Geologic Time

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Across
  1. 2. a major division of geologic time that contains two or more periods
  2. 3. older layers on bottom, younger on top
  3. 4. Flying mammal
  4. 8. actual age of a rock or fossil
  5. 9. a fossil that is widespread and lived for a short period of time
  6. 12. name for the time in earths early history that accounts for ninety percent of earth's time, but only unicellular organisms lived
  7. 13. "Ancient life"; Most life was found in the Ocean
  8. 14. the longest division of geologic time; there have been 4 total
  9. 16. makes up Indiana's bedrock
  10. 17. the shortest division of geologic history that contains a notable event
  11. 20. age of a rock or fossil in comparison to other rocks or fossils
  12. 21. the end of a species
  13. 22. Man's best friend
Down
  1. 1. scientific term for matching
  2. 2. Has a trunk
  3. 5. The era we live in is....?
  4. 6. limestone dissolving to create features like caves
  5. 7. Large marsupial
  6. 10. the interval of time since the formation of Earth
  7. 11. a gap in the geologic record where rock layers are missing
  8. 15. middle life, age of dinosaurs
  9. 18. Likes to chase mice
  10. 19. a division of geologic time that contains two or more epochs; the third largest "chunk" of time.