ST1: After several days away back again. Cleaning locus 11 down in main part of trench, as well as continuing down north of the northern wall and south of the southern wall. Also cleaning the small cobbles in the southern wall in order to define which are wall (if any) and which are tumble.
All of this done, we'd be ready for a photograph but it's too cloudy so cleaned everything and will photo first thing tomorrow.
After that we will continue down between the two walls. ATS suspects we're near bedrock, RB just pointed out an intriguing line of rocks coming off at an odd angle from the northern wall. We'll see tomorrow.