A remarkable new species of meat-eating dinosaur, Allosaurus jimmadseni, was unveiled at the Natural History Museum of Utah. The huge carnivore inhabited the flood plains of western North America during the Late Jurassic Period, between 157-152 million years ago, making it the geologically oldest species of Allosaurus, predating the more well-known state fossil of Utah, Allosaurus fragilis.
Source: New species of Allosaurus discovered in Utah | EurekAlert! Science News