Mesozoic
Era "Age of Reptiles" 245 to 65 mya |
Cretaceous Period 146 to 65 mya ![]() |
Upper 98-65 mya |
High tectonic and volcanic activity. Continents have a modern-day look. Minor extinction 82 mya. Ended with large extinction (the K-T extinction) of dinosaurs, pterosaurs, ammonites, about 50 percent of marine invertebrate species, etc., probably caused by asteroid impact. | |
Lower 146-98 mya |
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Jurassic Period 208 to 146 mya |
Many dinosaurs, including the giant Sauropods. The first birds appear (Archaeopteryx). Many ferns, cycads, gingkos, rushes, conifers, ammonites, and pterosaurs. Minor extinctions at 190 and 160 mya. | |||
Triassic Period 245 to 208 mya |
The first dinosaurs, mammals, and crocodyloformes appear. Mollusks are the dominant invertebrate. Many reptiles, for example, turtles, ichthyosaurs. Triassic period ends with a minor extinction (35% of all animal families die out). |
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