Further excavation suggests that it is not redeposited natural soil, but actual natural non-anthropic levels.
Layer of accumulation likely related to leveling or re-leveling of this part of the courtyard. Beneath is a deposit of what looks like (potentially) redeposited natural soil suggesting that this represents an anthropic horizon sitting on top of either natural soil or a phase of signifiant landscape modification in this area.
Layer of accumulation
Friable, light brown, northeast corner of courtyard