The SU is a layer of accumulation related to either leveling or post-abandonment activity in the Area C house courtyard. During post-excavation study, this feature was reinterpreted as a potentially early leveling fill regularizing the topography of the central area of Space 1A-7 and leading into Space 1A-1.
The SU is a layer of accumulation.
Silty gray brown deposition SE part of courtyard