Geological Time

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Across
  1. 4. The oldest geological time period
  2. 5. Scientists use these as evidence to support geological theories
  3. 6. The scientific study of rocks
  4. 8. Important group of arthropods in geological time
  5. 9. Famous ancient life form found of the Western Australian coast
  6. 11. The most recent of the geological time periods
  7. 12. Believed to have caused the extinction of the dinosaurs
Down
  1. 1. The process which exposes ancient rock formations
  2. 2. Referred to as the "Age of the Dinosaurs"
  3. 3. Name given to animals that do not have a backbone
  4. 5. The process by which ancient living beings are preserved
  5. 7. The time period in which vertebrates first developed
  6. 9. Rock type that allows excellent fossils to form
  7. 10. Geological time is broken up into 4 of these