http://www.newsweek.com/this-ancient-saber-tooth-creature-first-cat-like-predator-us-1687785

Paleontologists have discovered a fossil belonging to an ancient saber-toothed creature that is thought to be the first cat-like predator to ever exist in the U.S.

The fossil, found at the Santiago Formation in southern California, belonged to a Diegoaelurus vanvalkenburghae–a bobcat-sized carnivore that lived around 42 million years ago. It had long upper teeth and a bony chin and was unlike any mammal that had come before it.