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sudden explosion of life; trilobites dominant; rise of other marine invertebrates;some vertebrates
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giant dinosaurs; early birds;firs mammals 199,600,000 years ago
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Ice Age(s); mass extinctions; rise of man 1,800,000 years ago
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In this period end the last Ice Age; rise of human civilization 11,477 years ago
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rise of grazing mammals 23,000,000 years hago
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modern insects; reptiles spread; evergreens; extinction of trilobites 299,000,000 years ago
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giant insects;first reptiles 318,100,000 years ago
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primitive apes;whales;first modern mammals 33,900.000 years ago
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amphibians spread; sharks and bony fish, winged insects 359,200,000 years ago
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earth becomes habitable; spontaneous generation of first cells; rise of bacteria and cyanobactyeria (blue-green algae) 4,000,000,000 years ago
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formation of earth (uninhabitable) 4,000,000,000 years ago
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first amphibians; freshwater fish; wingless insects 416,000,000 years ago
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land colonized by arthropods and plants 443,700,000 years ago
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trilobites abundant; vertebrates increase 488,300,000 years ago
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Peak of mammals; modern invertebrates 5,300,000 years ago
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first horses 55,800.000 years ago
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early mammals become dominant; rise of modern birds 65,500,000 years ago
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mass extinctions (including dinosaurs); flowering plants appear 145,500,000 years ago
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simple multicellular sea creatures develop; algae and plakton develop; eukaryotic cells develop 2,500,000,000 years ago
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first dinosaurs, rise of mammal-like reptiles 251,000,000 years ago
