I was just trying to provoke debate, really. The two I have met have both been great -m and very helpful. But then I've not bothered taking them anything that isn't certainly identified. I took a piece of bog oak last year - and he photographed it, and that, but we both knew it fell out of the categories. I've a hammerstone for him this year - I've been weathering it for three or four years to get the colours better. The chip-outs are clearly identifiable, so there should be no dispute as to its antiquietey !