The great mapping exercises of 1842 and 1905 passed over it entirely, leaving no mark on either edition of the six-inch maps that documented the Irish landscape in extraordinary detail. It was not until the 1935 survey that the feature finally appeared, rendered as a circular area picked out by a ring of dots with a triangulation point at its centre, the kind of notation that suggests surveyors recognised something ancient beneath the undergrowth without being entirely sure what to make of it.

Cairns are among the oldest surviving monuments in Ireland, typically mounds of heaped stone raised over prehistoric burials or used to mark significant points in the landscape. Their hilltop positions were rarely accidental; height carried meaning, whether for the visibility of the monument itself or for the view it commanded. Why this particular cairn escaped cartographic notice for so long is unclear. It may have been heavily obscured even by the nineteenth century, its stones scattered or buried under vegetation, only becoming legible as a coherent form once the forestry planted around it gave the 1935 surveyors a clearer sense of what the summit held. The triangulation point added at some stage would have required a surveyor to physically stand there, which makes the earlier omissions all the more curious.

The site remains inaccessible today, dense with overgrowth, and the forestry that surrounds it on the hill does nothing to make approach straightforward. What can be said is that the circular outline recorded in 1935 is still the primary record of what lies there, a faint dotted ring on an old map standing in for something that has been quietly present on that hillside for a very long time.