Are Stonehenge's Sarsens Really From West Woods?

A reanalysis of the sarsen fragments from Stonehenge argues that they point to many more sources than expected, some perhaps as far off as Sussex and Kent. The obvious question follows: does that unsettle the idea that the great standing stones came from West Woods?

When sarsen sourcing makes the news it is usually about the monoliths — the conclusion, from Nash and colleagues in 2020, that fifty of the fifty-two surviving standing sarsens share the chemistry of West Woods, on the Marlborough Downs about 25 km away. Less attention goes to the smaller stone fragments dug up across the site. When Ciborowski and colleagues analysed 54 of these in 2024 they called them debitage — a knapping term for the waste struck off while working stone — and found them more varied than the monoliths, drawn from at least three regions beyond West Woods.

A new paper in Archaeological and Anthropological Sciences — Michelaki, Barham, Gorton, Mahaney, Aufreiter and Hancock (2026) — reworks that same fragment dataset using raw element concentrations rather than the zirconium-normalised ratios of the original, and argues the picture is more varied still. I can’t judge the geochemistry, so what follows is what the paper claims.

The new paper makes a deliberate point of not calling this material debitage. It prefers the neutral “fragments,” on the grounds that “debitage” presumes human workmanship — waste from dressing stone — whereas some of these pieces may be natural detritus, weathered off bedrock and never worked by anyone. The distinction is not pedantry: as we shall see, it bears directly on what the fragments can and cannot tell us about the standing stones.

Fragments from all over

On the paper’s sorting, 33 of the 54 fragments can be tentatively tied to known sarsen sources, while the remaining 21 cannot be placed at all and appear to represent at least seven chemistries not documented anywhere yet. Some fragments are tentatively matched to sources well to the south-east — Hampshire, and possibly Sussex and Kent — though the authors are careful to say there are inadequate data to make any of these assignments firm.

They draw one striking implication from that. If some fragments really do derive from south-east England, which the last ice sheet never reached, then ice cannot have carried them, and intentional human transport over long distances is the only explanation left — a reading that fits the wider argument, made by Parker Pearson and colleagues, that Stonehenge deliberately gathered stone from across Britain. For once a critique from the Hancock group cuts against the glacial-transport idea rather than for it.

But the fragments are not the standing stones

Here is the distinction that matters, and that a quick headline will tend to blur. The fragments and the monoliths are not the same population of stone. They need not all come from dressing the great sarsens at all: some may be packing stones, hammerstones or pieces of broken-up earlier features, and — on the very point the paper’s terminology is at pains to keep open — some may be natural detritus that was never part of any worked stone. A varied bag of fragments is therefore perfectly compatible with a uniform set of standing stones. Indeed the original 2024 study already found the fragments more diverse than the monoliths; this paper widens that gap, but it does not invent it.

So finding more sources in the rubble does not, on its own, move the monoliths. The West Woods case for the standing stones rests on a different body of evidence — the analyses of the stones themselves, the Stone 58 core, the proximity of a large, dense silcrete field at the right distance, and the recent extension of the same chemistry to the outlying Cuckoo and Tor Stones. None of that is reanalysed here.

Where it does reach the monoliths

Two threads do connect back to the big stones, and they pull in the cautious direction.

The first is the method itself. If, as the paper argues, normalising every element to zirconium can mask real differences and manufacture apparent agreements — a hazard it says is acute when raw concentrations range over more than a factor of ten, as these do — then that charge applies wherever the technique was used, the monoliths included. The standing stones were placed at West Woods with the same normalised approach. The data behind that conclusion aren’t revisited here, but the tool used to reach it is exactly what the paper is questioning.

The second is more concrete, and I have checked it against the original data. Nash et al. published the full chemistry behind their conclusion, and only one Stonehenge monolith appears in it with the high-precision analyses that source-matching requires: the Phillips’ Core drilled from Stone 58 in the 1950s. The other fifty-odd standing stones were measured only by the coarser portable XRF, and were never individually tested against the sources this way — their West Woods attribution rests on resembling Stone 58, not on being matched to a source themselves. So “re-sourcing the monoliths” really comes down to re-sourcing Stone 58.

Running its core against all twenty source areas, the answer depends entirely on the method — and the dependence runs one way. The more the calculation leans on normalising to zirconium, the better West Woods looks; strip that step out and rank the sources on raw concentrations, as the critics prefer, and West Woods slides down the table.

Approach used on Stone 58’s core	Nearest source(s)	West Woods rank
Geometric mean of element/Zr ratios (Nash & Ciborowski’s own method)	West Woods	1st of 20
Element/Zr ratios, nearest-neighbour distance	Bramdean, Castle Rising	3rd
Raw concentrations, nearest-neighbour distance	Castle Rising, Piggledene	6th
Raw concentrations, ±50% agreement count	Castle Rising, Piggledene	8th

Under Nash and Ciborowski’s own geometric-mean method West Woods comes top, with a real margin — that is how they reached their result, and it is not a marginal call on their own terms. Without the normalising step, West Woods falls to sixth or eighth and the nearest neighbours become Castle Rising and Piggledene. So the assignment is real under one method and gone under another, and the thing doing the work is the zirconium step that both critique papers are arguing about.

