On a misty day, myself and LM ventured up Tallaght Hill to Ballymana and this anomalous site. Said by some to be a stone circle, there is indeed a circle of stones, but they surround a messy oval mound that's covered in gorse and hard to make out. A fine misty rain was falling and visibility was poor and we were unable to stick around.
The stones that surround the 'cairn' are varied in size, shape and type. I tried in vain to take a shot that shows them all. The 'cairn' itself is all rubble and vegetation and could be modern field clearance, though why so as this is sheep-farming land and not quality pasture, with many boggy, turlough-type ponds. I reckon that this site bears further exploration, maybe soon and quite likely as it's only up the road.