Which era is the oldest?

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Tags

  1. #originally
  2. #fossils
  3. #precambrian
  4. #before
  5. #means
  6. #common
  7. #still
  8. #period
  9. #earth
  10. #history
  11. #oldest
  12. #cambrian
  13. #refer
  14. #rocks
  15. #recognizable
  16. #formation
  17. #whole