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Archaeologists have discovered Stonehenge's birthdate, solving one of the historic site's longstanding mysteries.
By Jon SwaineThe monument's original stones were erected in about 2300 BC, it has been discovered - 300 years later than had previously been thought.
Analysis has indicated that the original circle of bluestones was transported to the site from the Preseli hills, 150 miles away in South Wales - an extraordinary feat.
The finding came in an ambitious project, involving the first dig inside the historic stone circle for 44 years.
Professors Timothy Darvill and Geoffrey Wainwright, the project leaders, are set to disclose other early findings.
The pair have found evidence suggesting Stonehenge was a centre of healing. They have compared the monument to a "Neolithic Lourdes", to which sick people travelled from far away, hoping to be healed by the stones' powers.
An "abnormal number" of remains found in tombs nearby display signs of serious disease, they say, while teeth found in graves prove that about half the bodies there were "not native" to the local area.
Prof Darvill said: "Stonehenge would attract not only people who were unwell, but people who were capable of healing them. Therefore, in a sense, Stonehenge becomes 'the A & E' of southern England."
Discovering the site's birthdate - which was done by sending 14 samples for carbon dating at Oxford University - was described as a "dream come true" by Prof Wainwright. "It's an incredible feeling," he added.
Before the project it was believed the first stone circle dated from between 2600 BC and 2400 BC. The new testing has rounded this down to between 2400BC and 2200 BC - and a more precise date is expected by the end of the project.
"We told the world we were going to date Stonehenge. That was a risk, but I was always confident," said Prof Darvill.
Experts said the new discovery was a major milestone in the history of Britain's most famous monument.
Dr Simon Thurley, the chief executive of English Heritage - which maintains Stonehenge - described the dig as "tremendously exciting".
He said: "The bluestones hold the key to understanding the purpose and meaning of Stonehenge.
"Their arrival marked a turning point in the history of Stonehenge, changing the site from being a fairly standard formative henge with timber structures and occasional use for burial, to the complex stone structure whose remains dominate the site today."
Dr Andrew Fitzpatrick, of Wessex Archaeology, said: "This is a great result - a very important one.
"The date of Stonehenge had been blowing in the wind. But this anchors it. It helps us to be secure about the chronology of events."
The last time an excavation was allowed inside the sarsen stone pillars was in 1964.
A documentary on the dig has been recorded by BBC Timewatch and will be broadcast on Saturday.
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