Rockhopper,
This is probably a silly question, have you looked at the old OS maps on OSI for the area? Just to get an idea of what population / buildings there may have been pre-famine?
http://maps.osi.ie/publicviewer/#V1,591271,743300,0,10
If you click into this and then the historic 6" you will find the maps for the area.
Just an idea and ive found everything mentioned interesting but again im not really qualified to comment on the shapes etc of the rock-piles.
I did find it amazing what the pre-famine settlement patterns were like in ireland, I wonder whether there may have been some more settlement up around this area at that time than now? Again just something to rule out.
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