Geologic Time

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Across
  1. 4. means middle
  2. 5. first era
  3. 7. current epoch we are living in
  4. 9. eon we are currently living in
  5. 11. means middle
  6. 12. current era
  7. 13. period that arachnids and insects appeared
  8. 14. a division of an era
  9. 16. current period we are living in
Down
  1. 1. period near the era's end the reptiles became dominant
  2. 2. bacteria pillar that we can still find in the great barrier reefs
  3. 3. period amphibians appeared
  4. 4. middle era
  5. 6. shortest span of time
  6. 8. longest unit of time
  7. 10. period continued to develop early vertebrate fish
  8. 15. means old