"I wonder what the effect would have been at Windover? I believe that culture was contemporary to the Agassiz event." I don't know...that crossed my mind too.
I have some 7,000 year old wood from a coastal forest that went underwater in NW Florida (Santa Rosa Sound) about 7,000 years ago. I suspect there were a number of 'floods' like this one in a number of, still unidentified, places in the world.
Another nail in the coffin of the gradualism theory of climatic and geomorphic change. Aside from the inconsistency of the "Solar Constant", its hard to see any mechanisms for slow changes in climate such as we are now experiencing. Certainly, the "evil capitalism did it" theory won't survive the currently popular hysteria and political expediency.