Wales 38
Image by Chris Collyer
Wales

Arrow Stones

http://www.megalithomania.com/show/image/1550

They're all over the place. I think most of these are equally likely to be from more recent blade sharpening.

They really do look like the genuine 'I am'. Nice and clear.

But how would you know how old they are?

What about these?
http://www.themodernantiquarian.com/post/40354
Probably not from arrows, but could be axes, especially given the other axe-related carvings in nearby cairns?