After study, this SU is tentatively associated with a series of cuts and fills in close proximity: SUs 334 (Fill SUs 121, 329, 332), 336 (Fill SU 335) 118 (Fills SUs 109 (packing), 119), 518 (Fill SU 517). This depression with its halo of further cuts might possibly be interpreted as a large posthole re-done many times.

Layer of tufo, rocks and soil in a rectangular cut. The same layer appears to fill the cut north of this cut which intersects or is cut by the possible drainage trench