Chapter 12 - Geologic Time

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Across
  1. 6. Mesozoic marine reptiles with small heads, long necks, and flippers
  2. 8. a time when a large proportion of Earth's surface is covered by glaciers
  3. 11. the oldest era of the Phanerozoic eon
  4. 12. the youngest era of the Phanerozoic eon
  5. 15. eras are subdivided into these
Down
  1. 1. began 10,000 years ago (We live in this epoch)
  2. 2. dominant Mesozoic land vertebrates that walked with legs positioned directly below their hips (often seen in movies)
  3. 3. the extinction of many species on Earth within a short period of time
  4. 4. an ancient landmass which separated into present-day continents
  5. 5. the middle era of the Phanerozoic eon
  6. 7. connects two continents that were previously separated
  7. 9. periods are subdivided into these
  8. 10. Mesozoic flying reptiles with large, bat-like wings
  9. 13. eons are subdivided into these
  10. 14. the longest units of geologic time