Well at 89-90/ΙΗ-ΙΘ (diameter at top 1.10m), between the southeast corner over the mouth of of the Odeion and the Panathenaic Way. The well lay a thin layer of dug bedrock containing a few Hellenistic ... 650-625 B.C ... Carefully dug with a series of eleven steps 0.50m apart on one side of the shaft, ending 1.00m above the bottom.