Researchers studying Stonehenge’s central Altar Stone said a glacier-only explanation is unlikely for how the six-tonne sandstone megalith reached Salisbury Plain from north-east Scotland, about 700 kilometres (435 miles) away. The study, published on June 4, used mineral grain dating and ice-sheet modeling to test whether Ice Age glaciers could have moved the stone south. The researchers said glaciers may have carried the rock part of the way, possibly to Doggerland or Dogger Bank in the Nor...

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