Across
- 3. remains, imprints, or traces of organisms one lived and how they lived
- 5. the surface where new rock meets older rock
- 6. no longer in existence, no members of the species still living
- 8. scientists who studys rocks
- 10. an organism considered an index fossil
Down
- 1. the number of years scince the rock formed
- 2. the collective group of all fossils already discovered
- 4. a break in the Earths crust
- 7. fossils of species that existed for a relatively short time
- 9. a rocks age compared with the ages of the rocks around it