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| navigate by keyword : america animal background big carnivorous claws creature dangerous dino dinosaur dinosauria extinct extinction fossil frenguellisaurus gigantic grand head herrera herrerasaurus hunter ischigualastensis ischisaurus isolated jurassic ladinian large lizard meateating model monster paleontology patagonia period powerful predator prehistoric reptile restoration scary south stare trex teeth terrible theropoda triassic tyrannosaurus white |
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| Herrerasaurus was one of the earliest dinosaurs. Its name means Herrera's lizard, after the rancher who discovered the first specimen. All known fossils of this carnivorous dinosaur have been discovered in rocks of late Ladinian age (middle Triassic dated to 231.4 million years ago) in northwestern Argentina. |
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