Cruciform passage graves describe a complex example of prehistoric passage grave found in Ireland, west Wales and Orkney and built during the later Neolithic, from around 3500 BC and later.
They are distinguished by a long passage leading to a central chamber with a corbelled roof. From this, burial chambers extend in three directions, giving the overall impression in plan of a cross shape layout. Some examples have further sub-chambers leading off the three original chambers. The network of chambers is covered by a cairn and revetted with a kerb.
A common trait is megalithic art carved into the stones of the chambers' walls and roofs. Abstract designs were favoured, especially spirals and zig-zags.
PassageGraves, with a distribution covering the Channel Islands and Brittany, with a particular concentration in the department of Morbihan in southern Brittany.
Note that access to the whole of the passagegrave would be required for the dimensions and position of the chamber to have been taken into account during the planning of the chapel, access to the short length of passage in front of the roof fall found in 1924 would not provide this information.
The roof fall in the passage and the fall of the entrance lintel resulting from the removal of the northern support stone would both deny access to the passagegrave chamber, so both of these would need to occur in or after the 12th century for entry to the entire structure to be possible then.
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