Graptolites

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Across
  1. 6. graptolite fauna composed of forms with a single biserial branch
  2. 7. a complete graptolite colony
  3. 9. time period when graptolites first evolved
  4. 10. shape of thecae
  5. 13. multi-branched forms with several thecal types in one colony
Down
  1. 1. graptolite fauna composed of forms with multiple stipes
  2. 2. shape of graptolite colony where branches hang down parallel to each other
  3. 3. time period when uniserial single branched graptolites were prevalent
  4. 4. graptolite fauna composed of forms with a single uniserial branch
  5. 5. a branch of a graptolite colony
  6. 6. graptolite fauna composed of forms with two to four branches
  7. 8. the material that graptolites construct their skeletons from
  8. 11. cup that houses an individual graptolite zooid
  9. 12. shape of thecae