Geologic Time Vocabulary

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Across
  1. 5. most marine life thrived here in this period
  2. 7. there was mostly plants, ferns, and the first conifer and ginko trees
  3. 8. in horizontalsedimaentary rock layers the oldest layer is at the bottom and the youngest at the top
  4. 12. real age in actual years its either based on fossils or on radioactive decay
  5. 14. relative order of past events without necessarily determining their absolute age
Down
  1. 1. the change in Earth's crust during geological time
  2. 2. tells about the history of the earth
  3. 3. the super continent Pangea split up
  4. 4. billions of years since the Earth started developing
  5. 6. the age of a certain rock layer
  6. 9. preserved remains or traces of living things that are formed when living things die and are buried by sediments
  7. 10. hard-bodied brachiopods, which resembled clams; and arthropods
  8. 11. the numeric age of a layer of rocks or fossils
  9. 13. most marsupials and modern day rodents and cats
  10. 14. parallel layers arranged one on top of another