Two caveats keep this honest, and both cut against over-reading it. The distant front-runner, Castle Rising in Norfolk, almost certainly owes its place to an accident of scale: Stone 58 is very low in zirconium, Castle Rising lower still, and a raw-concentration comparison simply rewards stones that are uniformly low — the very dilution effect that normalising to zirconium was meant to cancel. And the other near neighbour, Piggledene, lies about two kilometres from West Woods on the same stretch of the Marlborough Downs; on the geology they are all but the same place. So the non-normalised re-sort does not move Stone 58 off the Downs at all. It simply cannot separate West Woods from the source next door, while coughing up one spurious long-distance match. What it shows is not a different source, but that the headline precision — this stone, that hillside — is more fragile than it looks.

So what happens to West Woods?

On the strength of this paper, West Woods is not overturned as the source of the standing sarsens, and the authors do not claim it is. What erodes a little is the confidence attached to the headline figure. “Fifty of fifty-two from West Woods” is a tidy number; the picture from the fragments — many sources, much undocumented variability, signatures that overlap and won’t cleanly separate — and the behaviour of Stone 58 above, which can’t be told from its neighbouring valley once you change the sum, both point the same way: the silcrete chemistry of southern Britain may be too smeared-together for any single method to pin a stone to one hillside with great precision. That is a caution about resolution, not a new provenance.

It is also now the second such caution in a matter of weeks, after Pearce, Bevins, Ixer and Pirrie’s comment on the related arithmetic-similarity method. The two come from opposite ends of the field and agree on little else, but they converge on one unglamorous point: don’t let a processed number stand in for the raw data, and check every match against the plots and the petrography. The most likely upshot is not that West Woods is wrong, but that the next round of sourcing will have to lean less on a single clever statistic and more on the unglamorous business of looking hard at the rock.

Under Nash and Ciborowski’s own geometric-mean method, West Woods is the closest of all twenty sources, with a real margin — that is how they reached their result, and it is not a marginal call on their own terms. Read the same data without normalising, scoring each source by how many elements fall within ±50% of Stone 58, and West Woods drops into the bottom half. The table below shows every source on that non-normalised basis, closest first.

Source area (mean of 3)	Zr	Ba	Sr	TiO2	Hf	Nb	Y	Pass
Castle Rising	25	6.47	1.63	0.04	0.63	0.9	1.33	7/7
Piggledene	62	10.37	1.7	0.05	1.57	0.87	1.33	5/7
Lewes Road	56.67	64.7	11.23	0.05	1.17	1.03	1.17	4/7
Bramdean	60.67	30.83	5.17	0.05	1.27	1.33	1.13	4/7
Stoney Wish	77.67	35.83	4.5	0.06	1.8	1.27	1.2	3/7
Clatford Bottom	98	10.23	1.77	0.11	2.47	2.07	2.63	2/7
Standean	83.33	56.63	11.17	0.05	1.8	1.33	1.83	2/7
Sudbury	49.67	23.3	22.2	0.09	1.3	1.6	3.57	2/7
West Woods	96.33	32.43	1.83	0.12	2.27	2.4	2.2	1/7
Lockeridge Dene	133.33	17.67	2.47	0.13	3.33	2.3	2.53	1/7
Monkton Down	225	33.9	5.6	0.21	5.17	4.53	4	0/7
Totterdown Wood	188	19.6	4.13	0.09	4.67	2	2.13	0/7
Blue Bell Hill	201.67	91.83	10.43	0.15	4.67	3.8	1.83	0/7
Gestingthorpe 1	106.33	48.43	11.97	0.11	2.53	1.83	2.2	0/7
Mutter's Moor 1	415.67	140.83	13.3	1.75	10.2	32.8	7.17	0/7
Mutter's Moor 2	471.33	245	14.27	1.42	11.33	25.97	6.77	0/7
Valley of the Stones 1	436.67	88.8	8.2	0.56	10.47	10.67	5	0/7
Valley of the Stones 2	415.33	83.6	6.9	0.47	9.63	8.97	4.53	0/7
Lenham Quarry	433.33	58.73	10.73	0.28	9.73	6.17	3.13	0/7
Gestingthorpe 2	115.33	83.07	163.83	0.11	2.8	2.23	9.77	0/7
Stone 58 (reference)	37.67	12.1	1.27	0.06	1	1	1.13	–

within ±50% of the Stone 58 mean    outside ±50% (below 0.5× or above 1.5×). ICP-MS/AES data, Nash et al. (2020); ppm except TiO₂ (%).

On the fuller 12-element mean comparison West Woods passes 4 of 12, Castle Rising 11 of 12 and Piggledene 9–10 of 12 — but Piggledene fails on zirconium itself, the primary sorting element. The table shows where Stone 58 is not (West Woods) more reliably than where it is: the green for Castle Rising and Piggledene arises largely because all three are uniformly low in every trace element, so a ±50% test is easily met — the dilution effect that normalising to zirconium is meant to cancel. Piggledene also lies ~2 km from West Woods on the same downs. The table therefore shows non-resolution, not a Norfolk or Piggledene source for Stone 58.

