Collapse material from destruction event that fell into the container sunken in the floor (SU 20049), which was only partially filled at the time of the collapse. Therefore should be equalized with collapse layers above (SU 20039, etc.) (KG) I would keep 20050 separate from 20039, as it was clearly within the boundary of the container, although agree that it is part of the same collapse event as the SU covering it. (RGV)