A new mystery about Stonehenge has been solved. Geologists have proven that the 6.6-ton altar stone was transported 700 km from Scotland by humans, not glaciers.
Researchers traced the stone's origin to the Orcadian Basin in Scotland. Modeling showed that glaciers could not have carried the stone to southern England.
Experts explain: "The altar stone is unique, made of a different rock, and located near the center. Analysis pinpointed its source."
Ice sheets could have moved it to the Dogger Bank, but then humans had to complete the journey. This discovery raises new questions about Stonehenge's construction.
