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Archaeologists hope the find will enable them to discover how the stones were transported to Stonehenge.
Experts say they have confirmed for the first time the precise origin of some of the rocks at Stonehenge. It has long been suspected that rhyolites from the northern Preseli Hills helped build the monument.
The museum's Dr Richard Bevins said the find would help experts work out how the stones were moved to Wiltshire.
Read the whole story: Stonehenge rocks Pembrokeshire link confirmed
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