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Stonehenge's Altar Stone came from northern Scotland

Status: Mainstream Verdict: Measured: from at least 750 km away

The claim: The six-tonne Altar Stone at the centre of Stonehenge came from the Orcadian Basin in north-east Scotland, at least 750 km away.

Why this label: Published in Nature in August 2024. Ages and chemistry of mineral grains inside the stone match the Old Red Sandstone of the Orcadian Basin and not the Welsh sources previously assumed. A textbook 'fact' overturned by new measurement.

Background

The finding implies Neolithic Britons moved a six-tonne shaped block the length of Britain, probably by sea. Stonehenge's own timeline is also longer than often assumed: large Mesolithic posts stood nearby about 8500–7650 BCE, the first henge was built about 3000 BCE, and the sarsens were raised about 2500 BCE.

What has been measured

Dates, measurements and documented findings, kept separate from interpretation.

Evidence and arguments for

  • Grain-age fingerprints are a well-tested provenance method; later work discusses the significance of distant sources. [1][2]

Evidence and arguments against, or limits

  • The exact outcrop within the Orcadian Basin is not yet identified, and the transport route is inferred. [1]

Open questions & what would change the label

Pinpointing the source outcrop and finding evidence of the route.

Sites

Stonehenge

Sources

  1. Clarke, A. J. I. et al. (2024). A Scottish provenance for the Altar Stone of Stonehenge. Nature 632. doi:10.1038/s41586-024-07652-1 data
  2. Parker Pearson, M. et al. (2025). Stonehenge and its Altar Stone: the significance of distant stone sources. Archaeology International 27. doi:10.14324/ai.27.1.13 background
  3. English Heritage: A timeline of Stonehenge. https://www.english-heritage.org.uk/visit/places/stonehenge/history-a… background
  4. Historic England Heritage Gateway: possible Mesolithic pits/post-holes, Stonehenge old car park. https://historicengland.org.uk/listing/heritage-gateway/results/recor… data

More in this section: Megalithic construction.

Sources checked against Crossref and publisher pages on 2026-10-22. Labels describe the claim, not the people who hold it. Methodology.