Well, hubris is everything, isn't it? If truth be told, this is not breaking news at all; we don't know if the quarry is Neolithic or not; and the hilltop in question is not all that remote........
But read on, dear reader. This is actually quite important, since what we are talking about here is the only thing in the Presely region that looks remotely like a prehistoric quarry. Forget about Rhosyfelin and Carn Goedog -- they are already consigned to the dustbin of history.
Strictly, we are talking about quarries, since there are scores of pits stretched out across the landscape.
Cnwc yr Hydd is a strange site on a broad hill summit not far from Tafarn y Bwlch, on the northern flank of Preseli. (Tafarn y Bwlch is where the new Preseli visitor centre is being built.) The gentle hill summit is on the common, and is open moorland. It has an altitude of 339m (1112 ft). Details: SN082344.
To the west is the farm of Gernos-fach, and not far away is the strange embanked circular enclosure described here:
The southern flank of the hill has a series of broad platforms or ledges, on one of which the standing and recumbent stones of Waun Mawn are located. This is where MPP and his team looked for a "proto-Stonehenge" setting of bluestones, without success, a few years ago.
Here, running across the summit, we find by far the most convincing assemblage of quarrying traces in the Preseli region.