Imp EVENTS GEO 2 test

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Anonymous
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24367
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Imp EVENTS GEO 2 test
Updated:
2010-06-21 02:56:31
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Imp EVENTS GEO test
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Imp EVENTS GEO 2 test
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  1. Precambrian
    • A. FIRST LIFE APPEARED at 3.5 by
    • 1. Simple , single caelled bacteria and algae
    • B. LATE PRECAMBRIAN
    • 1. Earliest multicelled organisms
  2. Paleozoic Era
    • A. CAMBRIAN PERIOD
    • 1. Earliest organisms with shell
    • 2. Earliest fish
    • B.LATE ORDOVICIAN PERIOD
    • 1. Ealiest land plants
    • C.LATE DEVONIAN PERIOD
    • 1. Earliest amphibians
    • D. PENNSYLVANIA PERIOD
    • 1. Earliest reptiles-laid shelled eggs
    • E. END OF PALEOZOIC ERA
    • 1. Largest mass extinction in earth history
    • 2. -90% of all marine species extinct
  3. MESOZOIC ERA
    • A. LATE TRIASSIC PERIOD
    • 1. Earliest true mammals
    • 2. Earliest dinosaurs
    • B.LATE JURASSIC PERIOD
    • 1. Earliest birds
    • C.END OF MESOZOIC ERA
    • 1. Mass extinctions
  4. Cenozoic Era
    A. AGE OF MAMMALS

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