Many thanks to all for your interest - clearly the evidence
that a rise from 100 BC at approx minus 1.00m to plus 0.80m
in 300 AD [present Med. sealevel] is "mounting" and possibly
at the height of the Greek and Phoenician civilisations the
sea level may have been even lower.
 
The salt making pans at any time were extremely sensitive
to changes, and relied entirely on the small Mediterranean
tide to fill the pans for each evaporation cycle. [no pumps!]
and there are very few areas that happen to be expansive
and flat, and precisely at sealevel.
 
As the pans flooded, the search for salt turned inland
to difficult rock mining, although areas viz. Ravenna and
Aquilea, previously 10 km inland became available and also
turned into florishing ports. [today again high and dry]
 
Ceasaria became the main export port for rock salt Mount Sedom
at the Dead Sea, and "legions" were forced to free supplies from
the Jewish "rebels" [who controlled the route thru Jerusalem]
atop of Masada, in a long three year campaign!
         [Specific reply to: Norman Hirsch]
 
Since archeology of salt production is non existent [dissolves]
the only correlation can be the ports, which were built and
re-laid corresponding to the sealevel, and although there must
have been tectonic movement,  buildings and replacements
could not have remained so vertically preserved  and I
should be grateful for any more examples of building so
preserved [above and below sea level] during the "period"
         [specific reply to Wilma Stern -Jan Theo Bakker]
 
Secondly [with salt in mind] I am looking for evidence of
Roman mining for salt, [the classic ..HAL..sites, Chester,
the Dead Sea etc are obvious, ]  mining tools, organisation,
transport, of salt imported to Rome.  This precludes a concept
that Rome specifically searched for salt [via salarius]
 
Extra-curricular Comment:
We think the changing Albedo of the Antarctic ice cap due
to sudden colouring by volcanic ash is  the
reason for sudden glacial melting, [Bloch M.R. 1968]
[climatic changes too eg. Manitubu?]
and  if true, this would throw the ozone layer theory out
of the window. [a red herring?]
I will reply to specific persons in due course - thank you
Due to requests - I suggest replies thru: HISTARCH
[log in to unmask]