Could not get close to this stone that I spotted across a very damp field. I would think it is about 5ft high and quite broad. It is in a triangular field bounded on all sides by minor roads just to the north of Aberporth.
It is marked on the map as Pillar Stone and a bit of searching on the web came up with the facts that it was 'discovered' in the early 1800s when a tumulus was removed including a heap of stones. The stone was re-erected and an urn and several supposedly Roman coins were found. These were given to Colchester Museum... who now have no record of them!