Mystery solved: Scientists trace source of Stonehenge boulders

Study solves mystery origin of Stonehenge's iconic boulders
Stonehenge in the Wiltshire landscape. Credit: Andre Pattenden (English Heritage)

Stonehenge, a Neolithic wonder in southern England, has vexed historians and archaeologists for centuries with its many mysteries: How was it built? What purpose did it serve? Where did its towering sandstone boulders come from?

That last question may finally have an answer after a study published Wednesday found that most of the giant stones—known as sarsens—seem to share a common origin 25 kilometers (16 miles) away in West Woods, an area that teemed with prehistoric activity.

The finding boosts the theory that the megaliths were brought to Stonehenge about the same time: around 2,500 BCE, the monument's second phase of construction, which in turn could be a sign its builders were from a highly organized society.

It also contradicts a previous suggestion that one large sarsen, the Heel Stone, came from the immediate vicinity of the site and was erected before the others.

The new paper appeared in the journal Science Advances.

Lead author David Nash, a professor of physical geography at the University of Brighton, told AFP he and his team had to devise a novel technique to analyze the sarsens, that stand up to nine meters tall (30 feet) and weigh as much as 30 metric tons.

They first used portable x-rays to analyze the chemical composition of the rocks, which are 99 percent silica but contain traces of several other elements.

Tracing the stones of stonehenge
Graphic on a new study that aims to track the origins of some of the largest stones at Britain's ancient Stonehenge monument.

"That showed us that most of the stones have a common chemistry, which led us to identify that we're looking for one main source here," said Nash.

Next, they examined two core samples from one of the stones that were obtained during restoration work in 1958 but which then went missing until resurfacing in 2018 and 2019, respectively.

They performed a more sophisticated analysis on these samples using a mass spectrometry device, which detects a bigger range of elements at a higher precision.

The resulting signature was then compared to 20 possible source sites for these sedimentary rocks, with West Woods, Wiltshire found to be the closest match.

Only the 17th century English natural philosopher John Aubrey had previously postulated a link between "Overton Wood," probably a former name for West Woods, and Stonehenge.

Study solves mystery origin of Stonehenge's iconic boulders
Jake Ciborowski (University of Brighton) analysing the sarsen core extracted from Stone 58 at Stonehenge using a portable x-ray fluorescence spectrometer. Credit: Sam Frost (English Heritage)

'Enormous endeavor'

Previous work has found that Stonehenge's smaller "bluestones" came from Wales, about 200 kilometers (160 miles) to the west, and the new study says that they and the sarsens were placed at the same time.

"So it must have been an enormous endeavor going on at that time," said Nash. "Stonehenge is like a convergence of materials being brought in from different places."

Study solves mystery origin of Stonehenge's iconic boulders
Plan of Stonehenge using the numbering system devised by W.M. Flinders Petrie in the late 19th century. Credit: David Nash (University of Brighton)

Just how the early Britons were able to transport the boulders weighing up to 30 tons a distance of 25 kilometers remains unknown—though the prevailing idea is they were dragged along sleds. The site's significance also remains mysterious.

"I think you're looking at a very organized society there," added Nash.

As for why they picked West Woods, he said, it could have been a case of pragmatism as it was one of the closest sites.

Study solves mystery origin of Stonehenge's iconic boulders
Map showing the locations of Stonehenge and West Woods, together with possible routeways over which sarsen stones might have been transported to the monument. Credit: David Nash (University of Brighton)

But the area was also a hive of Early Neolithic activity.

It is home to a huge ancient burial site known as a barrow, a large circular earthwork, prehistoric cultivated fields that are now woodland, and a polissoir—a rock used to sharpen ancient stone axes.

Nash said that the technique the research team had devised could help answer further archaeological questions, such as the route used to transport the boulders—which can be inferred if sarsen chippings are discovered at waypoints.

He and his team also hope to use the techniques on other ancient sarsen sites scattered around Britain.

More information: D.J. Nash el al., "Origins of the sarsen megaliths at Stonehenge," Science Advances (2020). … .1126/sciadv.abc0133

Journal information: Science Advances

© 2020 AFP

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