Paleozoic time period

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