“In the last ice age, between about 10,000 and 13,000 years ago, the water level was 90 feet lower then than it is today,”
Wrong.
The sea level 15,000 years ago was 400-300 feet lower than today. The Caribbean, Gulf of Mexico, and Florida coastlines would be radically different than today’s coastlines.
About 13,500 years ago a location where Lake Superior exists today was hit by a bolide causing the ice sheet to melt catastrophically. A huge flood of fresh water flowed northerly from today’s Hudson Bay, and also down the present St. Lawrence seaway, resulting in a resurgence of cold temperatures and expanding ice sheets. The sea levels once again dropped.
In another part of the world, it wasn’t until 8000 years ago that the Persian Gulf/Arabian Gulf began to be flooded by the sea.
The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization
by Richard Firestone,
Allen West, and
Simon Warwick-Smith
http://www.johnstonsarchive.net/spaceart/earthicemap.jpg
http://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Elevation.jpg/800px-Elevation.jpg
http://upload.wikimedia.org/wikipedia/commons/e/e4/Last_glacial_vegetation_map.png