Also Try Dinosaurs Papers Cretaceous Period of Time (Museum of Paleontology) Covers 146 to 65 million years ago. 4-02 Jurassic Period of Time (Museum of Paleontology) Covers 208 to 146 million years ago. Dinosaurs roamed the earth during this period. Mesozoic Period (EnchantedLearning.com) Provides a definition of the mesozoic era of history, the age of reptiles. 5-01 Mesozoic Period of Time (Museum of Paleontology) Covers 245 to 65 million years ago. 4-02 Triassic Period of Time (Museum of Paleontology) Covers 245 to 208 million years ago. 4-02

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