The wall is modest by any measure, a little over five metres long and barely above knee height, built from large boulders in the quiet, practical manner of someone marking out land they intended to use. What makes it remarkable is not its scale but its situation: it has been sitting beneath the bog for roughly three thousand years, sealed away while the world above it changed entirely.

A radiocarbon date taken from peat at the base of the wall placed it at approximately 2810 years before present, give or take eighty years, which puts its construction somewhere around the late Bronze Age. Radiocarbon dating works by measuring the decay of a carbon isotope in organic material, and here the sampled peat gives a minimum age for when the wall was already in place and the bog had begun to form around it. The wall runs northeast to southwest across the southern side of the valley at Dromteewakeen, sitting on a thin layer of peat and covered by substantially more. Most striking of all, the roots of a pine stump, still in its original growing position, extend directly over part of the wall. That pine grew after the wall was built, rooted into the accumulating peat above it, and has itself since been consumed by the bog. It is a small but precise stratigraphic story: wall first, then peat, then tree, then more peat, then the bog surface as it exists today.

The exposure is visible in a cut-away section of bog, where the vertical face of the peat reveals the boulder course in cross-section. Intra-peat walls of this kind, sometimes called bog walls, are not uncommon in Ireland, but they are easy to overlook precisely because they exist below ground level, only becoming visible when cutting or erosion opens a window into the layers beneath.