Newgrange 26
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The talk by Gabriel Cooney was pretty much along the same lines as the 2006 paper, topped up with the new publication from Ann Lynch.

One interesting thing that came up was Muiris O'Sullivan found quartz wedged in between where a kerbstone had split from the top, so at Knockroe this quartz seems to have fallen from the cairn at some point. I knew Muiris had said before that he felt it had been on the cairn but wasn't aware of the particular findings that led to that belief.

He also said that while Ann Lynch's new dates from a cattle tooth and a bronze age flake under the quartz suggested it wasn't there until the Bronze Age, finds of grooved ware on top of the quartz during the O'Kelly campaigns conflicted with this.

Thanks for the update .

Just had a quick look at the O'Sullivan paper and no mention there of the wedging . Little doubt that the quartz came from above but it's worth noting that quartz is often found wedged in fissures at rock art sites , with the suggestion is that it is intententional . It may well be in some cases but having seen a few examples I am not always convinced and much of it could be seen as being natural.

To add to the dating problems there is the lack of quartz under fallen K 96 ,which opens another can of worms .