Ammonites

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