Ammonites

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