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 .