14,500 would put this before the time period described in the book at Comment #2 (a good read by the way). This event which probably occurred 2,000 years later may have caused a major die-off of very large mammals as well as humans. Florida was much bigger in those days as the ice caps were still in the process of melting. What is now everglades could have been grassy plains. A young friend has sold property in Miami and bought around Orlando since they fear that by the time their grandchildren inherit, Miami will be underwater. The link below shows various sizes of Florida. The second map, first row shows the outline of Florida 20,000ya with a dashed red line. The shrunken white Florida is ancient, but also reflects Florida with raised sea levels. The green and yellow map on the sixth row also shows ancient and modern borders. As you can see the ancient area is at least twice the modern area so areas now swamp would not be then.
Thanks glee’.