A passage grave or passage tomb consists of one or more burial chambers covered in earth or stone and having a narrow access passage made of large stones. These structures usually date from the Neolithic Age and are found largely in Western Europe. When covered in earth, a passage grave is a type of tumulusMore technically called a tumulus, and also referred to as a barrow. which is found in various forms all over the world. When a passage grave is covered in stone, it is a type of cairn.
The interior of passage graves varies in number of burials, shape, and other aspects. Those with more than one chamber may have multiple sub-chambers leading off from the main burial chamber. One common interior layout, the cruciform passage grave, is cross-shaped, although prior to the Christian Era and thus having no Christian associations. Some passage tombs are covered with a cairn, especially those Passage tombs of the cairn type often have elaborate Corbel arch rather than simple slabs. Prehistoric art has been identified carved into the stones at some sites. Not all passage "graves" have been found to contain evidence that they were used for burial. One such example is Maeshowe.
In a 1961 survey of megalithic tombs in Ireland, Irish scholars Seán Ó Nualláin and Rúaidhrí de Valera describe four categories of megalithic tombs: , portal , wedge-shaped gallery graves, and passage tombs. This appears to be one of the first uses of the term. It is likely that the writers borrowed from the Spanish term tumbas de corredor, "corridor tombs", which is used for tombs in Cantabria, Galicia and the Basque Country. Of the megalithic tombs in Ireland, only passage tombs appear to have widespread distribution throughout Europe.
Passage graves are distributed extensively in lands along the Atlantic seaboard of Europe. They are found in Ireland, Great Britain, Scandinavia, northern Germany and the Drenthe area of the Netherlands. They are also found in Iberia, some parts of the Mediterranean, and along the northern coast of Africa. In Ireland and Britain, passage tombs are often found in large clusters, giving rise to the term passage tomb cemeteries.
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