Geologic Time

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Across
  1. 4. mammals which walk upright and evolved in the cenozoic
  2. 5. shortest era
  3. 7. era when pangaea formed
  4. 9. gas produced by cyanobacteria
  5. 12. evolved during the mesozoic
  6. 16. mountains formed above India
  7. 18. invertebrates existed as early as the paleozoic
  8. 19. have eggs with hard shells, came after amphibians
  9. 22. largest mass extinction in history
  10. 23. layer that protects life on land
  11. 24. period of time when earth was largely lifeless
  12. 26. descendant of dinosaur - survived mesozoic extinction
  13. 28. mountains formed when Pangaea formed
  14. 30. super continent
Down
  1. 1. animal that dominated the mesozoic era
  2. 2. lay eggs in water, evolved after fish
  3. 3. photosynthetic bacteria
  4. 6. massive mammals which developed in the cenozoic
  5. 8. climate during the cenozoic when NY was covered in ice
  6. 10. vertebrates which evolved during the paleozoic
  7. 11. climate during the mesozoic
  8. 13. size of mammals in the mesozoic era
  9. 14. era when Pangaea broke up
  10. 15. name of northern continent - post pangaea
  11. 17. plants with seeds but no flowers - evolved in the paleozoic
  12. 19. mountain found in western US, began forming in the Mesozoic
  13. 20. earliest era
  14. 21. name of southern continent - post pangaea
  15. 25. cause of mesozoic extinction
  16. 27. when ocean water runs over continents
  17. 29. mountains just above Italy, formed in the cenozoic