Given the islands famous lack of wood, do you know that these stones are prehistoric?
We do have similar prehistoric boundary markers on the North York Moors, this being the best example http://www.themodernantiquarian.com/site/5506 with the stone row predating the dyke that was thrown up around them.
Many examples of prehistoric field walls seem to be composed of low banks of rubble such as the Dartmoor reaves or this example from my patch http://www.themodernantiquarian.com/post/28061
This does not mean to say that the ancient Orcadians didn't indulge in dry stone walling, especially given their superior stone working abilities and the availability of suitable stone.
I guess that's one you need to discuss with the archaeos.
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