Stonehenge Lost Knowledge and Anomalies

About Stonehenge Lost Knowledge and Anomalies

## The bluestone acoustics evidence

Six years of fieldwork on the Carn Menyn ridge — handheld hammers, contact microphones, 2007 through 2013 — found that a significant proportion of the dolerite outcrops ring like bells when struck (the project did not publish a single hard percentage). The fieldwork comes from the Landscape and Perception Project, a Royal College of Art field study led by Paul Devereux and Jon Wozencroft, who tested the outcrops between 2007 and 2013 with handheld hammers and contact microphones. Their preliminary report in *Time and Mind* (2011) — "Stonehenge Rocks: A Preliminary Report on the Incidence and Distribution of Lithophones on Carn Menyn, Preseli, Wales" — documented metallic bell-tones, gong-tones, and drum-tones across the dolerite and rhyolite outcrops, the same spotted bluestones whose chemical fingerprints match the inner ring at Stonehenge. The Preseli range is, in effect, a natural lithophone field. Local Pembrokeshire residents had known this for generations. Children there grew up tapping the boulders. The researchers were the first to map the phenomenon systematically and to publish the spatial distribution: ringing rocks cluster on the high outcrops where Neolithic quarrying scars are densest, not on the lower scree where transport would have been easiest. The builders walked past the easy stones and chose the resonant ones.

In 2014, Wozencroft's Landscape & Perception research strand at the Royal College of Art converged with the work of composer and University of Huddersfield acoustician Rupert Till, who had been studying the monument's resonance since the late 2000s. ("Songs of the Stones" is the title of Till's psychoacoustic outreach program, not the RCA strand.) Till's paper "Songs of the stones: the acoustics of Stonehenge" (IASPM Journal, 2010) established that the closed bluestone-and-sarsen geometry behaved like a resonant chamber, not an open ring. The 2020 follow-up by Trevor Cox, Bruno Fazenda, and Susan Greaney, "Using scale modelling to assess the prehistoric acoustics of Stonehenge" (*Journal of Archaeological Science*), used a 1:12 physical scale model in a semi-anechoic chamber and the full-size concrete replica at Maryhill, Washington, to back-calculate the reverberation of the intact Neolithic monument. Mid-frequency reverberation time at the rebuilt geometry came out at 0.64 ± 0.03 seconds, with speech-band amplification of 4.3 ± 0.9 decibels. The stones reflected and reinforced the human voice. They returned drum strikes as a coherent low pulse instead of a slap. They created a sonic interior measurably distinct from the surrounding plain.

That number matters because 0.6 seconds of reverberation is closer to a small chamber-music room than a concert hall — long enough for sound to feel alive and bloomed, short enough that consonants stay intelligible. Modern liturgical spaces are tuned to the same range. The current ruined monument has a reverberation closer to open ground because so many sarsens have fallen and the inner bluestone ring is half-stripped. The 0.64 figure represents the engineered original, the geometry the builders actually constructed and used. They did not stumble into this. They selected stones that ring, transported them across hundreds of kilometres, and arranged them in a geometry that doubled the sonic effect through reflection from both the inner bluestone arc and the outer sarsen wall.

The implication for the transport question is direct. If the bluestones had been chosen for color, mass, or distant spiritual provenance alone, the builders could have used local sarsen for the inner ring. Sarsen was already on site, in fact lying on the surface of Salisbury Plain in usable boulders before any quarrying began. Local sarsen does not ring meaningfully. Phonolitic spotted dolerite from Carn Menyn does. The acoustic property is intrinsic to the rock — every fragment from a ringing outcrop preserves the resonance at smaller scale, which is verifiable by anyone with a hammer and a chip of Preseli dolerite. The selection criterion was sonic, and the sonic criterion required overland and sea transport that local materials would not have demanded.

Till's psychoacoustic analysis adds a layer the geometric model cannot reach. Frequency-domain measurements at the Maryhill replica showed standing-wave reinforcement in a low-frequency band consistent with chant and percussion. The structure preferentially amplified the pitches the human ritual body would have produced. A ceremonial gathering inside the inner ring would have heard its own voice, drum, and stone-strike returned as a unified low resonance, with the high-frequency speech band sitting cleanly on top. Outside the ring, those same sounds dispersed across the open plain.

