Jurassic life. Computer artwork of a forest full of prehistoric creatures that existed during the Jurassic Period (200 to 145 million years ago) in what is now North Yorkshire, England, UK. These include: a megalosaur (centre left), a stegosaur (centre right), a hypsilophodont (lower right), and a dromaeosaur (centre right) chasing a coelurosaur (centre, in the water). In the bushes behind are two large sauropods, while a pair of pterodactyls fly overhead. On the far bank are gavials (crocodilians). The plants include horsetails, cycads, bennettitalians, cypress trees, ginkgos, and tall araucarian pines.