A. A small square building (also used as benchmark 463.5ft) is shown on OS 1st edition mapping with a flagstaff some 5m to the north-northeast. Modern aerial photography confirms that the building is no longer extant, but an outline can seen be seen at a convergence of paths.

Sources include:
Dyfed Archaeological Trust HER Ref: 31978
NAW Aerial Photography 2006-9
OS 1st edtion 25in mapping

Maritime Officer, RCAHMW, December 2012

B. The base of a small square structure. It consists of walls about 0.45m thick rendered on the inside, mainly of stone but with brick used at the side of the single doorway at the E side of the structure. Overall it is 3.4m x 3.6m with a maximum height of 0.7m. Described as Coastguard Lookout on 2nd edition 25 inch O.S. map. On the same map a few yards N is what is described as a "Flagstaff" - no sign of this now but probably associated with the lookout. Visited in 1995.

Source: National Trust Report: John Latham. 1995. Archaeological Survey of Pen Dinas/Dinas Island (unpublished).