GEOLOGICAL TIME SCALE

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Across
  1. 4. Period when dinosaurs first appeared
  2. 5. The most recent era, also called the “Age of Mammals” (8)
  3. 8. Abundance of oxygen (Great Oxygenation Event)
  4. 12. Eon that includes all visible life
  5. 13. PHOTOSYNTHETIC ORGANISMS RESPONSIBLE FOR THE INCREASED OXYGEN IN THE EARTH'S ATMOSPHERE
  6. 14. The current epoch we live in
  7. 16. Era that began after the extinction of dinosaurs
Down
  1. 1. Period when flowering plants first evolved
  2. 2. Period immediately before the Jurassic
  3. 3. Boundary marked by a mass extinction that wiped out dinosaurs
  4. 6. FIRST APPEARANCE OF A LIVING ORGANISM, THE PROKARYOTES
  5. 7. Era in which humans appeared
  6. 9. Era known as the “Age of Reptiles (8)
  7. 10. Subdivision of a period; the smallest major unit of geologic time
  8. 11. Time interval smaller than an era but larger than an age (6)
  9. 12. Era dominated by trilobites and early fish
  10. 14. The earliest eon, when Earth first formed
  11. 15. The largest division of geologic time (4)