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Mesozoic era

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Mesozoic era

  1. 1. Mesozoic EraEarth Science By, Elizabeth Bell
  2. 2. July 22, 2012 Footer text here2
  3. 3. The Mesozoic Era• Began approximately 245 million years ago after a major mass extinction. Issubdivided into 3 periods• Triassic• Jurassic• Cretaceous• Ends about 66 million years ago with a major mass extinctionJuly 22, 2012 Footer text here3
  4. 4. July 22, 2012 Footer text here4
  5. 5. Triassic PeriodJuly 22, 2012 Footer text here5
  6. 6. July 22, 2012 Footer text here6The Triassic Period 245 - 206 millionyears ago Immediately after the Permian Mass Extinction Lots of new area is open for animals to live Three general types of animals holdovers from before the extinction new groups that lasted only a short time new groups that lasted a long time
  7. 7. Two Groups of Dinosaurs• Ornithischian• Hips were similar to modern bird hips• Carnivorous short-necked• Herbivorous, long-necked• Saurischian• Hips were similar to reptile hips• Herbivorous with grinding-teeth• Herbivorous without grinding-teethJuly 22, 2012 Footer text here7
  8. 8. Earliest DinosaursTriassicJuly 22, 2012 Footer text here8Eoraptor:Length:3 feet Height:1feetWeight:20 poundsLesothsaurus: Length:3feet Height:1 footWeight:15 poundsPisanosaurus Length:3feet Height:1 footWeight:15 pound
  9. 9. July 22, 2012 Footer text here9
  10. 10. The Jurassic Period• 206 - 144 MillionYears Ago• Giant plant-eating dinosaurs• Vicious carnivore dinosaurs• Oceans full of fish, squid, sharks, etc.• Ichthyosaurs and Plesiosaurs• Pterosaurs• BirdsJuly 22, 2012 Footer text here10
  11. 11. Jurassic Plant Eating Dinosaurs• Many different forms• Many had ‘armor’ to protect themselves• Triceratops• Ankylosaurus• Many very large (larger than a Rhino/Hippo)• Some were extremely large (as long as a city block): DiplodocusJuly 22, 2012 Footer text here11
  12. 12. Jurassic Carnivorous Dinosaurs• Many different forms• Some were very large:Tyrannosaurus Rex• Allasaurus• Some were smaller:• Raptors, and many more All hadsharp teeth, claws, and speedJuly 22, 2012 Footer text here12
  13. 13. July 22, 2012 Footer text here13
  14. 14. The Cretaceous Mass Extinction• Approximately 60% of all species went extinct.• Affected many land animals/plants• Affected fewer marine animalsJuly 22, 2012 Footer text here14
  15. 15. What organisms were extinct?•All dinosaurs•All pterosaurs•All ichthyosaurs•Many terrestrial plants•Many marine animalJuly 22, 2012 Footer text here15
  16. 16. July 22, 2012 Footer text here16