That, in itself, makes it worth thinking about. The stone was a bullaun, a type of ancient rock, usually a large boulder, into which one or more cup-shaped hollows have been ground or pecked, and which are found widely across Ireland, often in association with early ecclesiastical sites or holy wells. This particular example was described as carrying roughly thirty-seven such cup-marks across its flat upper surface, each no more than 0.75 inches in depth and around seven centimetres across. At some point between the mid-twentieth century and more recent surveys, it simply ceased to be locatable.

The site was recorded on Ordnance Survey maps of 1836 and 1876 under the name Lackmogue, a compound that quietly contains its own history. The first element, lack, is an anglicisation of the Irish leac, meaning a flagstone or flat rock, while Mogue refers to St Mogue, a local saint associated with this part of Cavan. The scholar Davies, writing in 1948, provided the description that later records relied upon: a rough sandstone boulder with its cup-marked upper face, sitting in a landscape that carried the memory of a saint's name without any surviving structure to go with it. Whether the stone has been buried, moved, broken up, or simply overlooked in changed ground conditions is not known.