Radiometric dating worksheet
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The first flying vertebrates (backboned animals) evolved during the latter part of the Triassic period.
Turtles, crocodile-like species, and frogs made their first appearances during the Triassic, as well.
Sea animals included some survivors of the mass extinction event at the end of the Paleozoic Era including ammonites (much like the modern-day Nautilus), brachiopods, and mollusks (modern day snails are mollusks), and new reptiles including plesiosaurs and ichthyosaurs.
Terrestrial vegetation was still dominated by ferns, cycads, gingkos, and conifers - all gymnosperms.
Insect herbivores, especially beetles, diversified during this time to feed on the abundant vegetation.
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One other major group evolved during the Triassic: mammals.