Linear spread of unworked fragments of tufo and basalt and largish fragments of tile in the central part of the E side of the house in Area A, S of wall SU420 and N of a similar spread of tiles and stones (SU572) which may be a part of the same feature. Most likely the fill of a foundation trench (no cut visible) possibly for a S part of wall SU420 which is not preserved. On a line just W of wall SU420. Appears similar to layers SU574 and SU575 on the W side of the house.