References

Michelaki, K., Barham, D., Gorton, M. P., Mahaney, W. C., Aufreiter, S., and Hancock, R. G. V. 2026. “Geochemical Data Treatment and Interpretive Uncertainty: A Reanalysis of Stonehenge Stone Fragments (‘Debitage’).” Archaeological and Anthropological Sciences 18: 162. doi:10.1007/s12520-026-02518-1.

Ciborowski, T. J. R., Nash, D. J., Darvill, T., Chan, B., Parker Pearson, M., Pullen, R., Richards, C., and Anderson-Whymark, H. 2024. “Local and Exotic Sources of Sarsen Debitage at Stonehenge Revealed by Geochemical Provenancing.” Journal of Archaeological Science: Reports 53: 104406. doi:10.1016/j.jasrep.2024.104406.

Harding, P., Nash, D. J., Ciborowski, T. J. R., Maniatis, G., and Colman, K. 2024. “Earliest Movement of Sarsen Into the Stonehenge Landscape: New Insights from Geochemical and Visibility Analysis of the Cuckoo Stone and Tor Stone.” Proceedings of the Prehistoric Society 90: 229–251 (published online January 2025). doi:10.1017/ppr.2024.13.

Nash, D. J., Ciborowski, T. J. R., Ullyott, J. S., Parker Pearson, M., Darvill, T., Greaney, S., Maniatis, G., and Whitaker, K. A. 2020. “Origins of the Sarsen Megaliths at Stonehenge.” Science Advances 6(31): eabc0133. doi:10.1126/sciadv.abc0133.

Parker Pearson, M., Bevins, R., Bradley, R., Ixer, R., Pearce, N., and Richards, C. 2024. “Stonehenge and Its Altar Stone: The Significance of Distant Stone Sources.” Archaeology International 27(1): 113–137. doi:10.14324/AI.27.1.13.

Pearce, N. J. G., Bevins, R. E., Ixer, R. A., and Pirrie, D. 2026. “Arithmetic Approaches Alone Are Inadequate in Defining Similarity.” Journal of Archaeological Science: Reports: 105874. doi:10.1016/j.jasrep.2026.105874.

The Numbers Ain’t Enough

Reporting the arguments in a new comment paper on geochemical similarity methods

A comment paper has now been published in the Journal of Archaeological Science: Reports examining an arithmetic method for assessing geochemical similarity between artefacts and potential sources.

Pearce, N. J. G., Bevins, R. E., Ixer, R. A., and Pirrie, D. 2026. “Arithmetic Approaches Alone Are Inadequate in Defining Similarity: A Comment on Ciborowski and Nash 2026 ‘Defining Similarity: An Arithmetic Method for Archaeological Source Provenance Targeting Using Geochemical Data’.” Journal of Archaeological Science: Reports: 105874. 10.1016/j.jasrep.2026.105874 (ScienceDirect)

The method under discussion

Ciborowski and Nash (2026) proposed an arithmetic method that uses ratios of selected elements to zirconium, converts differences into percentages, and calculates the geometric mean of those percentages. They presented it as a straightforward way to compare artefacts with potential sources.

Pearce et al. (2026) assessed the application of this method to examples included in the Ciborowski and Nash paper.

Examples examined in the comment

The comment analyses two published datasets.

In the case of Neolithic and Bronze Age obsidian artefacts from Ustica, Pearce et al. report that the arithmetic method produced different source assignments from those reached through bivariate plots of elements such as Rb, Ba, Zr, Nd and U.

In the case of Stonehenge Stone 62 (a non-spotted dolerite), the comment notes that the arithmetic method identified Carn Goedog as a relatively close match. Pearce et al. point out that Carn Goedog is a spotted dolerite and that Stone 62 belongs to a different petrographic group, with differences also visible in compatible elements such as Ni and Cr.

Issues raised by the comment

Pearce et al. raise several points about the arithmetic approach:

• The results can change with small variations in input data, including those caused by rounding or normal analytical precision.
• The use of many rare earth elements can influence the outcome because these elements tend to behave similarly.
• The method as applied in the examples focuses on incompatible elements and does not incorporate compatible elements that may show variation between sources.
• Every element contributes equally to the final geometric mean, without adjustment for differences in analytical precision.
• Petrographic information is not included in the calculation.

The authors of the comment argue that these factors limit the reliability of the method when used on its own.

Alternative approach described

Pearce et al. advocate what they term a “total” approach, combining petrographic examination, mineralogical data, geochemical analysis and geological context.

Summary of the debate

Year	Paper	Main development reported
2020	Nash et al., Science Advances	West Woods suggested as source for most sarsens using pXRF and statistical analysis.
2024–2025	Hancock et al., Archaeometry	Re-examination of data for Stone 58 and discussion of methodological choices.
2025	Harding et al.	Additional stones linked to West Woods area.
Early 2026	Ciborowski & Nash	Arithmetic similarity method proposed.
June 2026	Pearce et al.	Comment examining the arithmetic method and its application to published examples.

