Yet that is precisely what happened near Croagh in County Limerick, where topsoil-stripping along the route of a Bord Gáis Éireann Pipeline to the West exposed what turned out to be a small cremation cemetery, invisible at ground level and wholly unmarked in any modern record. There were no mounds, no standing stones, nothing to suggest that the dead had been placed here deliberately. The site was entirely flat, which is what gives this category of burial ground its name, and it is that very plainness that makes such sites so easy to miss and so easy to destroy.

The excavation, carried out by archaeologist Emer Dennehy under licence 02E0645, revealed a modest but telling collection of features. At the centre of the site was a small subcircular cremation pit cut into the underlying boulder clay, measuring roughly 0.7 metres north to south and just 0.33 metres deep. Its fill contained burnt bone and charcoal fragments concentrated towards the middle, along with a mix of sandstone and limestone fragments in a dark silty clay. A capping stone, which would originally have sealed the pit, had already been lost during the topsoil-stripping. Nearby, a conical post, roughly 0.37 metres in diameter and 0.43 metres deep, had been set into the ground. Its charcoal-rich upper fill suggests it had been deliberately burnt or charred, and it may have served as a grave marker, a way of signalling the burial to those who knew to look. A third feature, an irregular three-sided pit, was ultimately judged to be non-archaeological, the result of natural disturbance to limestone boulders in the area rather than deliberate human action. Crucially, a further set of cremation burials was identified approximately ten metres to the south-east, recorded separately as BGE 3/60/2. Though the two sites were initially given different reference numbers, the archaeological assessment concluded they should be read as components of a single cemetery.

Because the site was identified during pipeline monitoring rather than a planned excavation, it exists now primarily in the archaeological record rather than as a visible feature in the landscape. The area around Croagh shows no surface trace of what was found beneath it. Anyone with an interest in this kind of archaeology would do better to consult the excavations.ie database, where the full site report is accessible, than to go looking for something to see on the ground. What the site illustrates, more than anything, is how much of early Irish funerary practice remains buried and unrecognised until infrastructure work happens to cut through it at the right angle.