Today began warm and sunny, with only a dry breeze. We worked only a half day, due to the party tonight. We worked exclusively in WSDB today, first in the extension (locus 10) and then also cleaning the wall along the NE baulk. The locus of dirt and material on and in the wall is Locus 11. We closed the general extension locus 10 and opened 12 in the N corner, extending westward to the large rock 2 meters from the N corner, in the NW baulk. Between that large rock and the next large rock to the west is locus 13. The pile of rocks in Locus 13 is puzzling, and will likely require another extension to explore it.