A crushed tufo floor surface associated with the floor prep surface SU 6258 and underneath an ashy deposit SU 6262, above the bedrock. This is a very similar set of associations to a small section of crushed tufo floor in the northern part of the room that is under ashy deposit SU 6196. As this northern tufo could only be seen in section it was not given its own SU number, the similarities between that area and the current SU 6259 are of note.