Mosaic floor built into trapezoidal structure which overlays the western half of the piazza. Mosaic floor seems later than wall 7327 and possibly in phase with the construction of the wall 7311. Threshold stone 7314 seems to be in phase with the use of the mosaic and possibly delimits the northern end of the SU. Western portion cut in later period by 7206. Unknown reason why Northern and Eastern sides have eroded.