Knocknarea passage tombs

A passage tomb is a burial chamber covered in earth or stone, with a narrow access passage made of large stones. The type is found along the Atlantic seaboard of Europe, and in Ireland and Britain passage tombs often lie in large clusters, called cemeteries. Ireland has four great ones, known as the "big four": Brú na Bóinne in the Boyne Valley, Loughcrew, Carrowkeel and Carrowmore, each with its own character. Most were built in the fourth millennium BCE. The full article, “Irish and British passage tombs”, follows below under About this kind of monument.

The Atlas shows 3400 BCE to 2900 BCE for this site, but that is a regional estimate for this kind of monument, not a date for this particular passage tomb. No excavation, radiocarbon sample or other measurement is recorded for it, so the real age could fall anywhere within the range, or outside it.

The range rests on this regional background (source: the Wikipedia article “Megalith”): The passage grave of Newgrange in Ireland belongs to the megalithic constructions of c. 3400 BC.