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Much of the archaeology in recent years has been based upon the assumption that Neolithic Age man had a reason for transporting bluestones all the way from west Wales to Stonehenge and the technical capacity to do it.
Richard Bevins said: "This recent discovery is very significant as it potentially provides us with new clues for understanding how and possibly why the Welsh bluestones were transported to the Stonehenge area.
Through standard petrographical techniques combined with sophisticated chemical analysis of samples from Stonehenge and north Pembrokeshire using laser ablation induction coupled mass spectrometry at Aberystwyth University, they have matched one particular rhyolite to an area north of the Mynydd Preseli range, in the vicinity of Pont Saeson.
The Bluestones are a distinctive set of stones that form the inner circle and inner horseshoe of Stonehenge.
If humans were responsible then an alternative route might need to be considered.
It seems convincingly too narrow for log rollers and leads me to think sleds/skids may be the answer...
One of the samples is from Craig Rhos-y-felin, which has recently been identified on petrological and geochemical grounds as the source of much of the debitage (struck flakes) at Stonehenge.
Analysis of a Stonehenge rhyolite fragment yields an age comparable with that of the Craig Rhos-y-felin sample.
It is thought that stones were transported from here down the adjacent river bed.
Professor Mike Parker-Pearson pointing to the exact spot where one of the rhyolite bluestones was removed which is now in stonehenge.