A site containing the 220-million-year-old fossilised remains of nearly a dozen dinosaurs has been discovered in western Argentina, researchers said Wednesday. “There are almost ten different individuals, it’s a mass of bones, there’s practically no sediment,” said Argentinian paleontologist Ricardo Martinez. “It’s very impressive.” According to Martinez, of the University of San Juan, the fossils are approximately 220 million years old, belonging to “an era of which we know little”.