A new geological analysis has settled a long-running argument about one of England’s most striking prehistoric monuments, and the answer involves more raw labor than most visitors standing beneath the stones would guess. Researchers now say the enormous pillars known as the Devil’s Arrows were quarried far from where they stand and deliberately moved there by hand, not shifted into place by retreating glaciers as some earlier theories held.
The Devil’s Arrows at Boroughbridge
The three surviving megaliths sit in a row near Boroughbridge in North Yorkshire, forming what is regarded as the tallest prehistoric stone alignment still standing in Britain. Researchers built their case using detailed geological fingerprinting of the rock itself, comparing mineral composition and texture against candidate quarry sites across the region rather than relying on visual similarity alone. Local legend holds that the stones take their name from a tale of the devil hurling them at a nearby church and missing, a story that long predates any scientific attempt to explain how three such massive blocks came to stand in a flat river valley with no natural outcrop nearby.
Antiquarian visitors as far back as the seventeenth century puzzled over the same basic question that has now been answered geologically: gritstone of this kind simply does not occur naturally at Boroughbridge, so any explanation has to account for the stone traveling a meaningful distance before it was shaped and raised.
Twenty-Five Tonnes, Eighteen Kilometres
The study concludes each stone weighs roughly 25 tonnes and was moved at least 18 kilometres from its source, an effort that would have required a large, organized labor force working with ropes, timber rollers or sledges, and likely months of planning around the terrain between quarry and site. The tallest of the three stones, the southern pillar, rises to approximately 6.86 metres above ground, with a base buried further still, meaning the true quarried block was even larger before it was shaped and erected.
Ruling Out Brimham Rocks’ Neighbor
Previous proposals had pointed to Plumpton Rocks as a plausible source given its relative proximity, and separately, natural glacial transport had been floated as an explanation for how such large blocks ended up in a lowland setting far from any exposed bedrock outcrop. The new geological evidence rules out Plumpton Rocks and instead traces the stone to Brimham Rocks, a rugged gritstone outcrop in North Yorkshire known today for its wind-sculpted formations. That distinction matters because it confirms human agency rather than glacial deposition: builders chose a specific, distant source rather than using whatever large stone happened to be lying nearby.
Dating the Monument to the Late Neolithic
The stones are believed to have been transported and erected during the Late Neolithic or Early Bronze Age, with researchers pointing to a date around 2000 BCE. That places the Devil’s Arrows in the same broad era as other major stone-moving projects across Britain, including the sourcing of Stonehenge’s bluestones from Wales, and adds another data point to a growing picture of prehistoric communities capable of coordinating long-distance haulage of multi-tonne loads well before the introduction of wheeled transport or draft animals for that purpose.
What Deliberate Sourcing Says About Neolithic Society
Choosing a source 18 kilometres away, when closer stone existed, suggests the selection was not incidental. Researchers argue the specific gritstone from Brimham Rocks may have carried symbolic or practical value, such as its texture, color, or durability, that made it worth the added transport cost. The study was published in the Proceedings of the Royal Society A, a mathematical and physical sciences journal, reflecting the technical, materials-science approach the team took to answering what had previously been treated mostly as a folklore question.
Why the Monument Still Draws Debate
Unlike Stonehenge, the Devil’s Arrows sit in a lowland field rather than an open plain, and their function has never been fully explained; theories range from a ceremonial procession route to an astronomical marker. The new sourcing data does not resolve that question, but it does close off one of the more persistent alternative explanations for how the stones arrived, reinforcing that their placement was a deliberate act of construction rather than an accident of geology.
How the Haul Compares to Other Prehistoric Feats
Moving a 25-tonne block 18 kilometres without wheels, draft animals, or metal tools would have demanded a workforce numbering well into the dozens, working in coordinated shifts over rough, unpaved ground that likely included river crossings and gradient changes along the route from Brimham Rocks to Boroughbridge. Experimental archaeology on comparable megalithic transport elsewhere has generally shown that timber sledges dragged over greased or wetted wooden rails, combined with rope teams pulling in unison, offer the most plausible method for loads of this size, though the exact technique used for the Devil’s Arrows remains untested by direct replication. What the finding underscores is less the mechanics of the haul than the social organization it implies: a community able to mobilize sustained collective labor for a monument with no obvious defensive or agricultural payoff, purely for whatever ceremonial or symbolic purpose the stones were meant to serve.
This article was created with the assistance of AI and reviewed by an editor.
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