The Jurassic period was the middle of the three periods into which we divide the Mesozoic Era (the previous period being the Triassic period, and the next period being the Cretaceous period), and occured between 213 million and 144 million years ago.
During the entire Jurassic period, dinosaurs were the dominant land animals, and many of the more familiar types of dinosaurs appeared including Allosaurus, Apatosaurus, Brachiosaurus, Ceratosaurus, Diplodocus, Kentrosaurus and Stegosaurus. Additionally, the first birds (which are widely believed to have evolved from dinosaurs) appear during the Jurassic. The dominant plants during the Jurassic period were conifers, cycads, and ferns.
The Jurassic world was warmer than that of today, although perhaps not quite as warm as it had been previously, during the Triassic Period. As in the Triassic, there seems to have been no glaciation or ice caps at the poles.
Here are some of the types of dinosaurs that lived during the Jurassic period:
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