Geologic Time

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Across
  1. 3. This era, another word for "ancient life" came during a time when most organisms were simple marine animals
  2. 4. The era in which humans exist
  3. 6. The largest divison of time
  4. 7. The smallest division of time
Down
  1. 1. A subdivision of an era
  2. 2. This era ended in the extinction of dinosaurs
  3. 5. A subdivision of an eon