Thirteen millennia ago, in a small creek valley in western South Dakota, two mammoths perished. The mammoths, an adult and a juvenile, likely a cow and calf pair, died at the edge of an ancient pond.The Lange/Ferguson site is the earliest dated archaeological site in South Dakota and one of the few North American sites that provides evidence of a Clovis-period mammoth butchering event. In addition to the preserved remains of the two mammoths, the site yielded diagnostic Clovis weap...