From the Gizmodo link:
Geologists Robert Ixer of the University of Leicester and Richard Bevins of the National Museum of Wales spent nine months using petrography (the study of mineral content and textural relationships within rocks) and managed to trace one of the original stones back to a rocky outcropping near Pembrokeshire, Wales called Craig Rhos-y-Felin. [160 miles from the Stonehenge site].
From the Independent link:
The discovery has re-invigorated one of academia's longest running debates - whether the smaller standing stones of Stonehenge were quarried and brought all the way there from Pembrokeshire by prehistoric humans or whether they had already been plucked out of ancient rock outcrops and carried all or part of the way to Wiltshire by glaciers hundreds of thousands of years earlier.
Archaeologists tend to subscribe to the 'human transport' theory, while some geomorphologists favour the glacial one. The debate is solely about Stonehenge's early/smaller standing stones (often known collectively as 'bluestones') - not about the larger ones (most of the so-called 'sarsens') which were incorporated into the monument several centuries later.
From Wired:
The more well-known and iconic stones, the huge sarsens, were incorporated into the monument several centuries later. They came from somewhere in the Marlborough Downs, 20 miles north of Stonehenge.
Sources -> http://gizmodo.com/5877177/origins-of-stonehenges-stones-found-and-holy-crap-did-they-travel-far
http://www.wired.com/wiredscience/2011/12/stone-henge-rocks-origins
http://www.independent.co.uk/news/science/archaeology/news/scientists-discover-source-of-rock-used-in-stonehenges-first-circle-6278894.html
Earlier Stonehenge link -> http://www.dannyfinnegan.com/2011/11/newly-discovered-pits-add-mystery-to.html
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