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Time & Change (Relative Dating (Zone fossils (Rapid Evolutionary…

- - - - Metamorphism can contaminate rocks with more K40 and make the rock seem younger
      - Weathering/ Erosion releases the Argon gas
  - - - Parent K40
      - Daughter Ar40
      - Half life= 1.26 billion years
      - 100,000 yrs + age for dating
      - Feldspar in igneous rocks is dated
      - Ar40 is gas
      - Can be affected by Metamorphism and Weathering
    - - Parent Sm147
      - Daughter Nd147
      - Not affected by Metamorphism and Weathering
      - Half-life= 106 billion years
      - Feldspars and Pyroxenes are dated
      - Can be used to date all rocks
      - 10 million yrs + age for dating