I also now think it is possible that the archaeological dates....
You might find the comments of David Tarler interesting in this regard.
In 1997, the JW's published an article entitled, Jerusalem in Bible Times, What Does Archaeology Reveal? which mentioned both David Tarler and Jane Cahill by name.
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This was Tarler's response: (via email)
I am not familiar with the article you cited - and I would appreciate receiving a copy of it - but I never said that the Babylonians destroyed Jerusalem in 607 B.C.E. I do not think that, today, archeologists could differentiate between 607 B.C.E. and 587 B.C.E. material cultural remains. Assuming that there are material remains from a 604 B.C.E. destruction at Tel Miqne/Ekron and from a 587 B.C.E. destruction at the City of David/Jerusalem, comprehensive analysis of these remains conceivably could yield chronological indicators for other sites, but even then, the archeological conclusions would derive from those assumed dates; the dates themselves would not derive from the archeology.
David Tarler
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This was Jane Cahill's response: (Also via email)
No, I have no idea what this guy is talking about. I have never heard of the Watchtower Society, I have never published anything suggesting that Jerusalem was destroyed in 607 BCE, and - as far as I know - Yigal never published anything like that either. I would respond that I know of no evidence supporting such a date. Hope that answers your query.
Take care!
Jane Cahill