Paleozoic time period

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Across
  1. 3. Time period lasting from 544-245 MYA
  2. 8. First and oldest species of the cambrian period
  3. 12. appeared in the Carboniferous period
  4. 13. Time within Paleozoic era lasting from 544-500 MYA
Down
  1. 1. thought about this idea
  2. 2. Appeared in the silurian time period
  3. 4. Time within Paleozoic era lasting from 360-286 MYA
  4. 5. Time within Paleozoic era lasting from 500-440 MYA
  5. 6. Time within Paleozoic era lasting from 440-410 MYA
  6. 7. Time within Paleozoic era lasting from 286-245 MYA
  7. 9. Became abundant and diverse in the devonian time period
  8. 10. First appeared in the ordovician time period
  9. 11. Time within Paleozoic era lasting from 410-360 MYA