May be of Hellenistic origin when cistern system went out of use.
For a general note on the cistern see Nb. ΟΕ III, pp. 246 ff.
Objects from B 586 various depths (no subdivision): S 2324-S 2330,
P 34894, ... Late 2nd-early 6th c. A.D.
Filling of a well on the lower north slopes of the Areopagus, dug early in the 1st c. B.C. [construction fill]; in use into the the 2nd c. A.D.[well fill] (H Ms.) No apparent stratification.
Hellenistic ... 2nd c. A.D.