Section of interior wall of circular structure N of tufo paving 4055. After cuts on N and S continues as walls 4051 (on N) and 4060 (on E). Abutted by exterior wall 4052 on W--4053 may be an earlier phase of the circular structure. Covers 4054, which also extends under wall 4060 to the E. Function of circular structure uncertain. Abutted on W by ashy layer 4045.
Southern semicircular walls 4052 outside 4053 inside