Note on the paper

The comment by Pearce et al. (2026) focuses on the application and limitations of one specific arithmetic method. It does not claim to resolve the broader question of sarsen sources at Stonehenge.

References

• Ciborowski, T. J. R., and Nash, D. J. 2026. “Defining Similarity: An Arithmetic Method for Archaeological Source Provenance Targeting Using Geochemical Data.” Journal of Archaeological Science: Reports 69: 105513. 10.1016/j.jasrep.2025.105513
• Hancock, R. G. V., et al. 2024. “Stonehenge Revisited: A Geochemical Approach to Interpreting the Geographical Source of Sarsen Stone #58.” Archaeometry 67(1): 1–19. 10.1111/arcm.12999
• Harding, P., et al. 2024. “Earliest Movement of Sarsen Into the Stonehenge Landscape: New Insights from Geochemical and Visibility Analysis of the Cuckoo Stone and Tor Stone.” Proceedings of the Prehistoric Society 90: 229–251 (published online January 2025). 10.1017/ppr.2024.13
• Nash, D. J., and Ciborowski, T. J. R. 2025. “Comment on: Stonehenge Revisited.” Archaeometry 67: 1423–1436. 10.1111/arcm.13105
• Nash, D. J., et al. 2020. “Origins of the Sarsen Megaliths at Stonehenge.” Science Advances 6(31): eabc0133. 10.1126/sciadv.abc0133
• Pearce, N. J. G., Bevins, R. E., Ixer, R. A., and Pirrie, D. 2026. “Arithmetic Approaches Alone Are Inadequate in Defining Similarity: A Comment on Ciborowski and Nash 2026 ‘Defining Similarity: An Arithmetic Method for Archaeological Source Provenance Targeting Using Geochemical Data’.” Journal of Archaeological Science: Reports: 105874. 10.1016/j.jasrep.2026.105874
• Pearce, N. J. G., Bevins, R. E., and Ixer, R. A. 2022. “Portable XRF Investigation of Stonehenge Bluestone 62 and Potential Source Outcrops in the Mynydd Preseli.” Journal of Archaeological Science: Reports 44: 103525.

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Bulford: Pits, Double Henges and a Claimed Solstice Alignment — Some Sceptical Notes

18 June 2026

News reports this week described two large post pits at Bulford, roughly 120 m apart and aligned on the midsummer sunrise and midwinter sunset around 2950 BC. A finely worked disc-shaped flint knife, placed upright in a smaller pit on the same line, was presented as possible supporting evidence for deliberate solar symbolism.

The discovery has been described as a possible early “prototype” for solar marking in the Stonehenge landscape. Before accepting that interpretation at face value, however, it is worth pausing to consider some basic questions about context, numbers, and coincidence.

The clearest published plan of the surrounding archaeology is Figure 10 below. It shows a noticeable scatter of Late Neolithic pits across the hilltop, with the densest concentration lying southwest of two conjoining segmented ring ditches (the double henges). Some pits occur inside or immediately adjacent to the henges. A smaller, more isolated group appears in the inset.

Figure 10: Woodlands pits at Bulford.

Reproduced from Leivers, M. 2022. The Army Basing Programme, Stonehenge and the Emergence of the Sacred Landscape. Internet Archaeology 56. https://intarch.ac.uk/journal/issue56/2/full-text.html (Figure 10). Used under the journal’s licensing terms.

What the Plan Actually Shows

Dozens of pits are visible on this single plan (easily 30–50+ black dots across the main area and insets). The whole site is not randomly scattered; it occupies a ridge with particular views and topography. The double henges have northern entrances. In such a setting, features aligned roughly on the solstices are more likely to occur than they would on completely flat or randomly oriented ground.

The Structural Reality: Credit to the Excavators

Phil Harding did not simply draw a line across a map and hunt for pits to match it. That is bad archaeology, and Harding is far too experienced for that. What actually happened is much more structurally sound: out of 48 pits excavated across the site, Harding noticed that two were morphologically and functionally exceptional. While 46 were typical shallow scrape-holes, these two measured roughly a metre across and 30 inches deep, with steep sides and environmental traces of ash wood. They were engineered structural postholes dug to support massive timber uprights. Because they are the only two massive structural post pits on the 30-acre site, drawing a line between them isn't arbitrary. Harding identified the structural anomaly first, and then checked the alignment. He noted it sat about 50 degrees off direct north—matching the midsummer sunrise.

The Upright Knife and Structured Deposition

Work on the site has produced several pits with clear structured deposits. At least three contain discoidal flint knives:

• Pit 5008 — discoidal knife in a rich flint assemblage with Grooved Ware and animal bone (~3100–2900 cal BC).
• Pit 8050 — polished discoidal knife with paired antlers, a small spherical chalk ball, Grooved Ware and other finds (~3020–2900 cal BC).
• Pit 8331 — discoidal knife with ball flints, greenstone axe fragment, worked chalk and tools (~3020–2890 cal BC).

