Geologic Time Vocab

4. The numeric age of a layer of rock or fossils
5. Fossils used by scientists to more accurately determine the age of a nearby fossil or layer of rock
8. Shows how organisms are related
9. Broken down pieces of rock that are moved and settled on land
12. Structures that are similar in the body of a related species that have been passed down from a common ancestor
13. The purpose of something or a special job that it does
15. Fossils that link past and present organisms

1. The shapes and arrangement of the bones that are organized and placed in a particular way
2. Group of organisms that is shared throughout many other lineages
3. States that a layer is older than the layer above it but younger than the layer below it
6. The study of strata
7. Genetic information inside the cells with instructions that tell how to make the body
10. Layers of rock
11. The approximate age of a layer of rock or fossils
14. Remains of organisms
16. Rocks made of loose eroded particles that harden together over time