Geologic Time Scale Crossword

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Across
  1. 3. this eon includes the hadean, archean and proterozoic eons
  2. 5. the time period we are in currently
  3. 8. these formed 359.2 mya
  4. 11. the ________ is 4.6 billion years old
  5. 13. the era known as the age of reptiles
  6. 14. at the end of this period, dinosaurs went extinct
  7. 16. the numbers on your timeline represent this amount
Down
  1. 1. mass _________ are the way we divide geologic time
  2. 2. at the end of this period, the largest mass extinction occurred (95% of life extinct)
  3. 4. this species showed up about 0.01 mya
  4. 6. this period started 476 mya and ended 359.2 mya
  5. 7. the era known as the age of mammals
  6. 9. this era includes periods like silurian, devonian, carboniferous
  7. 10. this eon began with "hard shelled animals" (also the current eon)
  8. 12. the first of these showed up 4000 mya
  9. 15. the epoch we are currently in