Ammonites

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Across
  1. 3. stitches
  2. 6. didn't go to school
  3. 12. from long ago
  4. 14. rejecting
  5. 15. geologic time
  6. 16. a wall
  7. 19. indicators of time
  8. 20. of the same family
Down
  1. 1. and regular surface without bumps
  2. 2. small tube
  3. 4. marked with raised bands
  4. 5. driving forward
  5. 7. octopus clan
  6. 8. article
  7. 9. there were many of them
  8. 10. you can hang your coat on it
  9. 11. immediate
  10. 13. the ability to float
  11. 17. proof
  12. 18. length of concentric rings