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Crinoid USA F1923
This period is without doubt, the heyday of reptiles (and dinosaurs) dozens of species ruled the Earth. Also present during this period were the first flying dinosaurs like Archaeopteryx. These were primitive progenitors of the common day birds. Also the number of mammals expanded drastically, and the first crocodiles appeared. In the botanical area there is the emergence of gymnosperms and in the oceans, the amounts of shellfish boomed. Many species of ammonites and sea urchins roamed the seas.
Situating the Jurassic period on the geological timescale
See also the article on the Geologic Timescale.
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