AVEBURY henge contains the world鈥檚 largest stone circle, but unlike its more famous neighbour Stonehenge, we know little about it. Now buried structures have been found at the monument that suggest the ancient complex began as a simple dwelling.
The monument in Wiltshire, UK, is just 30 kilometres from Stonehenge. It comprises a 332-metre-wide stone circle, containing two further stone circles and avenues of paired standing stones. The entire site is surrounded by a circular ditch and embankment. But Avebury鈥檚 origins have been uncertain, as it hasn鈥檛 been investigated to the same extent as Stonehenge.
The last major excavation took place in the 1930s, and couldn鈥檛 determine whether Avebury was constructed gradually over time, or as one large entity.
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To investigate, Mark Gillings at the University of Leicester, UK, and his colleagues used ground-penetrating radar to look for buried structures, as well as re-examining records of earlier investigations. The team focused on the southern inner stone circle, which is 100 metres wide. The radar survey found a square of standing stones buried in the middle of the circle, with sides 30 metres long. 鈥淭o find a square megalithic structure is very unusual,鈥� says team member Joshua Pollard of the University of Southampton, UK.
The square was built around another structure, which appears to be the remains of a Neolithic house, in the geometric centre of the southern inner stone circle.
This leads the team to believe that the monument started out as a house in the early Neolithic era. Flint tools at the site and the age of similar dwellings elsewhere suggest this was around 3700 BC.
Some time later, the site may have been turned into a monument with the erection of the stone square that was later enclosed by stone circles and the embankment. Pottery found in the stone holes suggests this may have happened around 3000 BC (Antiquity, ). 鈥淚t鈥檚 a monument that developed in a series of stages,鈥� says Pollard.
But why did prehistoric people go to such lengths to create a monument around what was once a modest dwelling?
The team thinks the site of the house may have taken on special value to the descendants of those who built it, who then commemorated the site with stone monuments. Think of Elvis Presley鈥檚 home, Graceland, says Pollard. 鈥淚t was once just a house, now it鈥檚 a shrine.鈥�
For now, though, this idea is unproven. 鈥淚t鈥檚 an interesting piece of work,鈥� says Timothy Darvill of Bournemouth University, UK. But without firm dates for the construction of the Avebury megaliths, 鈥渋t鈥檚 not a clincher鈥�, he says.
To address this, the team plans to carry out further investigations at Avebury. 鈥淲e hope that, in the next five to six years, we will get a better understanding of precise chronology,鈥� says Pollard. The team also wants to investigate Avebury鈥檚 northern inner stone circle to see whether that, too, might have been built on the site of an earlier house.
