Geologic Time Puzzle

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Across
  1. 5. The age of mammles
  2. 6. Marine life excedes
  3. 7. Longest time period
Down
  1. 1. of the worlds history
  2. 2. Age of reptiles
  3. 3. Shortest period of time
  4. 4. Third longest period of time
  5. 7. Second longest period of time