It’s a pretty major achievement to discover the location of the millennia-old quarry down to a few metres, but this also throws up some new mysteries. The rhyolitic rocks differ from all others in South Wales. The presumption is that they were chosen for a specific reason. How were they identified and why? There has been some interesting work done elsewhere into the acoustic qualities of particular stones at prehistoric sites. Is this important?
And this discovery has also kicked a hole in theories of how the stones were transplanted to Salisbury Plain. A consensus was growing that they were floated on rafts along the coast, but the exact location’s inaccessibility to water makes this unlikely. The old geologic theory – that the stones were pushed by advancing glaciers from Wales to Wiltshire during the ice age – is pretty flimsy as there aren’t any other Welsh rocks scattered around the Plain.