CPAT - the Clwyd / Powys Archaeological Trust - have the following to say about this fallen monolith... lying up here in about as wonderfully obscure and vibey position as I can imagine:
'... A recumbent stone located 51m south-south-west of PRN 3001 [that is the south western cairn - Gladman].... rectangular in section 3.5m in length (east to west) 0.94m in width (north-west to south-east) and 0.63m in height. Basal hollow at east end, 1.2m across, containing a number of packing stones, many are now overgrown with heather. The stones has fallen to the west and there is some erosion, due to stock shelter, at the west end. Very exposed site with commanding views all around. Good palaeoenvironmental environment to the south, downslope. (CPAT 2005)'