Ryan and Pittman say that there are serious scowering marks in the bottom at Gibralter where the 'dam' droke and allowed the refilling of the Mediterranaean after the Ice Age. Then eventually the Black Sea also 're-filled' because it had dried about 500 feet from the level of the entrance to the Mediterranean...a giant salt-water, water fall.
Even if not drying out, the sealevel everywhere was considerably different.
http://www.freerepublic.com/focus/news/1520028/posts?page=93#93
http://www.freerepublic.com/focus/chat/2170733/posts?page=28#28
While it may have been much drier 4 million ya, it is also likely to have been fairly dried out after 100,000 years of ice age evaporation. Probably had brackish swamps, salt deserts, islands, ponds and small seas. With the sea level 400 feet lower at the end of the ice age, it must have been some huge event when the ocean began to flow back through Gibralter as sea levels rose. Archeologists are only beginning to recognize the need for underwater exploration for drowned civilizations. The Greek historian H??? mentioned Egyptian priests speaking of events 9,000 years earlier which would have been at the beginning of the Younger Dryas cooling. Between Dryas cooling and Mediterranean flooding existing advanced cultures would have been seriously set back, especially as many of them would have been on sea coasts and river mouths.
If the Younger Dryas was precipitated by giant boloid strikes about 12,000 ya, there may also have been great Atlantic tsunamis which could have begun the Gibralter overflow. I too think the Noah flooding was probably caused by the sudden filling of the Black Sea at a much later date.
I’ve got that book! A good read, and the facts supporting it are helping to re-write that period of history predating the Bronze Age. Or whatever.