Read together, the lithophone survey and the reverberation modelling reframe the inner monument. It was an instrument, played with voice, drum, bone whistle, and stone strike, in a 0.6-second resonance pocket built specifically to amplify those sounds. The astronomical alignment placed it in the solar year. The acoustic engineering placed it in audible time. Both were tuned by the same culture, in the same building campaign, for the same ceremonial purpose.

## Transport: glacier vs human, the 2024-2025 reset

The question of how four-tonne bluestones reached Salisbury Plain from the Preseli Hills, 240 kilometres to the west, has split the field for over a century. Geologist Herbert Henry Thomas first sourced the stones to Preseli in 1923, and the human-transport assumption held until Geoffrey Kellaway in 1971 and later Aubrey Burl and geologist Brian John argued that Pleistocene glaciation had carried the stones eastward and dumped them within reach of the builders. That alternative depended on a single piece of physical evidence — the so-called Newall boulder, excavated by Robert Newall during William Hawley's 1924 dig at Stonehenge and stored at Salisbury Museum, assumed by the glacial-transport advocates to be an erratic the Neolithic builders simply picked up.

In July 2025, Richard Bevins and colleagues at Aberystwyth University published a comprehensive reanalysis of the Newall boulder in the *Journal of Archaeological Science: Reports* — "The enigmatic 'Newall boulder' excavated at Stonehenge in 1924: New data and correcting the record." Using portable XRF, automated SEM-EDS mineral mapping, optical and electron microscopy, and thin-section petrography, they showed the boulder is petrologically identical to the in-situ rhyolite pillars at Craig Rhos-y-Felin in north Pembrokeshire — the quarry Mike Parker Pearson's team had already identified for several of Stonehenge's bluestones through 2010s excavation. The boulder showed no glacial striations, no chattermarks, no faceted polishing. Its bullet-shaped profile matched the tops of the Rhos-y-Felin pillars exactly. Its size and shape mirrored buried stump 32d at Stonehenge itself, suggesting it was the broken-off upper portion of a stone the builders shaped and erected, not a chunk of ice-rafted erratic. The surface abrasion the original 1924 report attributed to glacial action turned out to be weathering plus post-breakage burial damage.

The follow-on point is geomorphological. Salisbury Plain has been carefully surveyed for erratics by the British Geological Survey for over a century. Zero glacial erratics from the west have ever been recorded on the plain — no till, no striated bedrock, no outwash deposits, no transported boulders of any non-local provenance. Even granting maximally generous Pleistocene ice extent models, the Anglian-glaciation deposit zone falls well short of the Stonehenge landscape, and the more recent Devensian limit was further north still. Brian John and a small group of holdouts continue to argue for a glacial origin in peer-reviewed and self-published work, with occasional peer-reviewed contributions in journals such as *EGQSJ*, but the evidentiary case rests almost entirely on the Newall boulder, which the 2025 reanalysis has now removed from their column. Mainstream geology has treated the matter as effectively settled.

Which leaves the engineering problem the human-transport hypothesis has always had: how four-tonne stones were moved 240 kilometres across rivers, hills, and forest by people with no wheels, no draft animals capable of that load, and no metal tools. Mike Parker Pearson's Stonehenge Riverside Project has reconstructed plausible routes — Preseli to Milford Haven by sledge, then sea passage along the Bristol Channel and around the southwestern peninsula, then up the Bristol Avon, then overland portage to the Hampshire Avon at Amesbury. Barney Harris's 2016 University College London demonstration moved a roughly one-tonne block with about ten people at approximately one mile per hour (~1.6 km/h) on greased timber rails. The crew-of-60-100 figure cited in popular accounts is a separate engineering extrapolation for moving full four-tonne bluestones over 240 km, not what the demonstration itself showed. Nothing about the route is impossible. It is, however, an extraordinary feat of organised labour, sustained over generations, for stones that could have been replaced by local sarsen at a thousandth of the effort. The acoustic selection criterion explains the cost. Without the lithophone property, the bluestone transport is irrational. With it, the project becomes the deliberate construction of a sonic instrument that no other rock available within 200 kilometres could supply.

