Precambrian

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Across
  1. 1. coal forming forests
  2. 2. Abundant amphibians and marine organisms
  3. 3. lots of dinosaurs
  4. 6. Earliest amphibians and plant seeds
  5. 9. start of the solar system
  6. 10. Earths first coral reefs
  7. 11. earliest mammals
Down
  1. 1. Abundant reptiles
  2. 4. Earliest flowering plants
  3. 5. burgess shale fauna
  4. 7. earliest insects
  5. 8. First sexually reproductive organisms