Geological Time scale

2. the science of determining the relative order of past events without knowing the exact age.
4. fossil of a footprint,trail,burrow
5. the action or process of replacing someone or something.
8. a process of fossilization in which mineral deposits form internal costs of organisms.
9. the process by which organic matter exposed to minerals over a long period turns into a stony substance.
10. relating to or denoting the era between the precamberian and the meszotac era.
11. the process of determining an age on a specified chronology.
12. the bones recovered from the tar pits are little changed, large icesheets covered much of the northern atemesphere
14. a fossil used for dating and correlling

1. A basic low of geochronology, stating that in any undisturbed sequence in rocks deposited in layers.
3. a species having no living members in extience.
6. formation of carbon from organic matter
7. any of various hard natural resins usually found in the earth as exudates of trees long dead.
13. relating or denoting the era between palezoic and cenzoic eras