On the other hand, the salt layers in the Gulf of Mexico, onshore Texas, Louisinana, Arkansas, and Mexico date back into the Jurassic. They may very well be related to similar salt layers in the North Sea and Germany (called the Zechstein). These were deposited when the continents were in a greatly different configuration, and may record the opening of the proto-Atlantic Ocean (in plate tectonic theory). There is no good evidence to suggest that the Gulf of Mexico, as we know it today, was ever devoid of water.
Another possibility to consider when talking about global climate changes, and/or ocean circulation changes, is the development of the Isthumus at Panama, connecting North and South America, and cutting of the Atlantic and Pacific Oceans at the middle latitudes.
Very good input. About the Gulf Of Mexico, I was thinking of a partial water level lowering, not a complete drying. I developed that idea while trying to explain how a city ( as yet unverified ) could be 2,100 feet underwater off the coast of Cuba. (It was built on the shore of a reduced water level Gulf?)
