Humans took boulders from Wales to Stonehenge, study finds
The bluestones are believed to have been among the first erected at the Wiltshire site about 5,000 years ago.The team's work focused on the so-called Newall Boulder, a 22x15x10cm rock excavated at Stonehenge in 1924 orginally from Craig Rhos-y-Felin in Pembrokeshire.Building on previous work, the researchers presented new data which shows the boulder, now in the collection of the Salisbury Museum, In an article published in the Journal for Archaeological Research, Professor Richard Bevins concludes there is "no evidence for ice extending as far south as Salisbury Plain", where the monument is located."New evidence allows us to reiterate our earlier interpretation that the boulder is not a glacial erratic but rather is derived from a fragmented monolith at Stonehenge [...] transported from Craig Rhos-y-Felin to Stonehenge by Neolithic people," the article saysThe team's work challenged a competing theory that the boulder was reduced in size and heavily modified during glacial transport, and was eventually dumped at or relatively close to the Salisbury Plain.
The theory that the boulder's shape was changed by ice is supported by five arguments related to its shape, including its crude bullet shape top.But Professor Bevin and his team most of the characteristics cited "could be simply generated by surface weathering".If the bluestones were transported by ice part even of the way from their source in west Wales towards Stonehenge, there should be erratics - rocks that have been transported by glaciers - from the Preseli Mountains in west and south Wales, they said.And while there are erratics in some areas, "there is no record of the very distinctive spotted dolerite used at Stonehenge", the researchers said.They added that the "total absence" of spotted dolorite - the distinctive rock known as bluestone - further east than the Narberth area in Pembrokeshire, and the evidence for Neolithic stone extraction at both Craig Rhos-y-Felin argue "strongly in favour of human transport".
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