Geological Time Scale

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Across
  1. 3. Animals that have hair and give birth to living things
  2. 6. Scaly air-breathing animal
  3. 9. Scientist who studies fossils
Down
  1. 1. Next largest division of the geologic time scale
  2. 2. Cold-blooded vertebrates
  3. 4. Extinction Large amount of things dying
  4. 5. Preserved evidence of an organism
  5. 7. Time Scale A model
  6. 8. Reptile that lived during the mesozoic era
  7. 10. Any vertebrate that has 4 limbs