Julian Cope presents Head Heritage

No offence taken, none at all. I've been pondering, and have concluded there ought to be some kind of overt sign in a modern repro, some element of the thing, be it a carving, a standing stone or earthwork, that makes direct reference to it's otherness when compared to it's ancient counterpart.

Millenium stones all seem to have the date on them, modern stones are usually easily discernable by the lack of weathering, and earthworks would all have totally different stratigraphy from old ones, but despite this, the only common method of identifying new carvings seems to be by the methods discussed here, i.e. by recording. Ideally, a photo of the rock surface before carving and after carving. That would be difficult for anyone to get mixed up with.