Across
- 4. what is the best place in the north America to record layers of the rock
- 6. a famous scientist that had been born in 1788 and his name starts with an J and ends on s
- 8. a type of fossil that forms when sediment fill in the mold and becomes rock
- 10. subdivision of n era
- 11. a mark or cavity made in a sedimentary surface by organisms
- 12. the largest division of geological time
- 13. is a process in which minerals replace an organisms tissue the process is called
- 14. a fossilized mark that is formed in soft sediment by movement of the animals
- 17. a subdivision of period
- 18. a principle that states that geologic processes that a occurred in past
- 19. a guy that’s study fossils are called
- 21. a remain that is left when the animal decays
- 22. it is when every living thing of their spices have died is called an
- 24. what had happened 65 million years ago that scientist think the dinosaurs have died of it what was it
- 26. a fossil that is found in the rock layers on only one geologic age is a
Down
- 1. what was the scientist surname that has wrote the theory of the earth and he is Scottish
- 2. a geological change that occurs suddenly
- 3. what is the age of dinosaurs?
- 5. In 1999 what animal did Vladimir Eisner had found in the Russian lands
- 7. what was the first era
- 9. the standard method used to divide the earths long natural history
- 15. what is another word of tree sap
- 16. what was his name paleontologist who made an important contributions of dinosaurs
- 20. a unit of time by geologist that includes two periods or more
- 23. what was the third era
- 25. one example of an index fossil also known s modern mollusk or a modern squid is called an