The origin of Stonehenge's enigmatic Altar Stone remains a puzzle, as a recent comprehensive geological study has overturned a prevailing theory that it came from northeast Scotland. This latest research, described as the most thorough investigation of the Altar Stone ever conducted, has provided new insights but has not yet pinpointed its source.
Professor Tim Pirrie, who led the new publication, stated that his work has "built the clearest picture yet" regarding the stone. The study's findings are significant because "ruling out potential source areas is just as important as identifying new ones," according to Professor Nick Pearce, a geochemistry expert involved in previous research. He added that each eliminated location brings scientists closer to discovering the stone's true origin.
The Altar Stone is unique among the monoliths at Stonehenge, and tracing its source is crucial for understanding its journey to Salisbury Plain thousands of years ago. The world-famous monument was constructed in several phases between 3000 and 1600 BC. While most of Stonehenge's large sarsen stones are local, its smaller bluestones were transported approximately 225 kilometers from west Wales, with evidence suggesting some may have come directly from another stone circle.
The effort to identify the Altar Stone's provenance is part of a larger ongoing scientific endeavor. Previous research has focused on various geological regions, but the new study has specifically challenged the northeast Scotland theory. The precise sourcing of the stones used in Stonehenge is key to understanding the monumental effort and complex social structures of the people who built it.