During archaeological monitoring of the Airport-Balbriggan Bypass in County Dublin, a fulacht fiadh was identified at Thomondtown, appearing not through a planned excavation but through the routine watching brief that accompanies major infrastructure works. That circumstance alone says something about how much of Ireland's prehistoric landscape remains just beneath the surface, waiting for a digger bucket to pass close enough.

A fulacht fiadh, sometimes spelled fulacht fia, is a type of Bronze Age cooking site found in enormous numbers across Ireland, typically consisting of a trough dug into the ground near a water source, and a mound of burnt and shattered stone accumulated beside it. The method involved heating stones in a fire, dropping them into a water-filled trough to bring it to boiling point, and using the hot water to cook meat or process other materials. The shattered stones, rendered useless by repeated heating and cooling, were discarded into a characteristic horseshoe-shaped mound. At Thomondtown, the site comprised a single trough filled with heat-shattered stones and charcoal-enriched soil, with an associated burnt mound. The find was recorded by Lynch in 2004 and compiled into the archaeological record by Geraldine Stout, with the site details uploaded in August 2011.

There is nothing to see at Thomondtown today in the way of a preserved monument; the site was identified during road construction monitoring, which means it was almost certainly disturbed or fully investigated as part of that process. Its interest lies less in what a visitor might stand before and more in what the discovery represents: a small, functional prehistoric site tucked into a stretch of north County Dublin that has since been reshaped by modern transport infrastructure. For anyone following the archaeology of the bypass corridor, the Lynch 2004 reference offers the closest thing to a detailed account of what was found.