I know some people long ago used to stick dead people under piles of stones. But for what other reasons have cairns been built? Landmarks to find your way in the snow? Something for sheep to cuddle up to? Arty boredom of shepherds?
Sorry. I'm not in touch with my mountainous roots to my eternal shame. I was just wondering how you can ever date such things and whether their purpose could show up in the design. Anyone got enough patience for a Cairns 101?
Also, isn't it possible or likely that cairns get robbed for walls then built up again from the fallen down walls that robbed from them etc according to local whim or to further the (to me, mysterious) purposes wot cairns have.