Fossil treasure trove discovered at Silicon Valley construction site

July 7, 2014 1:25 PM

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In heavy boots and a hard hat, paleontologist Jim Walker ambled down a rocky slope and stopped.

"Look here," he said, pointing to a shiny black shape in the sandstone. "This is one of its incisor teeth. They had short legs and a snout, kind of like a hippo or a manatee."

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