Explanation

Jurassic period is the second geological period of Mesozoic era. In this period, the gymnosperms were dominant and the plants included ferns, cycads, Ginkgo, rushes and conifers, among animals, important invertebrates included anamniotes, corals, brachiopods, bivalves and echinoids. Reptiles dominated the vertebrates and the first flying reptiles, the pterosaurs appeared. The first primitive bird,$Archaeopteryx$ also made its appearance.