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