Geologic Time Scale Crossword

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Across
  1. 4. began 544 mya
  2. 6. began 2 mya
  3. 8. began 438 mya
  4. 10. began 4.54 billion to 600 mya
  5. 11. began 408 mya
  6. 12. began 208 mya
  7. 13. 368 mya
Down
  1. 1. began 360 mya
  2. 2. began 320 mya
  3. 3. began 144 mya
  4. 5. began 505 mya
  5. 7. began 65 mya
  6. 9. began 245 mya