Mass extinction notes

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Mass extinction notes

  1. 1. Mass Extinctions
  2. 2. things to note about Extinction <ul><li>Mass extinction vs. background extinction </li></ul><ul><li>† (dagger symbol) next to a name indicates that organism is extinct </li></ul><ul><ul><ul><ul><li>Tyrannosaurus rex† </li></ul></ul></ul></ul><ul><li>Average “lifespan” of species </li></ul>
  3. 4. End Ordovician <ul><li>445 mya </li></ul><ul><li>Intense glacial activity </li></ul><ul><li>Sea level changes </li></ul><ul><li>Circulation & weather disruptions </li></ul><ul><li>85%, but no major groups </li></ul>
  4. 5. Late Devonian <ul><li>376 mya </li></ul><ul><li>Global cooling </li></ul><ul><li>70-82% gone </li></ul>
  5. 6. End Permian (Permo-Triassic) <ul><li>250 mya </li></ul><ul><li>90-95% eliminated </li></ul>
  6. 7. End Triassic <ul><li>200 mya </li></ul><ul><li>76% gone </li></ul>
  7. 8. K/T <ul><li>65 mya </li></ul><ul><li>60% lost </li></ul>
  8. 9. A final thought… <ul><li>Approximately 99.99% of everything that has ever lived on Earth, over the past 3.6 billion years, is now extinct. </li></ul>

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