Hob, I met with some friends today, one of whom is a sculptor - we discussed this a conundrum. The internet hosting site for BRAC did in fact go under and it is well recorded that much valuable data was lost therefore the internet alone should not be relied on. I think that much is a given. With regard to an appropriate 'symbol' to date the carving we agreed that the only one was '2012' and it should be on the same stone as the carving but not on the face of the carving. It was suggested it should be on the side of the rock (perhaps even below earth level).
Best wishes
tjj
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