Time Marches On

2. a fossil that is found in the rock layers on only one geologic age is a
4. what was the scientist surname that has wrote the theory of the earth
6. a subdivision of period
8. a geological change that occurs suddenly
9. one example of an index fossil also known s modern mollusk or a modern squid is called an
11. what is another word of tree sap
12. a fossilized mark that is formed in soft sediment by movement of the animals
14. a famous scientist that had been born in 1788 and his name starts with an J and ends on s
17. the standard method used to divide the earths long natural history
20. what is the best place in the north America to record layers of the rock
21. is a process in which minerals replace an organisms tissue the process is called
23. a mark or cavity made in a sedimentary surface by organisms
25. what was the third era

1. a principle that states that geologic processes that a occurred in past
3. subdivision of n era
5. a remain that is left when the animal decays
7. a guy that’s study fossils are called
10. what was his name palaeontologist who made an important contributions of dinosaurs
13. a unit of time by geologist that includes two periods or more
15. it is when every living thing of their spices have died is called an
16. what is the age of dinosaurs
18. the largest division of geological time
19. what had happened 65 million years ago that scientist think the dinosaurs have died of it what was it
21. what was the first era
22. a type of fossil that forms when sediment fill in the mold and becomes rock
24. In 1999 what animal did Vladimir Eisner had found in the Russian lands