In Treehugger: Undisturbed, Prehistoric Sand Dune Discovered at Michigan State University.
I specifically object to "Prehistoric"--it's too broad. I live in the watershed of the pre-historic Potomac River. I've forgotten most of my geology, but it almost sounds as if the dune might qualify for this headline: "Sand Dune at MSU Survived Last Glacier, and Man". If it really is a sand "dune", that to me implies it was created by wind. It could be a sand "bar", created by water during the ice age.