“There’s a series of ancient scrub systems. These are relic sand dunes left from times of much higher sea level. And the oldest and most ancient of these is a relic sand dune that runs down the middle of Florida, essentially about 150 miles… Orlando, due south.” “That ancient sand dune, still exists today as part of a near-desert environment in the middle of the state”…

The reseach was done by Kevin Pierce with the Florida Environment.

Check out the website
http://www.floridaenvironment.com/programs/fe00828.htm