From Pastscape :
NY33SW 1 at NY34253364 is an (?IA) univallate hillfort of 1.9 hectares. It goes around two summits, lending it a cardioid shape. This fort was either never finished or was 'slighted'. eithin its interior are two (?BA) cairns NY33SW 5 at NY34333363 . Both of these have been damaged by walkers by use as shelters, and the eastern one has probably been damaged [my thought is all three items are co-eval, with the cairns as maybe hut-circles or BA houses].