Geologic Time Scale CROSS/SEARCH

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Across
  1. 4. the predictable time an element takes to decay
  2. 7. Era that saw the rise of marine plants and invertebrates, fish, ferns, and amphibians
  3. 8. largest division in the Geologic Time Scale
  4. 9. sedimentary rock layers
  5. 12. era that was the time of the dinosaurs and the development of small mammals, birds, conifers, and flowering plants
  6. 13. the smallest and most specific division in the Geologic Time Scale
  7. 14. special fossils that indicate to geologists the boundaries in geological time
  8. 15. the largerst eon in the Geologic Time Scale
  9. 17. the next to the smallest division of the Geologic Time Scale
  10. 18. branch of geology dealing with the arrangement of sedimentary rock layers
  11. 19. history of life as documented by all fossils, preserved in sedimentary rock strata
Down
  1. 1. a scientist who studies the Earth’s crust as well as the processes and history that shaped it
  2. 2. a scientist that studies fossil remains found on the Earth’s surface in order to study primitive life forms
  3. 3. determines the order of past events but not the absolute age.
  4. 5. era in which we live, as well as large mammals and periodic ice ages
  5. 6. the assumption that the newest rock layers are on top of the older ones, unless some type of disturbance occurs
  6. 10. most accurate form of dating, also call radiometric dating
  7. 11. preserved remains or traces of animals, plants, and other organisms from the remote past
  8. 16. division in the Geologic Time Scale in which the eon is divided