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Geologic Time Lecture

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Geologic Time Lecture

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

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