Eons and Eras
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12 Terms
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Archean
2500-4000 myr ago - very little life, little safe oxygen
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Proterozoic
2500-542 myr ago - first life in the ocean; worms, jellyfish, bacteria
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Phanerozoic
542 myr ago - present - visible life
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Eras of the Phanerozoic (*youngest to oldest*)
Cenozoic
Mesozoic
Paleozoic
Mesozoic
Paleozoic
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Cenozoic
Phanerozoic eon; recent life
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Mesozoic
Phanerozoic eon; middle life; dinosaurs
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Paleozoic
Phanerozoic eon; ancient life; ocean
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Cenozoic Periods and Epochs (*youngest to oldest*)
Quaternary
* Holocene
* Pleistocene
Tertiary
* Pliocene
* Miocene
* Oligocene
* Eocene
* Paleocene
* Holocene
* Pleistocene
Tertiary
* Pliocene
* Miocene
* Oligocene
* Eocene
* Paleocene
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Mesozoic Periods (*youngest to oldest*)
Cretaceous
Jurassic
Triassic
Jurassic
Triassic
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Paleozoic Periods (*youngest to oldest*)
Permian
Pennsylvanian
Mississippian
Devonian
Silurian
Ordovician
Cambrian
Pennsylvanian
Mississippian
Devonian
Silurian
Ordovician
Cambrian
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All Periods (*youngest to oldest*)
Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Pennsylvanian
Mississippian
Devonian
Silurian
Ordovician
Cambrian
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Pennsylvanian
Mississippian
Devonian
Silurian
Ordovician
Cambrian
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