Geologic time

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Across
  1. 3. 1st vertebrates appear
  2. 6. mini ice age
  3. 7. period ended in mass extinction and huge volcanic eruptions
  4. 9. present time
  5. 10. beginning of the fossil records
  6. 12. exposed layers of Craton
  7. 13. age of the dinosaurs
  8. 16. shale sedimentary rock with a lot of preserved fossils
  9. 17. beginning of geologic time
  10. 19. age of the fishes
  11. 20. five percent of mass extinction happened in the mesozoic era
Down
  1. 1. explosion an explosion of new life forms
  2. 2. formation of pangea
  3. 4. main animals in the Paleozoic era
  4. 5. age of the mammals
  5. 8. 2nd period of the paleozoic era
  6. 11. first placental mammals
  7. 12. period 1st land plants and animals appear
  8. 14. index Fossil become extinct
  9. 15. 2nd most common fossil
  10. 18. oldest Rocks