We couldn't work out how those peat formations were formed Jack and they are quite tall, Wayne is 6 foot and they tower above him.
It's possible that in times gone by they used peat as a fuel and did systematic excavations and that ceased when the cottages and the quarries were abandoned, but that is only a guess.
There was a plane crash at Craig Yr Ysfa in 1940 and some remains of the WW 2 Bristol Blenheim remain in the area, I did make a note of the coordinates for the various wreckages the night before our walk but then forgot to take them with me!
It's sad to see the bodies of those ponies on the mountains, there is no shelter for them up there and the weather has been atrocious.
The skeleton of the pony we saw had been picked clean and it's hind legs were missing but we found them some distance away and we started to wonder what animal living up there would be able to do such a thing!
Whatever creature did that, at least we won't have to worry about the animal as early birds like yourself will have frightened them away by the time us OAP's get up there.