History

The question of when Carrowmore was built is one of the most debated in Irish prehistoric archaeology. Radiocarbon analysis of cremated human bone from tomb chambers has produced dates as early as 5400–4700 BC — which, if valid, would place Carrowmore’s first phase of construction at the very threshold of the Neolithic in Europe, roughly contemporary with early farming in the Balkans and predating the pyramid age in Egypt by three thousand years. Critics of these early dates argue that contamination from old organic material (the “old wood effect”) inflated the results and that the main construction phase falls closer to 4000–3700 BC, which still makes Carrowmore one of the oldest megalithic complexes in Ireland and western Europe.

What is clear is that Carrowmore was a communal cremation cemetery. The tombs are not elite monuments in the way the great passage tombs of the Boyne Valley are — they lack the astronomical orientations, carved stone art, and restricted access corridors that characterise later Irish megalithic tradition. They are instead relatively simple structures: collective deposits of cremated bone beneath boulder-ringed dolmen chambers, implying a phase of megalithic practice that was less hierarchical, less politically organised, and perhaps more widely distributed across Neolithic communities than what followed. Carrowmore may represent the earliest stratum of an Irish megalithic tradition that culminated, several centuries later, in the great passage tombs at Newgrange, Knowth, and Dowth in the Boyne Valley.

By the early 19th century, intensive agriculture and land improvement had already destroyed more than 40 monuments; later surveys found only about 60 intact. Systematic excavation began in the 1970s under the direction of Göran Burenhult, whose work produced both the contested early radiocarbon dates and a comprehensive record of the tomb structures and their contents. Burenhult’s seasons of excavation, combined with more recent investigations, have made Carrowmore one of the best-documented megalithic complexes in Ireland.