Georgia Journal of Science
Fossils of Mammut americanum, the American Mastodont, have been recovered from a stream in the Chattahoochee River drainage basin. These fossils imply that at least some local stream terraces are of Pleistocene age.
Schwimmer, David R., "First mastodont remains from the Chattahoochee River valley in western Georgia, with implications for the age of adjacent stream terraces" (1991). Faculty Bibliography. 465.