Today we concentrated on the southern quad. of the trench. We started w/ locus 14, and passed through a very dark soil level followed by another tan/yellow level. Then changed to locus 17 in this quad, marked by what looks like construction fill. Very rocky. We then started locus 18 in this quad because of yet another tan/yellow surface. Ephemeral. Elsewhere in the trench, we are running out of room. No room in 11. We brought 15 and 16 down, until we encountered more boulders. Most of my workers worked on the backdirt pile today, so that we can expand the trench.