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CHAPTER 3: FOSSIL RECORDS: EVIDENCE OF CHANGE (Mass Extinctions: A huge…

- - - - Aided by studying fossils in the different layers. e.g finding similar fossils in rocks a long way apart= rocks are similar age.
  - - - E.g Fossil with unstable isotope carbon 14 (6 protons, 8 neutrons) decays to form nitrogen 14 (7 protons, 7 neutrons)
      - Age of fossil calculated up to 70,000 years
      - Other Elements in radiometric dating: (Can date back billions of years because of their longer decay rate(
        
        Potassium (decays to argon),
        
        Uranium (decays to lead)