http://www.northwestgeorgianews.com/sports/national/gainesville-s-greatest-landmark-a--million-year-old-rock/article_3701f78f-cd74-5a0a-a342-be92a1a68c54.html

It's from the Oligocene Epoch. Of course it is.

Sandwiched between the Eocene and Miocene eras some 30 million years ago, the Oligocene is the sort of geologic period that gets memorized in the moments before and forgotten quickly after an earth science exam.