Roughly circular pile of irregular, unworked tufo stones on top of the lower fill (SU425) of a possibly square cut (SU418), covered by a reddish-orange deposit (SU415). The stones are of uncertain function, but may be part of a tree-planting system. The composition of the stones with reddish-orange soil above is very similar to that in the 'hut' of 2009 in Area A.