Geologic Time Scale

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Across
  1. 2. Smallest time period
  2. 3. Largest time period
  3. 6. Second largest time period
  4. 7. 66 million years ago, evolution of aniamls
  5. 8. Second to last smallest time period
Down
  1. 1. Representation of time based on rock record of earth
  2. 4. 541-252 million years ago, first amphibians and fish
  3. 5. 251.9 to 66.0 million years ago, age of the dinosaurs