What survives from Jordanstown is not a monument in any conventional sense, but a series of post-holes and pits, the kind of evidence that tends to get bypassed in favour of more photogenic archaeology, yet quietly carries some of the oldest dateable human activity in the area.

The site came to light in 2007 during excavation ahead of improvements to the N9/N10 road between Kilcullen and Waterford. On a north-east facing slope, archaeologists uncovered the remains of a slightly curved fence or palisade, a line of upright timber posts set into the ground, represented by nineteen post-holes and a further three possibly connected ones, stretching roughly twenty metres in length. Radiocarbon dating placed this structure firmly in the Early Bronze Age, between approximately 2122 and 1938 cal BC, a period when communities across Ireland were farming, trading, and beginning to work with metal. About eight metres to the south, a small cluster of three pits produced a very different date, falling within the Iron Age, between roughly 382 and 206 cal BC. Several other pit clusters in the vicinity remain undated. The palisade itself is a simple but practical form of enclosure or boundary marker, perhaps defining a field edge, a homestead boundary, or an area for livestock; without more context it is difficult to say which, but its slight curve suggests deliberate design rather than accident. What is most striking is the gap between the two phases of activity: the Bronze Age fence and the Iron Age pits are separated by well over a thousand years, suggesting that people were drawn back to this particular slope long after whatever the palisade once enclosed had been forgotten.