types of fossils

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Across
  1. 2. used to define and identify geological periods
  2. 4. chemicals found in rocks and remains
  3. 6. fossils to tell absolute age
  4. 8. mostly tracks and burrows
  5. 9. preserved in the fossil record
  6. 10. at or below the level of analysis of the naked eye
Down
  1. 1. any fossolized remains
  2. 3. fossil found significally after death
  3. 5. study of fossils
  4. 7. remains that have not fully fossilized