Mostly silty accumulation layer that appeared in rooms 2 and 3 from the north underneath SU 0 (including directly underneath where backhoe dug). Stretched over separation wall (4007) to cover both rooms (though less thick in room 3). SU originally covered only the area of the second room from north, but was extended on second day of excavation into third room and over surface of road up to ridge down middle of road left by excavation of Area C in 2009 and 2010. Layer very similar to SU 0 and probably represents the remains of the topsoil and a mixed accumulation layer. Underneath 4005 we found new layers in the second and third rooms and in the area of the road (4004, 4015, 4016).