## The Altar Stone goes Scottish (2024)

In August 2024, a paper in *Nature* — "A Scottish provenance for the Altar Stone of Stonehenge," lead author Anthony J. Clarke at Curtin University in Perth, Australia, with Richard Bevins, Nick Pearce, and Rob Ixer — overturned a century of settled assumption. The Altar Stone, the recumbent six-tonne sandstone slab lying flat at the heart of the monument, had been classed as Old Red Sandstone from south Wales since H. H. Thomas's 1923 work, and the Welsh-only model for Stonehenge's imported stones was treated as essentially closed. Clarke's team analysed detrital zircon, apatite, and rutile grains from Altar Stone fragments using laser-ablation inductively-coupled-plasma mass spectrometry. The mineral ages and chemistry produced a fingerprint matching no Welsh source. They matched the Old Red Sandstone of the Orcadian Basin in northeast Scotland, more than 750 kilometres from Stonehenge in a straight line — and considerably further by any plausible Neolithic route. Welsh Old Red Sandstone shows a distinct mid-Silurian zircon signature; the Altar Stone's signature was Mesoproterozoic and Archaean, dominated by mid-Ordovician rutile and apatite, a profile that fits the Orcadian Basin and almost nowhere else in Britain.

A follow-up study in *Journal of Archaeological Science: Reports* (2024), also by Bevins and colleagues — "Was the Stonehenge Altar Stone from Orkney? Investigating the mineralogy and geochemistry of Orcadian Old Red sandstones and Neolithic circle monuments" — narrowed the source within the basin. The team ruled out mainland Orkney as the source and pointed to Caithness, Sutherland, Aberdeenshire, or Shetland as targets for further work — without singling out any one as the confirmed origin. Localising the source within the Orcadian Basin is ongoing. The broader Orcadian Basin sourcing held. The likeliest route is sea: the stone moved down the east coast of Britain by raft or hide-hulled boat, around East Anglia, and inland up a southern river system, possibly the Thames-Kennet route. Overland is geometrically possible but requires crossing every major drainage of central Britain through dense Neolithic forest. Sea transport is what a coastal culture with the Orkney boat-building tradition would have used.

What this implies is the reach of third-millennium-BC coordination. The Altar Stone's journey is the longest documented for any megalith of any Neolithic monument anywhere in the world. The communities of the Orcadian Basin in northeast Scotland, the Welsh Preseli range, and Salisbury Plain were not isolated tribes who happened to share pottery styles and grooved-ware decoration. They were nodes in a network capable of locating a specific sandstone in the far north, quarrying a six-tonne block, moving it the length of the British Isles, and integrating it as the ceremonial centerpiece of a monument 750 kilometres south. That kind of project requires shared cosmology to motivate the destination, shared craft standards to coordinate the quarrying, navigation skill to manage a multi-week sea passage, multi-generational planning to sustain the effort beyond a single human lifetime, and political stability across a thousand kilometres of coast. Stonehenge stops being a regional Wessex shrine and becomes the convergence point of an island-wide ritual federation linking Orkney's Brodgar-Stenness complex, the wider Orcadian Basin sandstone country, the Preseli quarries, and Salisbury Plain into a single sacred geography.

## Healing-stone tradition and the Aquae Sulis-style frame

Pembrokeshire folklore preserves a tradition that water poured over Preseli bluestone, or springs running through the Preseli range, carry healing properties. Cures are recorded in 18th and 19th century antiquarian collections for skin disease, eye complaints, livestock infection, and post-partum recovery. The Carn Menyn stones in particular were associated with curative water rites well into the early modern period. Local wells dressed with bluestone fragments survived in folk practice into the twentieth century, and several springs in the Preseli foothills retained their reputation as healing sites long after Christianisation overlaid the older shrines with saints' names.

This dovetails with the SPACES project — Strumble-Preseli Ancient Communities and Environment Study — directed by Timothy Darvill at Bournemouth University and the late Geoffrey Wainwright, formerly Chief Archaeologist of English Heritage. Their 2008 excavation inside the Stonehenge bluestone circle, only the second authorised inside the monument since the 1960s, recovered hammerstones, antler picks, and a charcoal sequence that pushed the bluestone arrival date back to the 25th century BC, somewhat earlier than previously assumed. Their interpretation, controversial when published in the *Antiquaries Journal* (2009), frames Stonehenge as a Neolithic Lourdes — a healing destination people travelled to, drawing on the curative reputation of the Preseli stones at their geological source. Darvill and Wainwright pointed to the unusually high proportion of skeletal remains from the surrounding burial grounds that show evidence of trauma, deformity, or chronic illness, arguing the cemetery population was self-selected by people seeking cure. The Amesbury Archer, found in 2002 three miles south of the monument with a healed but severely abscessed left knee, an extra molar tooth, and isotopic signatures pointing to an Alpine origin in central Europe, most likely modern Switzerland or the Alpine foothills of Germany/Austria, fits this frame: a person who travelled the length of Europe to reach the stones.

