The barrow is considered to be of the Severn-Cotswold tomb type. These generally consist of long, precisely built trapezoidal earth mounds covering burial chambers. Because of this they are a type of chambered long barrow. The chamber, made of sarsen stones, contained partial human skeletons. An arrowhead was also recovered. There is a breast shaped hill in the spot with the remains of the barrow being 70 metres (230 ft) long and around 7 metres (23 ft) high with ditches on either side. It was partially excavated by John Thurnam in 1860. The area around Adam's Grave has a high density of long barrows and is important because of its archaeological potential.
The arrangement of stones around the site suggests there was once a kerb or forecourt. They are known as ‘Old Adam and ‘Little Eve’ and are near the original entrance to the barrow. According to folklore the barrow is the grave of a giant and his ghost has been reported. Associations with Avebury have also been suggested.
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