These are genuine special deposits. The question is whether the upright “star find” knife highlighted in the news comes from one of these known pits, from another pit in the same cluster, or from a feature more directly associated with the two large post pits. Until the exact context number and its position on a plan like Figure 10 are published, we cannot tell whether the knife strengthens the case for deliberate solar symbolism or simply adds to the general pattern of careful deposition already visible across many pits.

What We Can Reasonably Say

Bulford contains a genuine concentration of Late Neolithic pits with structured deposits, including multiple discoidal knives, set around and near a pair of segmented ring ditches. The 2026 reports add two large post pits and an upright knife on a claimed solstitial line. That combination is interesting and worth serious attention.

However, with dozens of pits visible on the published plan, a general topographic grain that favours certain orientations, and no detailed statistical assessment or precise overlay of the new features yet available, it remains possible that the alignment is at least partly coincidental. Distinguishing deliberate solar marking from the background pattern of pit digging and deposition will require the original context plans, the exact numbers and positions of all features, and a transparent statistical approach.

Figure 10 remains the best publicly available overview of the pit-and-henge complex. It provides the essential framework for asking these questions, even if it cannot yet answer them definitively.

Further detailed plans and analysis from the excavation archive would allow a more robust evaluation. Until then, a degree of scepticism is warranted alongside interest in the new evidence.

Example pit alignment

On the published plan of the Bulford pits (Figure 10), one possible northeast–southwest line can be drawn that passes through several black dots representing pits, including what appears to be one of the larger features. At least three, and possibly more, pits lie on or close to this line, with spacing between some of them roughly consistent with the 120 m distance given in the news reports for the two large post pits. The news coverage states that the line through the two post pits has an azimuth of 48°. This raises the possibility that the two post pits may form part of a longer linear arrangement rather than standing as an isolated pair. This is only one visual example and remains a guess until the exact positions of the reported post pits are plotted on the plan.

---

References

• Greaney, S.E. 2022. The Archaeology of Power: Understanding the Emergence and Development of Neolithic Monument Complexes in Britain and Ireland. Volume 2: Appendices. PhD thesis, Cardiff University / University of Southampton.
• Leivers, M. 2022. The Army Basing Programme, Stonehenge and the Emergence of the Sacred Landscape. Internet Archaeology 56. https://intarch.ac.uk/journal/issue56/2/full-text.html
• Wessex Archaeology grey literature reports (2014–2020) on the Bulford Army Basing Programme excavations (synthesised in the above sources).
• News reports published 18 June 2026 (e.g. The Guardian, BBC) on the Bulford solstice post pits and associated finds.

Prototype Stonehenge Structure at Bulford

Reconstruction of summer solstice celebrations as they might have appeared at Bulford 5000 years ago

 © Wessex Archaeology

Factual Archaeological Report – June 2026

Compiled from Wessex Archaeology announcements and contemporary reporting.

Executive Summary

A Neolithic wooden structure consisting of two large post pits aligned with the solstices was excavated at Bulford, Wiltshire, approximately 5 km (3 miles) from Stonehenge. Radiocarbon dated to around 3000 BC, it is contemporary with the earliest phase of activity at Stonehenge (earthwork construction) but predates the erection of the large sarsen stones by roughly 500 years. The structure was far simpler than later Stonehenge phases and likely served as a basic solar marker or observation point for seasonal/ritual gatherings.

Discovery and Excavation Context

The site was investigated by Wessex Archaeology, led by archaeologist Phil Harding, as part of pre-development archaeological work ahead of new Ministry of Defence housing on Salisbury Plain (Army Basing Programme). Initial evaluation trenching took place around a decade earlier; detailed post-excavation analysis, including alignment studies, has been completed recently.

The find lies outside the Stonehenge World Heritage Site but within the broader Neolithic ritual landscape of Salisbury Plain. The same project area also yielded Late Neolithic pits with special deposits, segmented ring ditches (possible hengiform origins later modified into barrows), an Anglo-Saxon cemetery, and modern military features. The solstice-aligned posts form the focus of recent public announcements.

Description of the Structure

The monument comprised:

• Two large post pits, each approximately 0.5–1 m wide and ~1 m deep, positioned about 120 m apart.
• The pits originally held wooden posts estimated at 2–4 m in height (the timber has long since decayed).
• Alignment confirmed by archaeoastronomer Dr Fabio Silva to match summer solstice sunrise and winter solstice sunset as they appeared around 2950 BC.
• A smaller pit aligned with the two main posts contained a rare disc-shaped (discoidal) flint knife, possibly placed deliberately and symbolically linked to the sun.

The structure was a minimal “gunsight” style marker rather than a complex monument. It would have allowed precise observation of the solstices, consistent with early farming communities’ need to track seasonal cycles.

