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The stones have been matched to specific rock outcrops in the Preseli Hills
Geologists traced several bluestones to named outcrops, including Craig Rhos-y-felin and Carn Goedog.
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How did the bluestones of Stonehenge travel from Wales?
Stonehenge
The smaller stones of Stonehenge come from the Preseli Hills in west Wales, about 240 kilometres away. Were they carried by people or left nearby by glaciers?
People transported them
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Archaeologists report traces of Neolithic quarrying at those outcrops
Stone tools, platforms and dated remains at the outcrops are interpreted as evidence that pillars were extracted there by people.
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Rebuts the entry above
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Some geologists read the same features as natural
Critics argue that the supposed quarry features can be produced by natural weathering and rockfall.
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Glaciers carried them most of the way
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No trail of similar glacial boulders has been found on Salisbury Plain
If ice had carried the stones close to the site, other boulders of the same rock would be expected in the surrounding area.
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