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A long barrow is a prehistoric monument dating to the Neolithic period. They are rectangular or trapezoidal earth mounds ranging in length from 15 to 125 metres and survive to heights of up to 5 metres.
There is a concentration of the monuments in southern and eastern England. Elsewhere in the British Isles Neolithic people buried their dead in Megalithic tombs
Archaeological excavation indicated that the construction of the earth barrow was the last phase in a complex sequence connected with the ritual inhumation of the dead between 4000 and around 2400 BC. Many long barrow sites started off as enclosures of earth banks topped by a timber palisade, constituting a mortuary enclosure. Sometimes a grand stone or timber entrance was also built. Human remains were placed in this enclosure, sometimes all at once and sometimes over a period of time. Often the bones found in them are disarticulated, implying that the bodies were subjected to exposure and excarnation prior to burial or that they were buried elsewhere and exhumed for the purposes of placing in the barrow. Rarely are whole skeletons found and it seems that only long bones and skulls survived until the final interrment. Up to fifty separate individuals were placed in each enclosure, males, females and children. There is only limited evidence for grave goods in these collective interments. The enclosures were then surrounded and covered by large stone cairns or wooden chambers which were set alight in the case of examples in Yorkshire. A subgroup of chambered long barrows contain stone burial chambers, constructed from slabs, which appears to come from a different tradition.
Only after these procedures was the earth barrow constructed over the top of the dead. The barrow was often far larger than the original mortuary enclosure and used material excavated from an encircling ditch. A retaining wall or kerb was sometimes built up against the barrow.
In some cases, weathering during the invervening centuries and early archaeological excavations and looting have left only the stone parts of the monuments extant.
It has been conjectured that long barrows are derived from the timber long houses built by the continental Neolithic European Linearbandkeramic culture which was contemporary with the British Mesolithic. Archaeologists including Ian Hodder have noted similarities between the two forms although a significant number of long mounds in southern England have been demonstrated more recently to have limited primary evidence of burial at all. Traditionally, these structures have been interpreted as 'houses' for the dead and that barrow builders may have continued this old idea in the Neolithic and later periods. In those long barrows that do contain appreciable quantities of human remains, their concentration in just one small part of the overall structure has led some to argue that the long barrow was not merely a repository for the dead but also a general monument acting as a territorial marker, a place of religious offering and a community centre. Chambered long barrows however do appear to have been primarily intended as burial sites.
Examples of long barrows include Hazelton North in Gloucestershire, Fussell's Lodge and West Kennet Long Barrow in Wiltshire, Foulmere Fen long barrow in Cambridgeshire, Coldrum Stones in Kent and Street House near Loftus in West Yorkshire.