The wall SU 5441 fills the gap between two large tufo blocks (SU 5442 and SU 5444). The tufo blocks are earlier than the concrete fill layer but it's not certain if there was an original space or if a block had been robbed out. Similar structure to the east side, but SU 5441 is so degraded that it is hard to compare features. The parallel feature is SU 5439.
Piers and threshold blocks in the very south of of area Fdu