See post 75,76 and 77.
Do you have an estimated date for the destruction of Sodom and Gamorrah? I have read several potential causes (some probably fantastic) including an enormous natural gas explosion. The area was supposedly at one time endowed with oil that was consumed and the seeps sealed in that explosion. Israel has drilled exploratory wells in the area and come up dry.
We were (and are) still coming off the same Ice Age. May well have been more than one flood.
For example, The Columbia river in the west which passes through Portland had multiple MASSIVE floods in it's history. Each easily flooded the entire Willamette valley and much of the NW Columbia basin while ripping out what is now the Columbia river route.