Mike Pitts mentions the following in his ‘Hengeworld’ book:
In 1769, John Mayo (local vicar) wrote a letter to the Society of Antiquaries in London. A farmer had levelled part of the bank surrounding Marden the previous year and had found a human skeleton, which Mayo reckoned to have been a person “about 6ft 2 or 3 inches high.”
Interestingly, he also noted that “a great many Staggs Horns were digged up.” – of course, antlers have been found at many other neolithic sites (Avebury for example), having been used to dig out the giant ditches.