/tags/pekin-formation Pekin Formation en-US Copyright Thu, 19 Mar 2015 16:53:49 GMT /science-technology/2015-03-19/the-newly-discovered-carolina-butcher-stood-at-the-top-of-the-food-chain North Carolina State University researchers have identified a new species that might have been the top predator in North America before the dinosaurs. The… Thu, 19 Mar 2015 16:53:49 GMT /science-technology/2015-03-19/the-newly-discovered-carolina-butcher-stood-at-the-top-of-the-food-chain Rebecca Martinez