time period

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Author:
dmrobert86
ID:
137275
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time period
Updated:
2012-02-26 17:29:44
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time period
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time period
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  1. formation of the earth
    4.6 BYA
  2. Precambrian consists of
    archean and proterozoic
  3. archean era was when
    atmosphere was low in O2, cyanobacteria
  4. end of proterozoic
    543 MYA where there were only multicelluar organisms
  5. in the paleozoic era
    Cambrian, devonian, and permian
  6. cambrian period
    cambrian explosion
  7. Devonian
    400mya fishes with jaws, insects, wooded plants
  8. permian
    251 mya
  9. phanerozoic epoch
    paleozoic, mesozoic era, and cenozoic
  10. mesozoic era contained
    triassic, jurassic, and cretaceous
  11. Triassic
    started 251mya
  12. Jurassic
    the middle of the mesozoic era
  13. cretaceous
    65mya extinction of dinosaurs
  14. Cenozoic era
    last era contains tertiary and quaternary
  15. tertiary
    65mya
  16. quaternary
    1.8mya pleistocene, pilocene and milocene

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