Time Marches On

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