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The Cenozoic Era (The Era of Mammals) Name: ______________________________________________ Date: _______________________ 1. At the beginning of the Mesozoic, the continents were all joined into a single land mass known as Pangaea. Explain how this supercontinent broke apart (first into two continents then into more). Period Triassic Jurassic Time (million years ago) Geologic Events Biology Atmosphere Temperature Cretaceous 3. What were the climatic conditions during the Mesozoic? 4. Discuss the evolution of Dinosaurs and explain the differences between Saurischians and Ornithiscians. 5. There is a smaller extinction event after the Triassic – what caused this extinction? 6. What are the potential causes of the K-T (Cretacious-Tertiary) extinction event that wiped out the dinosaurs? 7. How were scientists able to locate the Chicxulub Crater thought to be the cause or one of the causes of the K-T extinction?