Geoffrey of Monmouth's *Historia Regum Britanniae* (c. 1136) records what may be a fragment of preserved Neolithic memory. In the "Giants' Dance" episode, the wizard Merlin transports a circle of curative stones from Mount Killaraus in Ireland to Salisbury Plain to commemorate British nobles slain by Saxons. The giants, Geoffrey writes, originally brought the stones from the farthest coast of Africa for their healing properties, and at Mount Killaraus the sick were bathed in water poured over the stones to cure their wounds. The Welsh provenance is wrong and the African origin is mythical, but the structural elements of the legend — distant origin, water rite, healing power, ceremonial transport across the sea — preserve the actual practice the SPACES project finds in the archaeology and the folklore. Geoffrey wrote four thousand years after the bluestones were raised. That a coherent narrative of distant healing-stones-moved-by-extraordinary-means survived that long suggests the practice was distinctive enough to imprint itself on cultural memory across multiple language replacements and religious shifts.

There is precedent for the Romano-British layer. When Rome reached Britain, healing springs were not invented; they were absorbed. Bath was already a pre-Roman cult site sacred to the goddess Sulis before it became Aquae Sulis under Roman patronage. The same pattern of water-plus-stone-plus-cure was already in use at Stonehenge two and a half millennia earlier. The pattern reads continuous, not invented. Bluestone water rites at Stonehenge are likely the deepest layer of that British healing-water tradition, and the one with the greatest geographical reach. The Preseli outcrops, the Stonehenge inner ring, the Pembrokeshire holy wells, the Roman Bath, and the medieval shrine at Walsingham all sit on the same long line of British sacred-water practice, with the Stonehenge example as its earliest fully engineered expression.

## Underground geophysics: hidden monuments and the buried landscape

Most of what surrounds Stonehenge is invisible. The Stonehenge Hidden Landscapes Project, run from 2010 to 2014 by the University of Birmingham under Vince Gaffney and the Ludwig Boltzmann Institute for Archaeological Prospection in Vienna under Wolfgang Neubauer, used magnetometry, ground-penetrating radar, and electromagnetic induction across twelve square kilometres of the World Heritage Site. They mapped what plough and turf had hidden for five thousand years.

The largest find sat under Durrington Walls, the late-Neolithic earthwork two miles northeast of Stonehenge already known for its feasting deposits and timber circles. The geophysics revealed a row of up to ninety standing stones, some originally up to 4.5 metres tall, ringed inside the bank-and-ditch enclosure. Most had been pulled out and the stone-holes packed with chalk in antiquity, with a smaller number left buried in situ. The Durrington Walls super-henge had been a stone monument before it was an earthwork — predating or contemporary with the sarsen circle at Stonehenge itself. The 2018 follow-up paper in *Archaeological Prospection* (Gaffney et al., "Durrington Walls and the Stonehenge Hidden Landscape Project 2010-2016") mapped further pits, segmented ditches, post alignments, and a cursus-orientated processional way previously invisible from the surface. A 2020 supplementary survey added a ring of twenty large shafts, approximately ten metres in diameter and five metres deep, encircling Durrington Walls in a 2-kilometre-diameter pattern interpreted as a possible boundary or sound-marker enclosure.

The Greater Cursus rewrote itself similarly. The geophysics found pits at its eastern and western ends, and the eastern pit aligned with the midsummer sunrise as seen from Stonehenge — suggesting the cursus functioned as a horizon-marker device a thousand years before Stonehenge's sarsens went up. The visible monument is one component of a built ritual landscape spanning four kilometres of integrated earthworks, stone settings, processional ways, and astronomical sightlines, with the entire complex pre-planned across multiple generations. The single-monument framing does not survive the data. Stonehenge as it stands is the centerpiece of a far larger sacred geography, most of which remains underground and most of which is now invisible to the visitor walking the site.

