[1] Like other 'superhenge' sites such as Durrington Walls much of the earthworks have been ploughed or weathered away and it was not rediscovered until Stuart Piggott visited the area in 1936.

Excavation in the 1960s revealed little material in the henge ditch though some fragments of grooved ware and children's skeletons were found.

Consisting of large oak timbers placed at 20 in (51 cm) intervals it would have served as a huge barrier to the middle of the site.

The excavator, Geoffrey Wainwright, estimated that 1600 timbers had stood in the trench, enclosing an area of 12 acres (4.9 ha).

A study of the 'mega henge' has concluded that its construction was under way in around 2,500 BC, and it was built in between 35 and 125 years, not over centuries as had previously been thought.