The Jurassic was the second geological period of the Mesozoic era. It followed the Triassic, which ended about 190 million years ago, and extended until the beginning of the Cretaceous period, about 139 million years ago. It was named in 1829 by A Brongniart after the JuraMountains on the borders of France and Switzerland.
Jurassic rocks include clays and limestones in which fossil flora and fauna are abundant. Plants included ferns, cycads, ginkgos, rushes, and conifers. Important invertebrates included ammonites (on which the
Jurassic is zoned), 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 during this period. Research Jurassic
Abbreviations
Rocks & Minerals
Research Jurassic