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Related to Portal dolmen: portal tomb, Hunebed
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The authors conclude that there are indeed clear differences between the landscape settings of portal dolmens, Severn-Cotswold long barrows, passage tombs (by which they are principally referring to the north Welsh examples with megalithic carvings) and the earth-fast sites of south-west Wales.
We should remember that virtually by definition, portal dolmen capstones are usually tilted, and long cairns tend to slope from large end to smaller end.
Archaeologists say as well as being a portal dolmen - a tomb made of giant stones - the standing stone was probably used as a ritual marker to guide communities through a "sacred landscape".