Section of interior wall of circular structure N of tufo paving 4055. After cuts on E and W, continues S as walls 4053 (on W) and 4060 (on E). Does not appear to be cut on N by construction cut 4049 for later wall 4061, though exterior wall 4050 is cut here. Function of circular structure still uncertain.
Northern semicircular walls 4050 outside 4051 inside