Researchers from Curtin University have provided strong evidence that ancient humans, rather than glaciers, transported the bluestones to Stonehenge. By analyzing river sediments near the site, they found no glacial signatures, supporting the idea of deliberate human effort. The findings challenge a long-standing debate in archaeology.
For over a century, archaeologists have debated how the massive bluestones arrived at Stonehenge on England's Salisbury Plain. A new study from Curtin University in Australia offers compelling evidence that Neolithic people intentionally moved these stones from distant locations, likely Wales or Scotland, rather than relying on natural glacial transport.
The research team employed advanced mineral fingerprinting techniques to examine sediments in rivers near Stonehenge. They analyzed more than 500 zircon crystals—durable minerals that preserve geological histories—using equipment at Curtin's John de Laeter Centre. Lead author Dr. Anthony Clarke, from the Timescales of Mineral Systems Group in Curtin's School of Earth and Planetary Sciences, explained the absence of glacial evidence: "If glaciers had carried rocks all the way from Scotland or Wales to Stonehenge, they would have left a clear mineral signature on the Salisbury Plain."
The team searched for tiny grains in the river sands that would indicate past ice movement but found none. "We looked at the river sands near Stonehenge for some of those grains the glaciers might have carried and we did not find any," Dr. Clarke said. "That makes the alternative explanation—that humans moved the stones—far more plausible."
While the study confirms human involvement, the exact methods remain elusive. Dr. Clarke noted possible techniques like sailing the stones or using logs for overland transport, but added, "But what we do know is ice almost certainly didn't move the stones."
Co-author Professor Chris Kirkland highlighted the role of modern tools in unraveling ancient puzzles: "Stonehenge continues to surprise us. By analyzing minerals smaller than a grain of sand, we have been able to test theories that have persisted for more than a century."
This work builds on a 2024 Curtin discovery linking the six-tonne Altar Stone to Scotland, reinforcing the notion of long-distance stone sourcing by prehistoric builders. The study, titled 'Detrital zircon-apatite fingerprinting challenges glacial transport of Stonehenge's megaliths,' appears in Communications Earth and Environment.