Today we took down AC3, defining further loci. Locus 2 is an area of crumbly sand and cement in the east trench, comparable to the contexts of collapsed architecture in the other operations. Locus 3 is a context of darker, stonier soil between locus 2 and the western caravanserai wall (locus 4). we completely removed locus 1 today (topsoil). started to take down AC4, but will wait till tomorrow, with picks.