Geological Time Scale

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Across
  1. 2. animal can be trapped, and the whole can be preserved
  2. 5. a sequence of layers of sedimentary rock
  3. 6. a time of dramatic geological, and climatic, and evolutionary change
  4. 9. assigning actually dates
  5. 10. water dissolves the original solid material and replaces them with mineral
  6. 12. indicate to geologists the boundaries in geological time.
  7. 13. about 66 million years ago
  8. 14. result in organic material converting into rock
  9. 15. amber
Down
  1. 1. provides indirect evidence of life in the past rather than the body of an animal itself
  2. 3. determining the order of past events
  3. 4. means middle life (252-66 million years ago)
  4. 7. original material is preserved rather than replaced
  5. 8. all substances of plants and animals decay
  6. 11. no longer existing