Geological Eras

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6 Terms

1
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major geological features of precambrian

formation of canadian shield, brazilian shield, african sheild, australian shield

2
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major biological events of precambrian era

  • first multi celled organisms

  • first single cell organisms

3
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major geological features of paleozoic era

  • north america covered by shallow seas

  • appalachians formed

4
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major biological events of paleozoic era

  • amphibians and fish

  • first insects

  • swamps

  • first plants and animals

5
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major geological features of cenozoic era

  • ice sheets covering north america

  • continents in present shape

  • formation of rocky mountains completed

6
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major biological events of cenozoic era

  • humans begin development

  • age of mammals

  • modern forms of live evolve