| A | B |
|---|
| relative dating | determining whether a fossil or event is older or younger than another object or event |
| amber fossil | fossils in hardened tree sap |
| eon | the largest division of geologic time |
| index fossil | a fossil of an organismthat lived during a relatively short period of time. |
| Superposition | Scientists assign relative ags by using this pronciple |
| fossil | physical evidence of an organism, such as remains or imprints, preserved by geologic processes |
| era | second largest division of geologic time |
| epoch | the fourth largest division of geologic time |
| fossil record | a historical sequence of life indicated by fossils found in layers of the Earth's crust |
| geologic column | the ideal sequenceof rock layers that contains all the known fossils and rock formations |
| absolute dating | giving a specific age to a rock or fossil |
| phanerozoic eon | the eon in which we live |
| trace fossil | any naturally preserved evidence of an animal's activity |
