Harry Rocks are made of chalk. Wave refraction causes erosion of the headland and deposition in the bays either side. The cliffs are eroded when waves undercut the land causing the rock above to collapse. Caves are formed where cracks in the chalk are expanded due to hydraulic action.Caves can open up through the cliff to form arches, and the collapse of arches results in stacks such as Old Harry Rocks.he cliffs are eroded when waves undercut the land causing the rock above to collapse. Caves are formed where cracks in the chalk are expanded due to hydraulic action. Caves can open up through the cliff to form arches, and the collapse of arches results in stacks such as Old Harry Rocks.