The fragment, roughly 70 centimetres long and just under 30 centimetres high, bears a smooth curved hollow that has never quite been explained. It is either the remnant of a round-headed window opening from a twelfth-century church, or it is something else entirely: a bullaun stone, which is a boulder with one or more deliberately carved cup-shaped depressions, associated with early Christian sites and sometimes thought to have been used for grinding or ritual purposes. Both readings are plausible. Neither has been confirmed.

The stone was found in the graveyard attached to the site of an early church, and that context matters. Early medieval ecclesiastical sites in Ireland frequently accumulated material over centuries, with architectural fragments, grave slabs, and carved stones gathering in graveyards long after the structures they once belonged to had crumbled or been dismantled. If the curved ingoing does represent part of a window, the diameter of approximately 42 centimetres and depth of 28 centimetres are consistent with the modest round-headed openings characteristic of Irish Romanesque architecture from the 1100s. The sandstone itself is a relatively soft, workable material, which makes it suitable for carved detail but also more vulnerable to weathering and damage over time, which may explain why so little of the original form survives.