Artefacts and Ritual Evidence

Dozens of smaller pits surrounded the main posts and contained deliberately deposited items (not domestic refuse). Key finds include:

• Grooved Ware pottery in the Woodlands style (distinct from Durrington Walls style found nearby).
• Finely worked flint tools, notably a rare discoidal flint knife with high craftsmanship.
• Animal bones (cattle, pig, red and roe deer, aurochs), antler digging tools.
• Chalk objects: a small spherical “ball” and a large concave “bowl”, both showing carving marks.
• Evidence of careful, sequential refilling of pits suggests ritual or symbolic deposition rather than waste disposal.

Dating and Chronological Context

Radiocarbon dating of organic material (bone, antler) from associated pits places the main activity at approximately 3000–2900 BC. This aligns with Stonehenge Phase 1 (construction of the earthwork enclosure and ditch) but is roughly 500 years earlier than the placement of the large sarsen stones.

Feature / Phase	Approximate Date	Relation to Stonehenge
Bulford post pits & associated activity	~3000–2900 BC	Contemporary with Stonehenge Phase 1 (earthworks)
Stonehenge sarsen stones & trilithons	~2500 BC	Approximately 500 years later
Local ring ditches (Bulford)	Late Neolithic origins; Early Bronze Age modification	Part of the wider evolving ritual landscape

Interpretation

Phil Harding described the discovery as one of the greatest finds of his career, noting that even two post pits reveal much about the thinking, behaviour, and cosmology of people 5,000 years ago. Matt Leivers (Wessex Archaeology) highlighted the long-term continuity of marking significant celestial events in the landscape, describing it as evidence of “the religion of the stone age made manifest in the ground.”

The structure indicates early and accurate interest in solar alignments, almost certainly linked to seasonal concerns of early farming communities. Winter solstice marking may have been particularly important as a ritual response to the “dying” of the light and the hoped-for return of spring. It is plausible (though not proven) that some of the people using the Bulford site were involved in the earliest construction phases at Stonehenge itself.

The find does not overturn existing models of Stonehenge’s development but adds important detail to the pre-stone phases and demonstrates that solstice awareness in the region began earlier and in simpler forms than the iconic monument we see today.

Broader Implications

This discovery reinforces the picture of a rich, evolving Neolithic ritual landscape across Salisbury Plain, with multiple foci of activity. It underscores the value of systematic developer-funded archaeology in revealing sites that would otherwise remain unknown. The preservation of the nearby ring ditches as a Scheduled Ancient Monument is welcome.

Further detailed publication of the full post-excavation analysis by Wessex Archaeology is expected and will provide additional stratigraphic, artefactual, and environmental data.

Further Reading & References

Primary news reports (June 2026)

• The Guardian – “Solstice-aligned 5,000-year-old monument ‘once in a lifetime find’, say archaeologists” (detailed quotes from Phil Harding and Matt Leivers).
• BBC News – “Simpler, older version of Stonehenge found three miles from famous site” (excellent explanation of the alignment work by Dr Fabio Silva).
• Associated Press – Straightforward factual report on the discovery.

Official project sources

• Wessex Archaeology – Discovery led by Phil Harding reveals 5,000-year-old ‘prototype’ for Stonehenge solar alignment.
• Wessex Archaeology – Bulford project page (background on the wider excavations, Neolithic pits, ring ditches, and earlier phases of the same Army Basing Programme work).
• Wessex Archaeology – Army Basing Programme overview (context for the Larkhill and Bulford discoveries).

Additional context

• Phil Harding has worked extensively on the Stonehenge landscape and previous Bulford excavations (2015–2017 phases). Full post-excavation reports from the current work are expected in Wessex Archaeology’s grey literature series and will eventually be available via the Archaeological Data Service (ADS).
• For broader Neolithic landscape studies around Stonehenge and the River Avon, see earlier publications arising from the same Army Basing Programme (e.g. work at Larkhill).

Woodhenge: slightly solstitial?

 

How much sun is actually built into Woodhenge? The short answer is: a real orientation, an unreliable line, and a very short working life. The longer answer is more interesting, and rather less than the signage promises.

The claim, and its pedigree

The standard story is easy to tell. Woodhenge is a Late Neolithic timber monument two miles north-east of Stonehenge: six concentric oval rings of posts (Maud Cunnington's rings A–F), later wrapped in a bank-and-ditch henge with a single causewayed entrance. The long axis of those ovals runs broadly north-east to south-west — the same axis as Stonehenge — and is said to point at the midsummer sunrise in one direction and the midwinter sunset in the other. Hence the tidy textbook line, repeated on the English Heritage signboards, that the monument was “built to align with the summer solstice sunrise.”

The pedigree is respectable. Cunnington herself drew the comparison with Stonehenge in her 1929 excavation report, and noticed that a clear sightline ran between the posts in the solstitial direction. Alexander Thom surveyed the site in the late 1950s and reached broadly the same conclusion. And the most authoritative modern treatment — Clive Ruggles and Amanda Chadburn's Stonehenge: Sighting the Sun (Historic England / Liverpool University Press, 2024) — accepts a deliberate solstitial orientation of the timber rings as part of a genuine mid-third-millennium practice across the Stonehenge landscape.

