Basalt rubble wall running NW-SE parallel to wall SU363 (= wall SU1058 in Area B). West edge of wall is in the baulk in Area A and not visible in 2010; only top of wall visible at this time. Construction material appears to be primarily large unworked basalt stones with rare chunks of gray tufo; no visible binding agent. In Area A, the space between this wall and wall SU363 appears to be packed with rubble. NOT MAPPED or fully exposed, etc in 2010; only working photos and working sketch taken.