A Fingerprint at Stonehenge Changes Everything We Know
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A chemical fingerprint taken of Stonehenge's Altar Stone reveals that it isn't from Wales, as was previously understood.
Instead, researchers believe that the stone came from the Orcadian Basin in Scotland—roughly 466 miles away from the Stonehenge site.
While upending previous research, the find also raises questions about how trade networks may have helped transport the stone to the site.
Stonehenge offers mysteries aplenty. Just when we think we've solved one, we have to re-solve questions we thought were already answered. Such is the case with the origin story of the Altar Stone—one of the roughly 80-plus stones still on site in southern England.
The stones of Stonehenge feature a variety of compositions and originate from a number of potential source locations. Scholars previously believed that they knew most of what there was to be known about the Altar Stone—the largest of the non-sarsen stones on site, which is now partially buried beneath two fallen stones. But researchers led by a team from Curtin University may have just upended that history, writing that a stone long believed to originate from Wales actually hails from Scotland.
By studying the age and chemistry of mineral grains within fragments of the six-ton Alter Stone—a thick sandstone block measuring 16 feet by 3 feet in the center of the iconic Wiltshire circle—the team crafted a chemical fingerprint of the stone. That chemical composition matched that of rocks from northeast Scotland, and clearly differentiated it from Welsh bedrock.
'Our analysis found specific mineral grains in the Altar Stone are mostly between 1,000 to 2,000 million years old, while other minerals are around 450 million years old,' Anthony Clarke, lead author and Ph.D. student from the Timescales of Mineral Systems Group at Curtin's School of Earth and Planetary Sciences, said in a statement. 'This provides a distinct chemical fingerprint suggesting the stone came from rocks in the Orcadian Basin, Scotland, at least 750 kilometers [466 miles] away from Stonehenge.'
According to English Heritage, the Altar Stone is a large slab of greenish Old Red Sandstone. Recent geological research had pinpointed the source of the stone to the Brecon Beacons area of southeast Wales. But the new study, which was published today in the journal Nature, discounts that reigning theory.
Richard Bevins, study co-author and professor at Aberystwyth University, said in a statement that with the chemical fingerprint tracing the iconic rock to Scotland, the hunt for its exact point of origin starts now.
Clarke said that the Scottish origins of the stone raise fascinating question regarding how such a massive stone was transported so far during the Neolithic era of roughly 2,600 BC. It must have required, the authors claim, an unexpectedly advanced transport method and complex societal organization.
'Our discovery of the Altar Stone's origins highlights a significant level of societal coordination during the Neolithic period and helps paint a fascinating picture of prehistoric Britain,' Chris Kirkland, study co-author and Curtin professor, said in a statement. 'Transporting such massive cargo overland from Scotland to southern England would have been extremely challenging, indicating a likely marine shipping route along the coast of Britain. This implies long-distance trade networks and a higher level of societal organization than is widely understood to have existed during the Neolithic period in Britain.'
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