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A Brief History of the Earth

A Brief History of the Earth. Timescale. 7/8 of the entire period life has existed on earth is known as the Precambrian era. During this era, life was largely single celled, and prokaryotic. Other Eras. Following the Precambrian era came the Paleozoic, Mesozoic , & Cenozoic eras.

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A Brief History of the Earth

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  1. A Brief History of the Earth

  2. Timescale • 7/8 of the entire period life has existed on earth is known as the Precambrian era. • During this era, life was largely single celled, and prokaryotic.

  3. Other Eras Following the Precambrian era came the Paleozoic,Mesozoic, & Cenozoic eras

  4. Cambrian Explosion • At the beginning of the Paleozoic era, came the development of multicellularity. With this came an explosion of diverse life forms, only a few lines of these organisms would survive…

  5. Cambrian species Animaloracis Trilobite

  6. Cambrian Organisms contd. Opabinia Sidneyia

  7. Our Distant Ancestor • Pikaia, was the first animal known to posess a notochord, and is probably the ancestor to all vertebrates. Pikaia

  8. Ordovichian The Giant Orthocone

  9. Sea Scorpions

  10. A Canadian Timeline • The following scenes represent the same location of northern Canada, separated only in time.

  11. Devonian period - 360 million years

  12. Dunkleosteus

  13. Permian period - 280 million years

  14. Jurassic period - 180 million years

  15. Lipleurodon

  16. Cymbospondylus

  17. Jurassic period - 140 million years

  18. Cretaceous period - 107 million years

  19. Cretaceous period - 75 million years

  20. Cretaceous period 72 million years

  21. A VERY Bad Day

  22. Another artist’s rendition of impact

  23. The Survivors Some early mammals survived the cataclysm. These would be the ancestors to all living mammals. Mammals weren't the only survivors, there was of course….

  24. TROGDOR!The Burninator

  25. Eocene period - 50 million years

  26. Eocene period - 50 million years

  27. Oligocene - 32 million years

  28. Miocene - 10 million years

  29. Pleistocene - 19,000 years ago

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