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With that same thought in mind, I'm beginning to wonder if the Gulf Of Mexico became fresh water at one time.

I've speculated before, on other threads, that the Gulf Of Mexico may have been blocked (to the world's oceans) from the Yucatan across Cuba and to Florida and had dessicated to low water levels during the Ice Age. This surge of fresh water may have flooded the Gulf Of Mexico and broke the 'dams'.

Well, there does appear to be a submerged ridge under the Yucatan Channel and Florida Straits.

http://images.google.com/imgres?imgurl=http://walrus.wr.usgs.gov/infobank/gazette/jpg/regions/fr_gm.jpg&imgrefurl=http://walrus.wr.usgs.gov/infobank/gazette/html/regions/gm.html&h=1832&w=2375&sz=1184&hl=en&start=9&tbnid=HcfnE04UTSP64M:&tbnh=116&tbnw=150&prev=/images%3Fq%3D%2Bsite:walrus.wr.usgs.gov%2Bgulf%2Bof%2Bmexico%2Bmap%26ndsp%3D20%26svnum%3D10%26hl%3Den%26lr%3D%26safe%3Doff%26rls%3DGGLG,GGLG:2005-45,GGLG:en