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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.
I believe this to be highly unlikely. Most people believe the stones were transported by human power alone. There have been several routes proposed, but the most popular belief is that they were taken along the coast of Wales by sea and then overland to Stonehenge. Several attempts have been made to re-enact the moving of the Bluestones.