According to the excavator " a pre-herulian filling dumped in to fill the cistern some few years after the Herulian destruction". Coins:
10 June 1936 #2-#6
11 June 1936 #1-#19
12 June 1936 #23-#27 P 11936 ... A.D. 267 to mid 3rd c.
Use filling of middle of 1st to late 6th c. (Roman Group M); dumped filling of 9th and 10th c. Down to a depth of about 21.00m. the fill of the well contained very few objects, the latest of them being ... 1st-6th c. A.D.