So this is not a fringe claim to be knocked down. It is a mainstream one, endorsed by the people who have spent their careers being sceptical about exactly this sort of thing. Which makes it worth asking, precisely, what survives once the scepticism is applied evenly — including to Woodhenge.

What “aligned” is allowed to mean

Ruggles and Chadburn draw a distinction that does most of the useful work here. They separate three grades of solar orientation: monuments that are broadly solstitial (precision of the order of 5°, e.g. Maes Howe); monuments that pinpoint the solstice in space (around 0.5°, as the Stonehenge axis does); and monuments that could in principle pinpoint the solstice in time (of the order of 0.01° — the kind of precision Thom once imagined at Kintraw, and which has not survived scrutiny).

The crucial point is that even Stonehenge, the precise end of the credible range, fixes the solstice in space but not in time. For several days either side of the actual solstice the sun rises and sets in sensibly the same place on the horizon, so an alignment of this precision tells you where on the skyline to look, but cannot tell you which day is the solstice. Stonehenge could flag a window of days for ceremony; it could not function as a calendrical instrument. That is the ceiling. Any claim that Woodhenge did better than Stonehenge would need extraordinary evidence, and there is none.

The line that will not stay still

Here is the first genuinely sceptical difficulty, and it is one Cunnington flagged herself: an oval has a long axis, but Woodhenge's posts are irregularly spaced, and the exact azimuth of the axis is correspondingly hard to fix. This is not a quibble. The whole claim rests on a single line drawn through a slightly lopsided arrangement of postholes, and where you put that line depends on choices.

It depends, first, on which rings you trust. Cunnington noticed that rings A and B appeared to share an entrance orientation closer to that of the henge than to the inner rings. Chadburn (2010) and Chadburn and Ruggles (2017) accordingly suggested that perhaps only part of the monument — plausibly rings C, D, E and F — followed the “astronomical” axis at all. The monument may not be a single aligned object so much as an aligned core inside a less-aligned shell.

It depends, second, on whose survey you use. Cunnington and Thom arrived at slightly different azimuths (Ruggles 2006 discusses the discrepancy), and Thom's figure has the additional weakness that he was surveying the modern concrete marker posts, set in the 1920s to indicate the holes, rather than the excavated holes themselves. A survey of markers is a survey of an interpretation. None of this is fatal, but it means the “alignment” comes with error bars wide enough to matter, and that the often-quoted single azimuth is more confident than the underlying geometry warrants.

The entrance, and the awkward dates

If Woodhenge were straightforwardly a solar monument, you would expect its most prominent architectural feature — the henge entrance — to honour the same axis. It does not. The bank-and-ditch entrance sits on a noticeably different alignment from the timber rings, and that mismatch is the loose thread that the recent dating programme has pulled.

Funded by Historic England for Sighting the Sun, and reported in detail by Chadburn and Marshall (Historic England Research Report 94/2024), radiocarbon dating and Bayesian modelling of Cunnington's curated charcoal and of antler picks from the 1970 ditch section produced two distinct events. The timber rings were raised in roughly 2635–2575 cal BC (95% probability) — close in time to the sarsen settings at Stonehenge. The enclosing ditch and bank came significantly later, most probably in the range 2465–2345 cal BC: on the order of two centuries afterwards. (This supersedes the older single-phase reading of about 2300 BC derived from the 1970 Evans and Wainwright trench.)

That gap reframes the entrance problem rather neatly. The henge builders, two centuries on, did not align their entrance on the sun because by then there was probably nothing solar left to align with: the timber rings, the actual carriers of the orientation, would have rotted or been removed. The solstitial sightline, in other words, appears to have been a feature of the early timber monument and to have lapsed long before the earthwork that now defines the site to visitors.

A short working life

This is the conclusion Ruggles and Chadburn themselves emphasise, and it deserves more prominence than it usually gets. The solstitial alignments at both Woodhenge and the Durrington Walls Southern Circle appear to have been short-lived: at Woodhenge the timbers decayed; at Durrington the circle was buried inside a vast henge. Within perhaps a century of construction, the sightlines at both had ceased to be usable for actual observation (Ruggles & Chadburn 2024, 109–111; Chadburn & Marshall, forthcoming).

A monument that can be observed along for a century or so is a real thing, but it is not the timeless solar observatory of popular imagination. It also sits awkwardly with the more romantic processional narratives — crowds walking between aligned monuments at the turning points of the year — if the alignments at the different sites were not all operational at the same time. That is precisely the open question the authors flag rather than answer.

The landscape did some of the aligning

The deepest sceptical point is one the leading researchers raise against themselves. How much of the “alignment” is astronomy, and how much is geography that happened to run the right way?

It has been argued for Stonehenge that the site was chosen partly because natural periglacial striations in the chalk already ran in an approximately solstitial direction (Parker Pearson 2012). The Durrington Southern Circle and the Lark Hill posthole alignment both face down dry valleys that lead off in broadly solstitial directions. If a builder erects a monument facing down a valley whose natural axis is already near the solstice, the resulting “alignment” is real but partly inherited from the ground, not computed from the sky. The intention may have been to monumentalise a place already felt to be charged, with the solar coincidence read as confirmation rather than designed from scratch. Woodhenge, on its low rise above the Avon, is at least a candidate for the same reading. Distinguishing deliberate astronomical design from appropriated topography is genuinely hard, and the honest position is that we have not done it.

