Wow, that’s fascinating!
What did you do with it?
I formed it into interesting hand size pieces and took confirming documents (from the U of Florida) to a print shop along with a list of the major things in history that had occurred in the past 7,000 years....laminated that detailing sheet and connected it to each piece of wood with a small gold chain and gave them away as Christmas presents.
The Ice Age ended in three major spurts, the last spurt was about 7,000 years ago and this Florida forest went underwater then. Everything has been pretty much the same since then. I think the last 'spurt' may have been Noah's Flood too.
If you like this sort of 'stuff', you'll probably like this: Sundaland