This SU constitutes a small portion of the remains of the early pavement surface of the road (or at least the walkway under the colonnade). It can be seen extending under the basalt road and its southern limit is unknown. Similar surfaces can be seen extending from the western most end of SU 5460 until SU 5416 and from the south of SU 5469 until at last the basalt road. Similar blocks can also be seen in the ramp in area 10, specifically SU 5466. Some of these slabs to be recorded in 2014.