Hi George,
Yes, you are very welcome to come and visit anytime. Look forward to hearing from you in the near future. Incidentally, most, if not all, of the incised stones here are dolerite not granite. There is a dolerite outcrop some 2km away but virtually no dolerite boulders anywhere around except on my property....as if someone has collected them together and deposited them here. The dolerite gives a very fine incised mark due to the small crystal size.