13-1 Timeline II

Timeline II

In Chapter 2 the class created a timeline of Earth’s entire history, and updated this timeline chapter by chapter. Check the timeline against the previous chart, adding key developments to the timeline wherever they may have been left out. Make sure the following key developments are prominently labeled:

  • First life forms—probably blue-green algae
  • First simple plant life
  • Appearance of complex life
  • Major extinction event at the end of the Permian period
  • Beginning of the Age of Reptiles
  • Major extinction event at the end of the Cretaceous period
  • Beginning of the Age of Mammals
  • The first primates
  • First hominids
  • The first anatomically modern humans
  • Beginning of human cultures
  • The invention of agriculture


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