Geologic Time Scale : Crossword

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Across
  1. 4. Age Close to the real age
  2. 7. Youngest to Oldest rocks
  3. 8. The Age of mammals
  4. 10. Which Era the dinosaurs existed
Down
  1. 1. Half of the remaining Isotope
  2. 2. A rock formation cuts through older rocks
  3. 3. Made from something that has already dies
  4. 5. Age Exactly to the real date
  5. 6. Rock or Fragment inside a rock
  6. 9. Dating and correlating the strata