Blake Alsup, New York Daily News, February 27, 2019
Researchers have known that the monument, which was built around 5,000 years ago, came from Preseli Hills in west Wales, but have now identified two quarries where “bluestones” were excavated around 3000 B.C.
The team discovered tools and evidence of quarrying techniques at the Carn Goedog and Craig Rhos-y-fellin quarries, including several wedge-shaped tools that are believed to have been used for opening up the joints between naturally formed pillars so that they could be removed.
This evidence proves that the stones were moved by humans approximately 143 miles to the Stonehenge location.
“It finally puts to rest long-standing arguments over whether the bluestones were moved by human agency or by glacial action,” University of Southampton Archeology Professor Joshua Pollard told CNN.
The discovery also disproves the theory proposed by geologist H.H. Thomas in 1923 that Stonehenge bluestones were taken from other quarry location in south Wales.