That mound, measuring some eight and a half metres by thirteen metres and around forty centimetres deep, is what archaeologists call a fulacht fia, a type of site found in considerable numbers across Ireland and Britain. The basic idea is straightforward: stones are heated in a fire, dropped into a water-filled trough to bring it rapidly to the boil, and the cracked, spent stones are then raked aside. Over repeated use, those discarded stones accumulate into the distinctive horseshoe-shaped mound that survives in the landscape. What they were used for, whether cooking meat, processing hides, brewing, or bathing, remains genuinely debated among researchers.

The site at Clonard came to light during excavation carried out under licence number 08E055, ahead of road construction works. Beneath the burnt mound itself, archaeologists uncovered a large waterhole, two troughs, and two small pits; the waterhole in particular was likely central to how the site functioned, supplying the water that made the whole heating process possible. Charcoal recovered from the burnt mound material included ash, oak, wild cherry, bird cherry, and willow poplar, reflecting the kinds of woodland that would have surrounded the area during the Bronze Age. A radiocarbon date obtained from hawthorn and crab apple charcoal taken from one of the lower fills of the waterhole returned a calibrated range of 1886 to 1746 BC, placing the activity firmly in the early Bronze Age. The results were published by McLoughlin in 2009.

As with many sites revealed by developer-led excavation, there is little to see at Clonard today; the mound has been recorded and the road built. The value lies not in visiting a visible monument but in knowing the landscape carries this kind of depth. Anyone with an interest in Bronze Age settlement patterns in the greater Dublin area would do well to read McLoughlin's report, which gives a fuller picture of what the excavation produced. The charcoal assemblage in particular, with its mix of orchard and woodland species, offers a quiet, specific detail about what the surrounding environment looked and smelled like nearly four millennia ago.