Directions: Use a textbook or a reliable Internet site to review the significant events that have
occurred throughout Earth’s history. Record which era or period these events occurred during.
1. How many years ago did the Earth form?
2. What period did the Age of Fishes begin?
3. What period did Pangaea form?
4. What period did swamps cover eastern North America and parts of Europe?
5. What period did the Age of Reptiles begin?
6. What period did the first turtles and reptiles appear?
7. What period did the dinosaurs first appear?
8. What period did Pangaea begin to break apart?
9. What period did the first birds appear?
10. What period did the first flowering plants appear?
11. What period did the first grasses appear?
12. What period did the Age of Mammals begin?
13. What period did modern humans evolve (100,000 years ago)?
14. What period did the first amphibians reach land?
15. What period did the Appalachian Mountains begin to form?
16. What period did jawless fishes become common?
17. How many years ago did bacteria appear?
18. What period did coral reefs develop?
19. What are the three periods in the Mesozoic Era?
20. What are the two periods of the Cenozoic Era?
21. What are the six periods of the Paleozoic Era?
Beverly Owens
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