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PALEOZOIC ERA
Age of sea-life
CAMBRIAN
• 542 mya• Gondwanaland- mainly in S. Hemisphere• “waterworld”
CAMBRIAN LIFE
• Ocean life• Trilobites- over 800 species• First shells
Ordovician
• 505 mya• Mostly water (still)• Barren land
Ordovician
• Ocean life- warm reefs• Mollusk• Trilobites• Cephlapods• First fish
Ordovician fossils (IL)
Silurian
• 443 mya• Still Gondwanaland• North America under water
Silurian life
• Corals• Brachipods• Sea scorpions• First plants- ferns