Excavations in 2023 revealed the continuation of this SU (21056). The tiles and stones are laid flat in the manner of a surface, not a collapse. The tiles cover 21066 and may indicate that 21066 is actually a preparation layer for this surface - perhaps a layer of mortar to help secure the tiles. The tile surface abuts wall 21003 and 21037 and may be external (?), which allows us to say that the walls of Room c were visible at the same time that these northern walls were in use, but does not allow us to phase their construction together with certainty. 21054 (concentration of tiles over surface 21056=21034) may be displaced tile surface pulled up by plough activity, and so should then be equalized with 21056 = 21034. Note that these displaced tiles appear to be in alignment with a break in the back wall. A preserved patch of compact mortar and soil abutting the western face of 21053 may equaly 21066 but this deposit and wall were unexcavated and so it is difficult to phase with certainty.

Tiles and stones collapse. CB