Irish wedge tombs are sub rectangular.
The cairns of court tombs were manily trapezoidal.
The dual court tomb at Audleystown (Co. Down) is in a rectangular cairn with drystone wall revetments. Most of the double CTs would have been in rectangular cairns.
Wayland's had/has a trapezoidal cairn , as did many of the long barrows.
I am not at all sure, but I think a recangular/square structure was found beneath the centre court tomb at Ballyglass in Co. Mayo.
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