It is worth remembering, too, that broadly sun-facing orientation is common in the period without implying precision: the long barrows of a millennium earlier tend to face the sunrise/sun-climbing sectors of the horizon, but under the influence of several factors at once, and well-known solstitial monuments such as Newgrange look like one-offs within multifactorial orientation patterns rather than members of a precise tradition. A north-easterly facing in this landscape is not, by itself, strong evidence of solar intent.

Why the modest version is the credible one

There is a useful discipline that cultural astronomers have enforced since the early 1980s, summarised by the statistician Peter Freeman as “observe everything” and “report all you observe.” The failure mode it guards against is selecting the one feature that fits your hypothesis and quietly ignoring the rest. Ruggles and Chadburn deploy exactly this principle to dismantle a series of recent overreaches: Darvill's reading of a 365¼-day calendar in the numerology of the stones; the 2km “mega-circle” of pits around Durrington Walls, much of which turns out to be natural sinkholes and Bronze Age features; and the two Cursus pits said to mark solstice sunrise and sunset from the Heel Stone, which are merely two among several.

The reason the Woodhenge orientation survives the same treatment is that it is a modest claim. It does not require precision Stonehenge itself lacks, it does not require a calendar, and it does not require selecting one feature from many: the long axis of the rings is the obvious feature, and it does point, broadly, the right way. Strip out the embellishments and what is left is defensible: a deliberate, broadly solstitial orientation of the early timber rings, of modest precision, in a landscape where that practice was briefly current.

What the signage overstates

Set against the literature, the public framing — “built to align with the summer solstice sunrise” — is not wrong so much as over-confident in three specific ways. It implies a single, well-determined azimuth, where the axis is in fact contested and hard to fix. It implies the whole monument is the aligned object, where the dating suggests the alignment belonged to the early timber rings and not to the henge that visitors actually see. And it implies a standing, enduring relationship with the sun, where the working life of the sightline was probably brief. The midwinter-sunset half of the claim is weaker still at the site, since the south-western horizon rises and blocks the setting sun, which is part of why the north-eastern, sunrise direction is the one usually emphasised.

A reasonably sceptical verdict

The defensible position, on the best current evidence, is narrow but real:

• The early timber rings were probably deliberately oriented on the solstitial axis, in step with a genuine practice seen at Stonehenge, Durrington and Lark Hill around 2600–2500 BC.
• The orientation is broadly to moderately precise at best; the exact azimuth is not securely known and the two historic surveys disagree.
• The alignment was short-lived and had probably lapsed by the time the henge earthwork — whose entrance ignores the solar axis — was built two centuries later.
• How much of the orientation reflects astronomy and how much an already-solstitial patch of landscape remains genuinely unresolved.

What does not survive is the observatory: there is no evidence Woodhenge measured the solstice, predicted it, or kept a calendar, and good reason to think it could not have. The fair summary is that Woodhenge was a monument oriented on the solstice, for a while, not a monument that observed it. That is a smaller and more interesting claim than the boards suggest — and, conveniently, the one the strongest research actually supports.

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Sources

Cunnington, M. E. 1929. Woodhenge: A Description of the Site as Revealed by Excavations. Devizes.
Ruggles, C. L. N. 2006. “Interpreting Solstitial Alignments in Late Neolithic Wessex.” Archaeoastronomy: The Journal of Astronomy in Culture 20: 1–27.
Chadburn, A. and C. L. N. Ruggles. 2017. “Stonehenge World Heritage Property, United Kingdom.” In Heritage Sites of Astronomy and Archaeoastronomy in the Context of the UNESCO World Heritage Convention: Thematic Study no. 2. Paris: ICOMOS, 41–62.
Ruggles, C. L. N. and A. Chadburn. 2024. Stonehenge: Sighting the Sun. Liverpool University Press / Historic England.
Ruggles, C. and A. Chadburn. 2024. “Missing data.” Cosmovisiones / Cosmovisões 5 (1): 99–109. DOI: 10.24215/26840162e007 (open access).
Chadburn, A. and P. Marshall. n.d. Woodhenge, Durrington, Wiltshire: Radiocarbon Dating and Chronological Modelling. Historic England Research Report Series 94/2024.
Ruggles, C., A. Chadburn, M. Leivers and A. Smith. 2021. “A Possible New Sightline in the Stonehenge Landscape.” Journal of Skyscape Archaeology 7 (1): 144–156.
Parker Pearson, M. 2012. Stonehenge: Exploring the Greatest Stone Age Mystery. London: Simon & Schuster.
Magli, G. and J. Belmonte. 2023. “Archaeoastronomy and the alleged ‘Stonehenge calendar’.” Antiquity 97 (393): 745–751.