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Quaternary (Q)-Cenozoic
Recent .01, Holocene, 1.8 Pleistocene
Continents in modern positions, evol of homo sapiens ICE AGE, age of mammals
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Tertiary (T) - Cenozoic
5.3 Pliocene, 23 Miocene, 33.9 Oligocene, 55.8 Eocene, 65.5 Paleocene
- Continents nearing modern positions
- ICE AGE
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Cretaceous (K) - Mesozoic
145, most continents separated mass extinction at end of period for dinosaurs, rise of angiosperms
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Jurassic (J) - Mesozoic
200, continents separating, diverse dinosaurs, first birds, origin of mammals
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Triassic (Tr) - Mesozoic
251, Continents begin to separate marine diversity increases (age of reptiles), first dino and mammals
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Permian (P) - Paleozoic
299, Pangea, glaciations, major mass extinctions, especially marine life
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Carboniferous (C) - Paleozoic
359, Gondwana and small northern continents form, extensive forests, first reptiles, coal age
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Devonian (D) - Paleozoic
416, Diversification of fish, first amphibians, insects, first land plants
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Silurian (S) - Paleozoic
444, origin of jawed fishes, earliest plants, arthropods
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Ordovician (O)- Paleozoic
488, diversification of echinoderms
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Cambrian (C) - Paleozoic
542, Marine animals diversify, first appearance of most animal phyla, first vertebrates, invertebrates with hard parts
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Proterozoic
2500, earliest eukaryotes
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Archean
Origin of life, photosynthesis, aerobic respiration
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