Further study indicated that this layer was one of a series of preparation levels which had the function of leveling the ground to make it suitable for the new building.
Natural deposit (probably colluvial) on a slightly higher level than SU390 with a sharp ledge on the east that was left by the backhoe. This layer is equal to the one below and to the east of it (SU390) but was excavated separately to investigate the dating of the finds. The quarry cut (SU386) cuts this layer. Experimental sampling with 6mm and 2mm sieves