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"Sea level has risen, but more like 300 feet than 2000 feet. If this is a city, it must have sunk 1700 feet or so, which is unusual."

Could the Gulf Of Mexico have been isolated for a while like the Black Sea? Partial dessication? Food for thought.

Could the Gulf Of Mexico have been isolated for a while like the Black Sea?

If you look at the Caribbean area on a map, it might look possible the islands to the east formed a blocking chain to the sea when sea level was lower. There would have been plenty of shallow areas and a lot more of it was open land. Some of the rivers that feed it would have carried a lot less water, especially the Mississippi due to the glaciation to the north. Maybe it dried out so they could build cities even below sea level of the time. This hypothesis would add a lot to Noah's Flood, especially since the area is much greater than the Black Sea. 5X or so.

I remember reading somewhere that the Antilles and Lesser Antilles are all basically continental chunks. They may have subsided to a very large degree. I know that there have been wildly fluctuating sea levels. In the Dominican Republic, you can see an old shoreline that is some 50 to 75 feet higher than the present one. Either worldwide the sea level was that much higher or that there has been elevation of this island or some variation of the two. I also recall reading that during the last ice age the sea levels were much lower than now. With an increase in water as the ice age passed, the shoreline would not only rise due to higher water levels, but to subsidence caused by the weight of the water itself. If the change from ice age to a warmer climate was sufficiently rapid, the global redistribution of mass from ice to water could have had severe effects on the balance of geological forces.