The sub-circular cairn on top of Trum Gelli measures approximately 10 metres square and 1.5 metres high. A wooden-posted wire fence dissects this feature. The top of the structure is capped by a rounded concrete surface approximately 2 metres in diameter, with a square depression and iron pin in the centre. This could represent use of the cairn as a temporary trig point.

RCAHMW, 14th November 2007