Geologic time words

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Across
  1. 3. Before fossils
  2. 6. Longest era
  3. 7. The time period from 199.6 million yrs ago to 145.5 million yrs ago
  4. 8. The longest time period
  5. 9. The most present time period
  6. 10. How to tell the age of rock layers
  7. 11. First time period with fossils
Down
  1. 1. First modern form of humans
  2. 2. First land plants to come
  3. 4. First mammals
  4. 5. The first amphibians
  5. 12. Most extinction in a time period