Rather than the rectangular enclosures that became standard in later centuries of Irish burial practice, this one curves gently in on itself, forming a sub-circular plan that points toward something considerably older than the present boundary wall. That rounded outline is a fairly reliable sign that what stands here was once an early ecclesiastical enclosure, the kind of sacred precinct established by monastic or early Christian communities from roughly the sixth century onward, long before the formal parish system took hold.

What makes Colmanstown more than simply a suspiciously curved graveyard is what can still be traced along the eastern and north-eastern interior. There, tucked against the graveyard wall, are the surviving earthworks of a bivallate enclosure, meaning one defined by two concentric lines of bank and fosse rather than just one. A fosse, in this context, is a defensive or boundary ditch, and the remains here are recorded in some detail. The outer fosse measures around 2.75 metres wide and just over a metre deep; the inner bank reaches 0.8 metres high and 1.25 metres across; and the inner fosse is wider still at 4 metres, with a depth of approximately 1.1 metres. These are modest but legible earthworks, the kind that could easily be walked past without recognition. The site carries the record number DU020-009002- and was compiled by archaeologist Geraldine Stout.

The graveyard remains in use, so access is generally straightforward, though this is a quiet rural location and there is no formal visitor infrastructure. The earthwork traces are most readable in low winter light or in early spring before vegetation thickens, when the slight ridges and hollows of the inner bank and fosses cast enough shadow to become visible. The E/NE quadrant is the place to focus attention, moving slowly along the inside of the boundary wall and looking for the subtle undulation in the ground. It is the kind of site that rewards patience and prior reading rather than a casual glance, the layered remains of a Christian community whose name and date we no longer know, folded quietly into an ordinary-looking corner of County Dublin.