Recorded on the Ordnance Survey's 1897 twenty-five-inch map with the confident label "Cromlech", the feature has spent well over a century occupying that uncertain borderland between archaeology and geology, between human intention and the slow work of ice and stone. A cromlech, in older antiquarian usage, typically referred to a dolmen, the portal tomb form in which a large capstone is raised on upright supports. The problem here is that the evidence for any of that human effort is, at best, ambiguous.

The site sits in rough pasture, around 200 metres northeast of the townland boundary with Moorestown, and it was notably absent from the earlier 1840 Ordnance Survey edition. By the time scholars Ruaidhri De Valera and Seán Ó Nualláin came to assess it for their 1982 survey of megalithic tombs, they were working partly from a photograph published by Lynch and Fogerty in 1911. That photograph showed a large block propped at one end by a cluster of small stones, with the opposite end apparently resting on natural rock outcrop. Their conclusion was pointed: the feature "appears to be largely natural." The possibility that someone in the nineteenth century, or earlier, looked at a glacially deposited erratic and read into its tilted silhouette something deliberate and ancient is entirely plausible. Two other recorded features lie nearby, a possible megalithic structure some eight metres to the west-northwest and a possible robbed-out cairn about 150 metres to the southeast, which suggests the summit of Slievereagh was at least considered significant at some point, whatever the original feature turns out to be.

Visitors should be prepared for the likelihood that there is now nothing visible to find. Aerial imagery from the Digital Globe orthoimage survey taken between 2011 and 2013, as well as Google Earth images, show no surface remains at the recorded location. The summit terrain is rough pasture, and the site is not marked on modern recreational maps. Anyone drawn to this corner of County Limerick by curiosity about the "Cromlech" label is really arriving at a question rather than an answer, which, depending on your outlook, may be the more interesting thing to seek out.