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Another type of bluestone, the so-called spotted dolerite, was convincingly traced to the Mynydd Preseli area in north Pembrokeshire in the early 1920s However, the sources of the other bluestones - chiefly rhyolites (a type of rock) and the rare sandstones remained, until recently, unknown.
Now geologists at Amgueddfa Cymru National Museum Wales have further identified the sources of one of the rhyolite types, which also provides the opportunity for new thoughts on how the stones might have been transported to the Stonehenge area.
If humans were responsible then an alternative route might need to be considered.
However, some believe that the stones were transported by the actions of glacier sheets during the last glaciation and so the Pont Season discovery will need appraising in the context of this hypothesis.
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.
The shrub-covered bluestone crag at Craig Rhosyfelin.
Using the ridgeway tracks across Wales, moving the semi-dressed stones would be arduous but not impossible.
The Carn Meini outcrop is to the left of this shot - which is basically looking along the northern flank of the Preseli Hills towa... Location - SN11673616, at Rhos-y-felin between Brynberian and Crosswel, near Crymych in Pembrokeshire.Their findings are published in the March 2011 edition of the Journal of Archaeological Science.Dr Richard Bevins, Keeper of Geology at Amgueddfa Cymru, in partnership with Dr Rob Ixer, University of Leicester and Dr Nick Pearce of Aberystwyth University, have been working on the rhyolite component of the bluestones, which leads them to believe it is of Welsh origin.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.
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.