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Unchambered long cairns (sometimes alsochamberless long cairns) are found in Scotland andNorthern England, and form a group of non- or semi-megalithic monuments. There are about 28 long cairns in north Scotland and 21 in south Scotland that show no evidence of internal stone chambers. However, proving the existence of wooden chambers under acairn is not possible without excavation work. The exact classification of this group of monuments is therefore not easy. Three particularly noteworthy examples of these cairns are:
All have narrow rectangular chambers whose positions are marked by wooden posts. The last two are especially interesting, because stone chambers were built into the mound at a later date. These make the connexions and overlaps of ideas clearly visible, something which can otherwise only be imagined from their classification by type.
Although none of the northern cairns has been excavated, their existence is significant for the architectural history of Scotland. The north is a region wherepassage tombs in circular cairns are especially common (theOrkney-Cromarty type). Sites that span several periods of time, such asTulach an t'Sionnaich, demonstrate that both forms were used by the same communities. Several round cairns, like those ofCamster had long cairns built over them, so that the round mound here retains its older shape. Many chamberless cairns and those with stone chambers have concave forecourts which are reminiscent of those that had been built earlier of wood (Haddenham andStreet House) inYorkshire.
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