The M & M mastodont is one of only a few described specimens of Mammut americanum in Arizona. This contrasts to the large number of sites reporting mammoth remains. The preserved remains of the mastodont indicate it was a large male, but not an aged adult. Radiocarbon dates associated with the mastodont reveal a late Pleistocene (Rancholabrean) age for the mastodont. Previous pollen studies from the M & M mastodont show a transition from the Clovis-aged Drought to a more mesic environment.