The discovery of stone tools from the late Pleistocene (13,000 years ago) within the city limits of Boulder in 2008 was a rare event in archaeology. A new exhibit in the University of Colorado’s Museum of Natural History in Boulder features the collection of more than 80 of these stone tools known as The Mahaffy Cache found in a backyard.
http://www.stone-ideas.com/2015/10/18/stone-tools-about-13000-years-old-tell-stories-of-late-pleistocene/
