Geologic Time Scale

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Across
  1. 4. An oxygen poor environment where over time plant and animal material changes into coal
  2. 6. The youngest era of the Phanerozoic eon
  3. 8. Connects two continents that were previously separated
  4. 10. the extinction of many species on earth within a short period of time
  5. 11. These were Mesozoic marine reptiles with small heads long necks and flippers
  6. 13. Are dominant Mesozoic land animals that walked with legs positions directly below their hips
  7. 14. eons are subdivided into smaller units of time called
  8. 15. these are the longest units of geologic time
Down
  1. 1. Were Mesozoic flying reptiles with large bat like wings
  2. 2. A body of water formed when ocean water floods continents
  3. 3. The oldest era of the Phanerozoic eon
  4. 5. The middle era of the Phanerozoic eon
  5. 7. The separation of a population of organisms from the rest of its species due to some physical barrier
  6. 9. eras are subdivided into
  7. 12. An accident landmass which separated into present day continents