13,000-Year-Old Stone Tool Cache in Colorado Shows Evidence ...     A biochemical analysis of a rare Clovis-era stone tool cache recently unearthed in the city limits of Boulder, Colo., indicates some of the implements were used to butcher ice-age camels and horses that roamed North America until their extinction about 13,000 years ago, according to a University of Colorado at Boulder study.     http://www.colorado.edu/news/r/1124c0243883c267a7759da4bc4a2...     tags: Mahaffy caveman CU-Boulder News Photos | Photo Database | University of Colo...     Douglas Bamforth, Anthropology professor for the University of Colorado at Boulder places his hand one of more than 80 artfiacts unearthed about two feet below Boulder resident Patrick Mahaffy's front yard during a landscaping project this past summer. The artifacts, which may have been made during the Clovis period nearly 13,000 years ago, were neatly arranged in a cache near where this portrait was taken, suggesting that the users of these instruments may have intended to reuse them.     http://photography.colorado.edu/netpub/server.np?find&catalo...     tags: caveman