## Open question: who replaced who?

The harder question the genetics has forced. Iñigo Olalde's 2018 *Nature* paper, "The Beaker phenomenon and the genomic transformation of northwest Europe," sequenced 400 ancient genomes and found that within a few centuries of 2400 BC, roughly ninety percent of the British gene pool turned over. The Beaker-associated steppe ancestry, Y-chromosome haplogroup R1b, replaced the Neolithic farmer ancestry that had built Stonehenge. The people who quarried the bluestones, dragged the Altar Stone from Orkney, and engineered the acoustics did not pass their genes to modern Britain. Their inheritors did not maintain the techniques. Bluestone monument-building stops within a few centuries of the replacement. The lithophone selection criterion, the sea-route coordination, the inter-island federation — that knowledge ends with the population that held it. What survived in folklore at Preseli, in Geoffrey of Monmouth's transcription, and in the stones themselves is what was left when the people who knew were gone.

Significance

The standard tour-guide Stonehenge is a stone calendar — solstice axis, lunar standstill, big rocks pointed at the sky. The 2010s and 2020s evidence reframes it as something more demanding: a multi-modal ritual instrument deliberately engineered to do specific perceptual work on the people inside it.

The acoustic case is the spine. A significant proportion of the rocks at Carn Menyn ring like bells when struck — a property documented by the Landscape and Perception Project at the Royal College of Art and reported in the *Time and Mind* lithophone survey (the project did not publish a single hard percentage). That property is intrinsic to spotted dolerite, the exact rock chosen for the inner bluestone ring. The selection criterion was sonic. Rupert Till's scale-modelling work on the rebuilt monument geometry produced a 0.64-second reverberation time and a 4.3 dB voice amplification — a tuned resonance pocket the size of a small concert hall. Voice, drum, and stone strike returned coherent. The interior was an aural environment distinct from the open plain.

The transport question is no longer open. The 2025 Newall boulder reanalysis closed the last evidentiary leg of the glacial-erratic theory. The four-tonne bluestones moved 240 kilometres because human crews moved them. The 2024 Altar Stone *Nature* paper extended the network 750 kilometres further: the ceremonial centrepiece was quarried in northeast Scotland and brought south, the longest known megalithic transport of any Neolithic monument anywhere. That is not a regional shrine. It is the convergence point of an island-wide ritual federation with shared cosmology, navigation, and multi-generational planning capacity.

The healing layer threads through. Pembrokeshire folklore preserved a bluestone water-cure tradition into the modern period. Darvill and Wainwright's SPACES excavation framed Stonehenge as a Neolithic destination for the sick — Lourdes before Lourdes, Aquae Sulis before Sulis. Geoffrey of Monmouth's *Historia* preserves the structural memory: distant stones, water rite, cure. The Amesbury Archer, isotopically Alpine and physically broken, fits the destination-pilgrim pattern exactly.

Hidden Landscapes Project geophysics dissolved the single-monument frame. Ninety buried stones at Durrington Walls. Solstice-aligned pits at the Greater Cursus a thousand years before the sarsens. Four kilometres of integrated ritual landscape under turf.

What this adds up to: the original builders selected resonant stone, transported it across an island, tuned the geometry for voice and percussion, integrated water rites for healing, and embedded the structure in a landscape of aligned earthworks and processional ways. They did this without writing, wheels, draft animals, or metal. Then around 2400 BC, a population replacement at the ninety-percent level ended the lineage. The inheritors kept some folklore, kept the stones standing, but did not maintain the techniques. Stonehenge survives as the most complete material record of a knowledge tradition the genome no longer carries.

