article_snippet.sent: Some rocks were originally stuck together with a form of ancient glue and have been carbon dated to be around 7,000 BC.
article_snippet.sent: Some rocks were originally stuck together with a form of ancient glue and have been carbon dated to be around 7,000 BC.
article_snippet.sent: Experts dated rock between nine and 13 ft (three and four metres) below the surface as 6,500 years old and 12,500 years old below the surface.
article_snippet.sent: They date to 7,000 BC BC .
highlights_snippet.sent: Tests have established parts of the structure date to 7,000 BC .
  