The wall follows a segmental, gently curved line rather than the straight-sided or irregular outline typical of later burial grounds. That curvature is the kind of detail that tends to signal something older underneath.

Early Christian ecclesiastical enclosures, which were the defining feature of the early Irish church from roughly the fifth century onwards, were typically laid out as circular or near-circular enclosures marked by a bank, ditch, or wall. The roundness was not incidental; it reflected both practical and symbolic conventions of the period. When later communities continued to use such sites for burial, they often preserved the curving boundary without necessarily understanding, or caring about, its origins. At Griffinstown, the segmental form of the graveyard wall was noted by the researcher Leo Swan in 1988 as a possible indicator of just such an enclosure surviving, at least in outline, beneath or within the present boundary. The suggestion is tentative, as Swan himself indicated, but the curved wall remains a quiet piece of evidence that the site may have served a religious function well over a thousand years ago.