Time Marches on......

12345678910111213141516171819202122232425
Across
  1. 1. the period in which glaciers had formed in the pole
  2. 5. the period in which the dinosaurs came to an end
  3. 6. this period was in the ocean
  4. 7. the period in which earth turned green and started to grow plants
  5. 8. the period in which hominids appear
  6. 9. the period where life first evolved
  7. 10. the scientific study of fossils
  8. 12. the land mass made from the collided continent
  9. 14. a unit of geological time into which eras are divided
  10. 16. the standard method used to divide the Earths history into manageable parts
  11. 19. the age of the dinosaurs
  12. 20. a mark or cavity made in a sedimentary surface by a shell or other body
  13. 21. the death of every member of a species
  14. 22. fossils a fossil used to date other fossils
  15. 23. the trace or remains of organisms that lived long ago
  16. 24. a type of fossil that forms when sediments fill in the cavity left by a decomposed organism
  17. 25. a subdivision of a geological period
Down
  1. 2. a principal that states the geoligical process that occured in the past can be explained by current geological processes
  2. 3. a unit of geological time that includes two or more periods
  3. 4. a principal that states the geologic change occurs suddenly
  4. 11. the largest division of geological time
  5. 13. there were 4 of these in all time
  6. 14. the period in which the continents came together
  7. 15. fossil a fossilized mark that is formed in soft sediment by the movement of an animal
  8. 17. was a 20th century vertebrate paleontologist who focused on the study of dinosaurs
  9. 18. the period of swampy forest