I'm not convinced that the stone fences ones I've seen in Snowdonia are prehistoric. They aren't weathered enough. Also, they don't look anything like stone rows. They look like fences.
That's not to say that other types of stone fence aren't prehistoric though.
Another thing I've been thinking about is whole concept of fencing. The idea of having loads of agricultural boundaries for livestock is relatively modern. Why bother fencing in sheep? If there's a shepherd on hand to look after them, they won't get lost or mixed up with other flocks.
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