Stoneshifter wrote:
The Bolton rock artists were pretty stifled, judging from what remains. But on the topic of fissures and channels please take a look at the black and white image just posted.
Cheers S. .There is no doubt that as well as cups 'n stuff there are other markings that were made , possibly at the same time , by the engraver(s) that are not in that tradition .These can vary from scratches to deep incisions but it is very difficult to prove human agency and I think that applies to your stone . 