The exact location of the source of the Stonehenge bluestones is one of the stone circle's oldest mysteries
Professor Tim Darvill and the team from Bournemouth University carried out an excavation at the Carn Menyn Enclosure in the Preseli Hills of Pembrokeshire in April 2005
Professor Darvill and his colleague Geoff Wainwright believe they found the remains of a stone enclosure during their fieldwork
Professor Darvill said Carn Menyn was the main source of the bluestones used in the central circles at Stonehenge
The stones were moved over 240 miles from Pembrokeshire to Wiltshire
Blocks of stone may have been wrenched from the ground or the crags in ancient times
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