This is the last of the dark brown, silty matrix that is clinging to the center of the room. At the end, Locus 19 was 8.65 m on its SW side, and 8.45 m on its NE side. It was 2.9 m on its SE side and 2.8 m on its NW side, but 2.6 m across in its center (it was slightly hour-glass shaped, running along the SW side of the trench).