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Phanerozoic 542mya to present
Not many life forms until very end. -
Paleozoic 542mya-251mya
Evolution of fish, insects, and reptiles. -
Cambrian 542mya-488mya
Marine intertebrates evolve. -
Ordovician 488mya-443mya
Condonts, ostracods, algae, and seaweeds evolve. -
Ordovian Mass Extinction
Thought to be caused by a drop in sea levels as glaciers formed. The followed by rising sea levels as glaciers melted. (Ice Age) -
Silurian 443mya-416mya
First air-breathing animals evolve. -
Devonian 416mya-359mya
Fish, amphibians, and ammonites evolve. -
Devonian Mass Extinction
Some theories include change in sea level, asteriod impacts, climate change, and new plants chaning soil. -
Carboniferous 359mya-299mya
Land covered in forests so insects evolved and became very large. -
Permian 299mya-251mya
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Mesozoic 251mya-65mya
Dinosaurs lived during this time. -
Triassic 251mya-199mya
Dinosaurs begin to evolve, while dicynodonts become extinct. -
Permo-Triassic Mass Extinction
Earths biggest mass-extinction. Theories are the comet and asteriod hitting earth, volcanic eruption, and loss of oxygen in sea levels. -
Jurassic 199mya-145mya
Dinosaurs flourish and become very large. Conifers grow. -
End-Triassic Mass Extinction
Caused by massive floods of lava, breakup of pangea, and opening of Atlantic Ocean. -
Cretaceous 145mya-65mya
End of age of reptiles. Evolution of modern insects and flowering plants. -
Cretaceous-Tertiary Extinction
Caused by gradula climate change or volcanic eruptions. -
Cenozoic 65mya-present
Mammals evolve. Along with humans. -
Paleogene 65mya-23mya
Evolution of birds, mammals, and various forms of humans. -
Neogene 23mya-2.5mya
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Quaternary 2.5mya-present
The last two million years. Mammals are dominant. -
Sixth Mass Extinction
Said to be caused by humans. To happen in the future. Claimed to be the largest yet.