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7_AriLexi_EarthGeoTimeScaleReview

Published on Nov 21, 2015

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PRESENTATION OUTLINE

1.

GEOLOGICAL TIME SCALE

BY LEXI ARI
2.

GENERAL TRENDS OF THE 12 PERIODS

  • The periods sometimes ended with mass extinction
  • Life first started in the ocean
  • Overtime, life on land was found
  • See a change in dominant life forms when organisms become extinct.
3.

3 ERAS

  • Paleozoic
  • Mesozoic
  • Cenozoic
4.

RADIOACTIVE DATING

  • Used to determine absolute age of certain divisions on the time scale
5.

GEOLOGICAL TIME SCALE

  • Record of life forms and geological events in earths history
Photo by kevin dooley

Holly Steele