Probably from an earlier phase of the walls and later incorporated into walls of room I-4. The strange cut and orientation which differs from that of the walls to the north suggests that it belongs to an earlier phase.
Room I-4
Taken from the west.
N-S wall (E) of Room I-11, S. of wall 8011; N-S wall (E.) of Room I-11, S. of wall 8011; N-S wall west of Room I-2; E-W wall (E) of Room I-12, E. of wall 8016; Degraded tufo ashlar north of su 8076; N-S wall N. of 8076 and S. of 8016, in E. half of Room I-12
Series of N-S running walls at eastern end of 2018 excavation area
Degraded tufo ashlar north of su 8076