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Geologic Time Lecture
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Geologic Time Lecture

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Transcript

  • 1. Geologic Time Chapters: 22,23,24
  • 2. Earth’s Beginnings
    • 4.6 billion years ago
      • Collection of iron and gasses formed
      • Rotation of cloud caused planet to form
        • Settling of iron to core
      • Early atmosphere formed
        • Water vapor, carbon dioxide (CO 2 )
        • Modern atmosphere Nitrogen (78%), Oxygen (21%), Argon (1%)
  • 3. Theories of Earth Science
    • Uniformitarianism- Hutton- Small changes over a very long time.
      • Examples:
    • Catastrophism- Large changes over small periods of time.
      • Examples:
  • 4. Meteorites
    • Crater Map
    • Visual of crater
  • 5. Geologic Time Scale
    • Record of Earth’s History
    • Eons- largest subdivision
    • Eras- major subdivision
    • Periods- Smallest divisions- made by types of life & geologic events.
  • 6. Geologic Time Scale Con’t
    • Epochs- smallest subdivision-
      • Only found in Cenozoic
      • Why???
    • What is our Eon, Era, Period and Epoch now??
  • 7. Pre- Cambrian Time
    • Oldest and Longest Time Period
    • Almost 90% of Earth’s History
    • From beginning of Earth (4.6 billion years ago) to 540 Million years ago
    • Oldest rocks are the deepest rocks
    • Ores are deposited (iron, silver, gold)
  • 8. Pre-Cambrian Con’t
    • Atmosphere develops oxygen
      • How?
        • Chemical reactions--- at least started process
        • Cyanobacteria
          • Earliest life
          • Small (microscopic) blue-green algae
          • Not even a plant yet
          • Stromolites are their fossils
      • Mass Extinction- Most of life dies (planets change) “an unusually large amount of species die in a short time
  • 9. Phanerzoic Eon, Paleozoic Era
    • Paleo- (Latin) ancient; -zoic (Latin) animals/ life
    • Hard shelled animals appear
    • Pangea formed
    • Plants begin to grow on land
    • “ Age of Fish” large fish populate oceans
    • Amphibians (frogs) go to land
    • Insects appear
  • 10. Paleozoic Con’t
    • Pennsylvanian Period- very large swamps which later become coal
    • Appalachian Mountains Form
  • 11. Mesozoic Era
    • Meso- “middle” -zoic “animals/life”
    • Breakup of Pangea
    • Age of Reptiles- dinosaurs and reptiles rule planet
    • Rocky Mountains form
  • 12. Mass Extinction
    • Dinosaurs are killed by meteorite
    • Animals and plants change
    • 90% of all species that have ever lived are now extinct
  • 13. Cenozoic Era
    • Ceno- “new”; -zoic “life”
    • Last 45 million years
    • Age of Mammals- Humans evolve
    • Ice Ages
    • Flowering Plants
    • Colorado Plateau and Sierra Nevada Mountains formed
  • 14. Organic Evolution
    • Changes in the environment lead to changes in organisms
    • Natural Selection- Certain traits make living in an environment easier
    • Changes in Environment– Pangea moving -> climate -> plants ->animals
  • 15. Extinctions
    • Species dies no more living organisms
    • Cause each major divide in time scale
    • Dinosaurs- meteor, change in plants