They mark, in all likelihood, a second burial structure that has never been disturbed.

The known grave belongs to a class of prehistoric burial known as a cist, a small stone-lined box, usually cut into the ground, in which a body or cremated remains were placed. These are found across Ireland and Britain and generally date to the Bronze Age, though the form persisted across several periods. The site at Áth An Charbaill drew closer attention when, as Cahill and Sikora noted in their 2011 publication, the two nearby standing stones were observed to be deliberately set into the earth rather than simply lying on the surface. The phrasing used was careful but pointed: "almost certainly" the markers of a further, as yet untouched, burial structure. That second structure, if it exists, remains where it has been for millennia.