Indeed i hope this is a case of ignorance, if you are only copying things from the older books when chalking was the done thing, and you made an error of judgement, then that is fair enough. so lets hope it is an error and not just someone trying to be smart?...

I mean there is no reason to chalk RA now, no need to number the panels, no need to sit measuring sticks next to them either. Most of us have all the books in our collections that describe and catalogue most of the rock art in the uk, so to repeat the process of chalking, measuring etc, is not needed, so there is not alot of reason to do it.

Lets hope you stick to taking good photographs of the RA instead.