Scottish Highlands Theory Ruled Out in Stonehenge Altar Stone Hunt

WHO:

The Guardian - Nick Pearce, an emeritus professor of geochemistry in the Department of Geography and Earth Sciences at Aberystwyth University, described the search as “a needle in a haystack.”

The Guardian - Duncan Pirrie, an emeritus professor at the University of South Wales, led the study and said the altar stone’s origin remained an “enigma.”

The Guardian - Mike Pitts, a Stonehenge expert not involved in the study, said identifying the stone’s origin would help show how it fit into the world of the people who moved it.

The Guardian - Specialists from universities in London, Wales and Australia proposed a north-east Scotland origin for the stone; further researchers involved in the investigation came from Canada, Italy, Sweden and Scotland.

Phys.org - Scientists ruled out several previously proposed locations and continued searching for the source of Stonehenge’s Altar Stone.

WHAT:

The Guardian - Researchers concluded it was “very unlikely” the altar stone originated in north-east Scotland. Pirrie said it definitely did not come from southern Britain.

The Guardian - The stone may have originated elsewhere in Scotland, northern England or Ireland. The investigation has not identified a confirmed source.

The Guardian - Researchers took about 70 samples from north-east Scotland and tested them in laboratories.

The Guardian - Eight altar-stone fragments held in museums were examined as part of the investigation.

The Guardian - The altar stone weighs six tonnes.

The Guardian - Pirrie called the work “the most comprehensive geological investigation of the altar stone ever undertaken” and said no examined location matched the stone’s set of characteristics.

Phys.org - The search entered a new phase after scientists ruled out several proposed locations and moved closer to identifying the stone’s origin.

WHERE:

The Guardian - Researchers searched for matching geological outcrops in north-east Scotland, an area described by Pearce as thousands of square kilometres.

The Guardian - Stonehenge is in southern Britain; the altar stone’s possible source regions include Scotland, northern England and Ireland.

WHEN:

The Guardian - The article says the north-east Scotland origin hypothesis was proposed in 2024.

WHY:

The Guardian - Researchers sought to identify where the altar stone originated; Pearce said eliminating potential source areas narrows the search.

The Guardian - Pitts said finding the origin would help place the altar stone in the world of the people who transported it and reveal where its journey began.

HOW:

The Guardian - Researchers profiled the slab’s precise composition, examined it in place using non-invasive techniques, studied eight museum-held fragments and compared the results with Scottish outcrops.

The Guardian - The research combined a range of analytical techniques to test leading theories about the stone’s origin.

The Guardian - Pearce said storms affected fieldwork conditions during a colleague’s visit to Scotland.

(UPDATED November 5, 2026 19:15 UTC)

Scientists ruled out northeast Scotland as the source of Stonehenge’s six-tonne Altar Stone. Its origin remains unknown, with Scotland, northern England and Ireland still possible. Researchers compared stone samples and museum fragments, narrowing the search for its beginnings.