Luminescence dating reveals South Dakota's Mammoth Site is over 100,000 years older

Beneath the plains of South Dakota, time has been quietly holding a secret far older than science had reckoned. New luminescence dating of the Mammoth Site — a prehistoric sinkhole that entombed dozens of Ice Age giants — has pushed its origins back more than 100,000 years beyond prior estimates, fundamentally altering the known timeline of mammoth presence in North America. In measuring light trapped within ancient mineral grains, researchers have found not just a corrected date, but a reminder that the deep past is rarely as settled as we believe.