No grave markers, no visible disturbance, no surface trace of any kind survives to confirm what memory has preserved.

The site belongs to a broader and quietly sorrowful pattern in the Irish landscape. Killeens, sometimes also called cillíní, were informal burial grounds used for unbaptised infants and others considered ineligible for consecrated ground under Catholic practice. They were frequently placed at the margins of society, literally and symbolically, often at the edges of townlands, beside old earthworks, or within the enclosures of pre-Christian monuments. Killeen Fort is a cashel, which is to say a stone-walled ringfort of the kind common across the west of Ireland, typically dating from the early medieval period. The association between such ancient enclosures and the burial of unbaptised children was widespread; their antiquity and ambiguous sacred status made them feel appropriate for those who occupied an equally ambiguous place in the religious order. At Tonacooleen, the tradition of a children's burial ground in or near this cashel has survived in local memory, even as the physical evidence has vanished entirely from the surface.