In 1935, a gravel extraction operation at Ploopluck in County Kildare broke into something far older than the workers expected. Buried within an esker, the long sinuous ridges of sand and gravel deposited by glacial meltwater streams at the end of the last Ice Age, lay a small prehistoric cemetery that had been undisturbed for thousands of years. The discovery was entirely accidental, the kind that tends to happen when machinery meets landscape, and it offers a glimpse into a burial tradition that was already ancient when much of Irish history was still unwritten.

Four pit burials were recorded at the site. Three of the individuals had been placed in the ground accompanied by bowl food vessels, a type of pottery associated with the Early Bronze Age, typically dated to the second millennium BC, and thought to have held offerings or provisions for the dead. One of these was a crouched inhumation, meaning the body had been drawn into a foetal-like position before burial, a posture common in Bronze Age funerary practice across Ireland and Britain. The fourth burial was unaccompanied. A possible fifth burial, containing the remains of four individuals along with a bowl food vessel and a sherd of an urn, may or may not belong to the same cemetery grouping; the association, as noted by Raftery in 1951, remains uncertain. The presence of multiple individuals in that fifth pit, if it is related, would make Ploopluck an unusually complex site for the period.