“It was not until 2014, more than two decades after the mastodon's discovery [a mastodon scavenged by humans in the Americas], that the tide decisively turned. Built on improved understanding of processes that incorporate natural uranium and its decay products in fossil bone, a newly enhanced technique, known as 230 Th/U radiometric dating, was now available that could settle the age of the Cerutti deposit once and for all. Deméré therefore sent several of the mastodon bones to the US Geological Survey in Colorado, where geologist Jim Paces, using the updated and refined technique, established beyond reasonable doubt that the bones were buried 130,000 years ago.”