Connections

Further Reading

• ## Primary research
• Clarke, A. J., Kirkland, C. L., Bevins, R. E., Pearce, N. J. G., Glorie, S., & Ixer, R. A. (2024). **A Scottish provenance for the Altar Stone of Stonehenge.** *Nature*, 632, 570-575. [https://www.nature.com/articles/s41586-024-07652-1](https://www.nature.com/articles/s41586-024-07652-1) — the paper that overturned a century of Welsh-only assumption.
• Bevins, R. E., Ixer, R. A., Pearce, N. J. G., Pirrie, D., Andò, S., Hillier, S., Turner, P., & Power, M. (2025). **The enigmatic 'Newall boulder' excavated at Stonehenge in 1924: New data and correcting the record.** *Journal of Archaeological Science: Reports*, 64. [https://www.sciencedirect.com/science/article/pii/S2352409X25003360](https://www.sciencedirect.com/science/article/pii/S2352409X25003360) — the petrographic reanalysis that closed the glacial-erratic case.
• Bevins, R. E. et al. (2024). **Was the Stonehenge Altar Stone from Orkney? Investigating the mineralogy and geochemistry of Orcadian Old Red sandstones and Neolithic circle monuments.** *Journal of Archaeological Science: Reports*. [https://www.sciencedirect.com/science/article/pii/S2352409X24003663](https://www.sciencedirect.com/science/article/pii/S2352409X24003663) — narrowed the Scottish source within the Orcadian Basin and ruled out mainland Orkney.
• Olalde, I. et al. (2018). **The Beaker phenomenon and the genomic transformation of northwest Europe.** *Nature*, 555, 190-196. [https://www.nature.com/articles/nature25738](https://www.nature.com/articles/nature25738) — the 90 percent population-replacement paper.
• ## Acoustic studies
• Till, R. (2010). **Songs of the Stones: An Investigation into the Acoustic History and Culture of Stonehenge.** *IASPM Journal*, 1(2). [https://iaspmjournal.net/index.php/IASPM_Journal/article/view/308/0](https://iaspmjournal.net/index.php/IASPM_Journal/article/view/308/0)
• Cox, T. J., Fazenda, B. M., & Greaney, S. E. (2020). **Using scale modelling to assess the prehistoric acoustics of Stonehenge.** *Journal of Archaeological Science*, 122. [https://www.sciencedirect.com/science/article/pii/S0305440320301394](https://www.sciencedirect.com/science/article/pii/S0305440320301394) — the 0.64 ± 0.03 s reverberation figure and 4.3 dB speech amplification.
• Devereux, P. (2011). **Stonehenge Rocks: A Preliminary Report on the Incidence and Distribution of Lithophones on Carn Menyn, Preseli, Wales.** *Time and Mind*, 4(2). [https://www.tandfonline.com/doi/abs/10.1080/1751696X.2011.10757763](https://www.tandfonline.com/doi/abs/10.1080/1751696X.2011.10757763) — the field survey behind the lithophone finding.
• Royal College of Art, **Landscape & Perception** research strand led by Jon Wozencroft and Paul Devereux ("Songs of the Stones" is Till's psychoacoustic outreach program, not the RCA strand name). [https://www.rca.ac.uk/news-and-events/news/rca-research-team-uncovers-stonehenges-sonic-secrets/](https://www.rca.ac.uk/news-and-events/news/rca-research-team-uncovers-stonehenges-sonic-secrets/)
• ## Hidden landscape and excavation
• Gaffney, V. et al. (2018). **Durrington Walls and the Stonehenge Hidden Landscape Project 2010-2016.** *Archaeological Prospection*, 25(3), 255-269. [https://onlinelibrary.wiley.com/doi/full/10.1002/arp.1707](https://onlinelibrary.wiley.com/doi/full/10.1002/arp.1707) — the 90 buried stones at Durrington and the wider geophysical survey.
• Hawley, W. (1921, 1922, 1923, 1924, 1925, 1926, 1928). **Reports on the Excavations at Stonehenge.** *Antiquaries Journal*, vols. 1-8 — the original interwar excavation reports, including the 1924 Newall boulder context that the 2025 paper reinterprets.
• ## Synthesis and context
• Pearson, M. P. (2012). **Stonehenge: Exploring the Greatest Stone Age Mystery.** Simon & Schuster — the Stonehenge Riverside Project director's accessible synthesis covering transport routes, Durrington Walls feasting, and the burial chronology.
• Darvill, T., & Wainwright, G. (2009). **Stonehenge Excavations 2008.** *Antiquaries Journal*, 89, 1-19 — the SPACES inner-circle excavation that recalibrated the bluestone arrival date and proposed the healing-site interpretation.
• Geoffrey of Monmouth (c. 1136). **Historia Regum Britanniae**, Book VIII — the Giants' Dance / Merlin transport legend, useful as a textual artefact preserving folk memory rather than as historical record.