LUDEK PESEK / SCIENCE PHOTO LIBRARY LUDEK PESEK / SCIENCE PHOTO LIBRARY
An artist's impression of a Jurassic landscape. The Jurassic period extended from 195 to 135 million years ago. Jurassic flora included many forms still living today, such as cycads, ginkgoes, conifers and ferns. The fauna of the period was extremely diverse; ammonites and other molluscs, hexacorals and echinoids were abundant in seas and freshwater. The dominant terrestrial animals were the dinosaurs. Small mammals were already present, and the first birds began to appear during this period.
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