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A Lesson on Dating

A Lesson on Dating. Geologic. How old is old?. Absolute Dating Analogous to your age . . . i.e. an exact number Often found using the radioactive decay of certain elements. Relative Dating Dating with regard to an order of events . . . analogous to knowing that you are the middle child

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A Lesson on Dating

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  1. A Lesson on Dating Geologic

  2. How old is old?

  3. Absolute Dating Analogous to your age . . . i.e. an exact number Often found using the radioactive decay of certain elements Relative Dating Dating with regard to an order of events . . . analogous to knowing that you are the middle child Found by examining the local geology and discovering what happened before and after How do you date a rock?

  4. Who would want to date a rock?

  5. Three simple rules for dating rocks: • Law of Original Horizontality • i.e. if you dump out a bunch of sand, it won’t stack up vertically . . . • Law of Cross-Cutting Relationships • In order to cut something, something has to be there before you cut it • Law of Superposition • If you are making a sandwich, you can’t put the top on first . . .

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