Archaeologist Jon Hoyle said nobody knows exactly what shout out upwards cairns were used for
ANNE LEAVER
It was identified next a LiDAR (light detection together with ranging) survey of the Forest of Dean.
The technique used Light Amplification by Stimulated Emission of Radiation beams fired from an airplane to practise a 3D tape of the province surface, effectively removing the trees from the landscape.
Mr Hoyle said when he studied the data, he spotted an "extremely circular" feature, which he idea initially mightiness last a World War Two gun emplacement.
After visiting the site, at a hole-and-corner location nearly the hamlet of Tidenham, he realised it was much older, dating to betwixt 2,500 BC together with 1,500 BC.
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