outline10 - Outline10 2/27/03...

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  Outline 10 2/27/03   Features of a "geologic clock ":      1. Accuracy  - runs at a constant rate      2. Resistant      3. Starts at time of formation  of geologic feature      4. Has suitable rate  for feature you want to date      5. Has several clocks  running to check against each other   Early attempts  to date age of Earth, rocks, etc.   Discovery of radioactivity  in 1890's and 1st use in dating geologic      features (Boltwood, 1907)   Nature of radioactive decay  (exponential  decay of an unstable parent      isotope through one or many steps to a stable daughter  isotope)      Parent (P)   Daughter (D), rate described by constant called       Half life  (H) for each parent-daughter combination; need closed      system  in order to get accurate date, where P + D = Po (usually
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outline10 - Outline10 2/27/03...

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