Geologic Time Scale

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Across
  1. 2. a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
  2. 5. is a process of fossilization in which mineral deposits form internal casts of organisms
  3. 7. is the process by which organic matter exposed to minerals over a long period is turned into a stony substance.
  4. 9. a basic law of geochronology
  5. 13. is the action or process of replacing someone or something.
  6. 14. (of a species, family, or other group of animals or plants) having no living members; no longer in existence.
  7. 15. the era between the Paleozoic and Cenozoic eras or the system of rocks deposited during it.
Down
  1. 1. any fossil of various hard natural resins (as amber or some copals) usually found in the earth as exudates of trees long dead.
  2. 3. age dating science of determining the relative order of past events
  3. 4. a fossil that is useful for dating and correlating the strata in which it is found.
  4. 6. formation of carbon from organic matter
  5. 8. trapped over many thousands of years in soil made gooey by crude oil that was seeping up from deep underground preserving
  6. 10. the era between the Precambrian eon and the Mesozoic era, or the system of rocks deposited during it.
  7. 11. age dating deals with assigning actual dates (in years before the present) to rocks or geological events
  8. 12. the most recent geological era, or the system of rocks deposited during it.