of Stonehenge
Culture24 [UK], 22 February 2011
The ongoing debate surrounding the source of the famous bluestones
formimg the distinctive inner circle and horseshoe of Stonehenge has
taken another turn after new findings emerged from Amgueddfa Cymru –
National Museum Wales. One type of bluestone, the so-called spotted
dolerite, was convincingly traced to the Mynydd Preseli area of North
Pembrokeshire in the 1920s, but the origins of many of the others have
remained a mystery. Now geologists at the museum in Cardiff believe they
have identified the source of one of the rhyolite types. A team led by
Keeper of Geology Dr Richard Bevins has been using "standard
petrographical techniques" and "laser ablation induction coupled mass
spectrometry" on samples from Stonehenge and Pembrokeshire. Their
findings, which involve the application of zircon chemistry as a new
tool for "provenancing rhyolitic lithics", point to a source for the
stones in an area north of the Mynydd Preseli range, in the vicinity of
Pont Saeson.
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