Geologic Time Scale

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Across
  1. 1. radioactive decay over ____ time
  2. 3. a fossil that seperates two periods of time
  3. 5. parts of a layer in another layer
  4. 7. a line that messes up the law of superposition
  5. 8. helps find absolute age
  6. 9. an estimate of the age
Down
  1. 2. preserved living beings
  2. 4. has a fault line
  3. 6. exact age
  4. 10. a time period with specific fossils