I've just watched your You Tube video all the way through - didn't want to watch it until I had time to see it all. A wonderful, other worldly landscape which immediately made me think of the sarsen drift valley near Avebury, although the stones very much smaller. I understand Comeragh is glaciated as well.

I agree many of the stone piles look deliberate (especially the mound around seven minutes into the video) and could well be burials. The people burying their dead would not have had to dig too deep as ample supply of stones to pile on a shallow grave. The other possible explanation may be that the stones were harvested for walls, houses (whatever) and certain stones discarded into piles as not suitable - just a thought.

Interesting - thank you (even though you were a little prickly at times). I wish you well in pursuing some formal excavations in the not too distant future.