Geologic Time Scale

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Across
  1. 5. geological eon spanning from the appearance of oxygen
  2. 8. the record of the fossils that have been found
  3. 9. gives the age in exact years
  4. 10. position of rock layers
Down
  1. 1. half the time it takes for something to decae
  2. 2. first life form found
  3. 3. "new life" most recent of the 3 geological eras
  4. 4. evidence of past animal
  5. 6. geologic eon of the earth, predating to the archean
  6. 7. assumption of age based on rock layers