Remains of what appear to be a chamber.... Henshall mentions a ‘depression’ near the centre in 1963 (presumably the 1959 visit) confirmed by the OS in 1978, so assume this was not visible back then?
Not the best image of a quite substantial, grassy long cairn set in a wonderfully secluded forestry clearing..... however, in mitigation, the camera time stamp does say 21:26. Fading light at the end of a long day.