That consistency across nearly a century of mapping suggests something more than cartographic habit. This is a mass-rock, a category of site that emerged from the Penal Laws era, when Catholic worship was suppressed and priests conducted Mass outdoors, often at exposed natural rocks in fields and hillsides, away from the scrutiny of authorities.

The rock's religious life is documented as early as 1839, when an Ordnance Survey field book recorded that it had formerly been used as an altar and that it was, at that time, still held in considerable veneration by local people, who would come to pray there. By the time the antiquarian Grove White visited in 1906, that active devotion had faded noticeably, suggesting the transition from living site to remembered one had already taken place within living memory. There is an additional curiosity attached to the place, recorded by a Dr Johnson from local tradition: a passage running from a fox covert in the neighbouring townland of Corbally is said to pass directly beneath the rock. Whether that passage is a natural fissure, a constructed tunnel, or something else entirely, the notes do not say, and the tradition itself adds a slightly subterranean quality to a place already freighted with secrecy and concealment.