While it is clear that this is related to a surface of some kind (extending E. under wall 2245), it is unclear exactly what type of surface this was or what this surface was associated with. The surface does not extend N. or S. and it appears to have been truncated in the leveling Room C1 for one of the later house phases.
Part of a compact surface of crushed yellow tufo extending to N and E (SU in same layer as 2569), and runs beneath Wall 2245
Crushed yellow tufo W. of wall 2245