Twyn Y Glog and a marked stone. 

Wow! That's great to hear, Craig and thanks for the heads up. I can recall Ross and others saying that there were numerous Twmp's surrounding Twyn Y Glog. Shall have to get to this one you have described.

@paulchallenger8153 yes I've spotted other suspicious looking sites around there ,been there many times since reading about it in 2012 I've had a good look around there and I also think there's a long barrow type of mound around 700 yards south east of the twyn y glog and possibly another pointer marker stone pointing in the direction of the twyn y glo from the opposite side of the valley on pen y foel, any issues finding these places ....feel free to come back to this comment for further directions be more than happy to help... I met Ross once up on a mound in merthyr tydfil I did mention this to him but he was swamped with sites to visit lol

@@craigmoyle2924 Superb detail Craig, I'm looking forward to a re-visit and have mentioned your post to Tim, if we go up there together, my money would be on ending up at the Brynfynon in Llanwonno...lol. I told Ross about the markings I discovered but he must have forgotten as Bob Morgan said the two of them were at the rock a couple of days before he crossed over and missed checking my assertions. He did, indeed, have enough work on to swamp most of us.

@paulchallenger8153 that's an interesting name for a pub, makes me wonder if there's an old well or spring nearby with a name like that

@@craigmoyle2924 I met the curator of the Church Trust there one day and he said something about St Mary.