would love to read that paper, theres a few carvings on Middleton that mix natural & manmade thats for sure.
Hi All, Here's just another one with very fine parallel grooves but of a very different kind. http://rockartuk.fotopic.net/p16531899.html
Ireland does have quite a few that mix natural with not natural. This is one of my faves:
http://www.megalithomania.com/show/site/1416
Rich , the paper is in a recent oxbow publication "Set in Stone :New Approaches to the Neolithic in Scotland" eds. Vicki Cummings & Amelia Pannett . £30 . But worth it for the Andy Jones alone . Quite a lot on chambered cairns too.