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They say "it is unlikely that they would have transported the Pont Saeson stones up slope and over Mynydd Preseli to Milford Haven. If humans were responsible then an alternative route might need to be considered." So by sea but a different route to the sea. They then add:
"However, some believe that the stones were transported by the actions of glacier sheets during the last glaciation and so the Pont Season discovery will need appraising in the context of this hypothesis."
Something is not right. This message is just to keep things from messing up down the road