A solution to the long walk is too drive up the little lane up to the church ( there's a small parking area for the church so park thoughtfully) then walk along up the farm track beneath the hill it rises though. keep on it till the fort appears on the right about a half a mile away. There is a house platform to the left, but little can be seen.
It's a long walk from everywhere this one, I came from by the Cae Coch farm and menhir to the south-west. Looking at the map the fort is on the left of the footpath, but the fort and its small hill is so assimilated into it's surroundings that I walked past it and on to the highest point around, from there I could see it quite clearly. You might be better coming from the other side after parking by the old church and spring.
It isn't a large fort but it is in a great place overlooking the entire river valley below(presuming they utilised the two other higher hilltops nearby). The ditch is mainly on the western side and is at least 7ft from top to bottom. Inside that bank and ditch is the remains of the stone built wall just the scraps of which are left, amongst the wall rubble are some large boulders were they here already or moved into place to stregnthen the wall.
Which brings us to the strangely out of place long boulder, it must have been placed there i'm sure, it's right in the middle of the fort and carries an air of usefullness.(if thats possible)
Small Hill fort with a large white recumbent stone in the centre.
This is a very different type of stone from that which is found in the immediate vicinity. There's a hollow just next to the stone, possibly it was underground at some point, but I can't see how it could be a glacial erratic, as the stratum it seems to come from is nearly at sea level, well below the height of the Tal-y-fan. So my instant response to seeing it was to think that someone had gone through a lot of bother to drag it up here. Mind, I'm no geologist and could be totally wrong about this. There are also cavalry tripping stones in the main entrance, that I am sure of.
The site has a clear view of the Conwy estuary and the Great Orme, but is still nicely tucked away from sight from the immediate locale. In retrospect, how I wish I'd tarried longer. The white stone of Caer Bach can be blamed for all of the posts I've clagged this website up with, it was the one that sent me looking for an online version of tma in the first place.
Coflein (thanks Kammer for bringing Coflein's existance to my attention) says:
Small hillfort on rounded hillock, two lines of defence circle the hillock, the outer consists of an earthen bank and an external ditch. The inner defence is a heavily robbed stone wall, between 4 and 5 metres wide. The entrance ramp cuts both defences on the SE.
No mention of the strange, big, white and distinctly out-of-place stone. Nor of the chevaux-de-frise (sp?) on the NE entrance.