It started like this: a bloc of clay.
Then, when sectioned, a rock appeared. The clay was coating the rock.
When we went deep in the excavation, the rock continued, circular and coated by the clay. It looks like a bedrock column, like others known in large pits or Mediterranean hypogea. Because the rock is strongly weathered the coating with clay was a solution to avoid degradation (that occur once we did the section in the clay).
The excavation of pit 80 is already quite deep. The presence of the possible column suggests it may get a lot deeper. And makes us wondering...
Meanwhile, in the other pit botanic remains (possibly of linum) keep growing.