I am still mystified as to why anybody should ask Facebook to remove those images from the Pensarn dig that were posted up by Emyr Jones and myself. Anyway, they are gone, and have not returned in precisely their original form, although what is out there is out there, and I have put two of the images back onto my Facebook page so as to inform and educate those who are interested in such things.
In our speculations on what the archaeologists might have been looking for in the current dig, we made a reasonable stab at it by suggesting they were looking for a Neolithic passage grave surrounded by a stone circle which could then be labelled as a "proto-Stonehenge". This would also fit nicely into the MPP thesis that the stones would be invested with significance since they were set up around "a place of the dead" -- and could thus be linked with Stonehenge, which is also seen as a place of the dead. This would then be a reason for those old Neolithic folks to cart away these "stones of the ancestors" as tribute stones all the way to Stonehenge, to be built into the monument around 5,000 years ago. Emyr also picked up on something like this when he talked to the diggers, and indeed MPP has suggested as much in his talks.
In the event, what we have at Pensarn, by the look of it, is a Bronze Age cist burial site maybe with a sharp edge or kerb and maybe segmented internally as well. A serious disappointment to the quarrymen. But all will be revealed in due course, if the news and image blackout allows........
So what were the diggers hoping for? Something like the Garn Ochr Cairn, I suspect. It's a bit confusing because it is also called Henry's Moat, the Dyffryn Stones, the Dyffryn Syfynwy Stones and the Dyffryn Circle. It is classified as a ring-cairn or henge. It lies between Tufton and Rosebush, on the southern flank of Mynydd Preseli, at grid ref SN05922845. In the NP Figgis book it is site number 33. Here is the link to the Coflein record:
Garn Ochr Cairn is a greatly disturbed and much denuded round cairn some 21.3m in diameter and surviving to only 0.5m high. It was contained within a ring of thirteen orthostatic - earthfast - stones, although only ten remained in 1966, two of which were prostrate. The stones are up to 2.0m long.
This is probably a prehistoric funerary or ritual monument. It has been supposed that there was originally a burial chamber within the ring although there appears to be no evidence for this. Three stones, now gone, some 12m to the north-east, were seen as evidence for a burial chamber.
Sources: RCAHMW & M Pembrokeshire Inventory (1925), 118 No. 313
Daniel 'The Prehistoric Chambered Tombs of England and Wales (1950), 204 No. 38
Driver 'Pembrokeshire: Historic Landscapes from the Air' (2007), fig 65