This is an erosion of the layer of stones (SU 2075 and SU 2082) that covered the glariate road surface (SU 2093) which also eroded a section of the eastern retaining wall of the road (SU 2080) and part of the road surface itself. A few large stones dislocated from the wall by this erosion are visible immediately to the east. At some point this erosion was filled by layer SU 2092, and this fill, along with the stones to north and south and walls to east and west (SU 2080 and SU 2081) were all covered by a layer of silt (SU 2073).