Burnt mounds are among the more intriguing monuments of prehistoric Ireland. They are thought to represent cooking or industrial sites where stones were heated in a fire and then dropped into a water-filled trough to bring it rapidly to the boil, leaving behind a characteristic midden of shattered, blackened rock. The Coolacork example was exposed during roadworks on the N11 improvement scheme, the kind of infrastructure project that has, over recent decades, produced a remarkable quantity of archaeological material in Ireland.

Excavation by archaeologist Yvonne Whitty revealed not one episode of use but three distinct phases, each cutting into or through what came before. The earliest phase, dated by radiocarbon analysis to the early Bronze Age, included a stone working area and a wooden-lined trough, the timber presumably serving to hold water in place. Mixed into the burnt material of this phase were twenty sherds of Carinated Bowl pottery, a type associated with the early Neolithic, several thousand years older again. These were not in their original position, however, and are understood to have been disturbed and redeposited, perhaps by the Bronze Age activity itself. After that first phase, a second trough and an associated spread of burnt material were dug into the site, and then a third trough cut through those deposits in turn. The sequence suggests that this particular patch of ground at Coolacork was returned to, modified, and put to use across a considerable span of time, each generation of users digging into the traces left by the last.