North America, Morrison Formation
Ceratosaurus nasicornis was a formidable predator that stalked the forests of the Late Jurassic Morrison formation. Growing to lengths of six metres, it was smaller and somewhat scarcer in the fossil record than its contemporary, Allosaurus, and possibly favoured a different environment and lifestyle from the larger carnivore. Unusually for a theropod dinosaur Ceratosaurus possessed a bony nasal horn that it may have used in jousting matches with rivals of its own species, or more likely as a form of sexual display.
Sphenodonts are today confined to one species, the Tuatara from New Zealand, but during the Mesozoic era they were widespread. Similar to lizards in general appearance and body plan they were in fact part of a different family of animals.
Araucarias are primitive coniferous trees. Once abundant in the Mesozoic, they are now confined to a few species native to the southern hemisphere.
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