The evidence amounts to a single granite lump, roughly rounded, weighing around five hundredweight, with a curious screwlike hole bored through its centre. That hole is the crux of the matter: it suggested to at least one nineteenth-century observer that a cross shaft had been threaded or fitted into it from above, making the stone not a monument in itself but the foundation for one.

The find was recorded by Eugene O'Curry, the Irish scholar and antiquarian, who noted in 1837 that the stone had been turned up by a workman digging at the site of Archbishop Fowler's bathhouse. Fowler, as Archbishop of Dublin, would have had connections to Tallaght through the long ecclesiastical history of the area, which had been an important early Christian settlement. O'Curry's description is careful and specific: the granite is rough and roundish, the hole screwlike, and his interpretation, that it looks like the pedestal of a cross into which the cross itself was screwed, is offered as inference rather than certainty. William Handcock, writing later in 1899, noted that the stone had rested for a time at the end of Friar's Walk, a detail that places it, however loosely, within the local landscape. What became of it after that is not recorded.

The precise location of the stone is now unknown, and there is no monument to visit in any conventional sense. What remains is the archival trace: a description, a weight, a hole in a granite lump, and the possibility of a vanished cross somewhere in Tallaght's layered past. For anyone interested in the archaeology of early Christian sites in the Dublin area, the record compiled by Geraldine Stout for the sites and monuments database is the closest thing to a fixed point. The site itself, if it ever had one in any meaningful way, has long since been absorbed.