>Shuffles feet awkwardly<
Aye, dating modern CnRs is a good idea, especially if they're actually in the landscape. Jan, Stan and Aron have all had enquiries from Tynesiders who thought they'd found previously unrecorded CnRs on top of a landscaped spoilheap. Admittedly it looks a bit more worn in these days and I've put a couple of extra rings on it in the last few years.