YearEvent
c. 4 billion years ago

Go to structure of the Earth in Visual English Dictionary (1 ed.)

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c. 3.5 billion years ago

Go to bacteria in World Encyclopedia (1 ed.)

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c. 3 billion years ago

Go to endosymbiont theory in A Dictionary of Biology (6 ed.)

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1 billion years ago

Go to Ediacaran fossils in A Dictionary of Earth Sciences (3 ed.)

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c. 500 million years ago

Go to Ordovician in A Dictionary of Earth Sciences (3 ed.)

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c. 400 million years ago

Go to Psilophytales in A Dictionary of Plant Sciences (2 ed.)

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c. 350 million years ago

Go to insects in The Oxford Companion to the Earth (1 ed.)

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c. 340 million years ago

Go to Amphibia in A Dictionary of Biology (6 ed.)

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c. 300 million years ago

Go to Reptilia in A Dictionary of Biology (6 ed.)

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c. 250 million years ago

Go to Pangaea in A Dictionary of Zoology (3 ed.)

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c. 225 million years ago

Go to dinosaur in World Encyclopedia (1 ed.)

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c. 170 million years ago

Go to mammal in World Encyclopedia (1 ed.)

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c. 150 million years ago

Go to Archaeopteryx in A Dictionary of Genetics (7 ed.)

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c. 125 million years ago

Go to Archaeopteryx in A Dictionary of Genetics (7 ed.)

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c. 65 million years ago

Go to dinosaur in World Encyclopedia (1 ed.)

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Go to mammal in World Encyclopedia (1 ed.)

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c. 45 million years ago

Go to Primates in A Dictionary of Biology (6 ed.)

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c. 15 million years ago

Go to Simiiformes in A Dictionary of Zoology (3 ed.)

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c. 6 million years ago

Go to Paranthropus in A Dictionary of Zoology (3 ed.)

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c. 4.5 million years ago

Go to hominid in A Dictionary of Biology (6 ed.)

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c. 4.4 million years ago

Go to Ardi in New Oxford American Dictionary (3 ed.)

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c. 3.6 million years old

Go to Australopithecus in The Concise Oxford Dictionary of Archaeology (2 ed.)

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c. 3.2 million years ago

Go to Australopithecine in A Dictionary of Genetics (7 ed.)

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c. 2.6 million to 14,000 years ago

Go to Palaeolithic in The Oxford Dictionary of Phrase and Fable (2 ed.)

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c. 2.6 to 1.2 million years ago

Go to Neanderthal man in A Dictionary of Biology (6 ed.)

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c. 2.5 million years ago

Go to hominid in A Dictionary of Biology (6 ed.)

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c. 2.2 million years ago

Go to Homo in A Dictionary of Genetics (7 ed.)

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c. 2.2 to 1.4 million years ago

Go to Homo habilis in World Encyclopedia (1 ed.)

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c. 1.85 million years ago

Go to Homo habilis in World Encyclopedia (1 ed.)

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c. 1.8 million years ago

Go to Homo erectus in World Encyclopedia (1 ed.)

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c. 1.7 million years ago

Go to Homo erectus in The Concise Oxford Dictionary of Archaeology (2 ed.)

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1.6 million years ago

Go to Homo erectus in The Concise Oxford Dictionary of Archaeology (2 ed.)

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Go to Speech in Magic Universe: A Grand Tour of Modern Science (1 ed.)

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c. 1 million years ago

Go to Speech in Magic Universe: A Grand Tour of Modern Science (1 ed.)

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c. 800,000 years ago

Go to Homo in A Dictionary of Biology (6 ed.)

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c. 230,000 years ago

Go to Homo sapiens in The Concise Oxford Dictionary of Archaeology (2 ed.)

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c. 150,000 years ago

Go to Homo sapiens in The Concise Oxford Dictionary of Archaeology (2 ed.)

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c. 130,000 years ago

Go to Neanderthal man in A Dictionary of Biology (6 ed.)

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c. 120,000 to 35,000 years ago

Go to Neanderthal man in A Dictionary of Biology (6 ed.)

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c. 50,000 to 30,000 years ago

Go to Neanderthal man in A Dictionary of Biology (6 ed.)

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c. 35,000 years ago

Go to Neanderthal man in A Dictionary of Biology (6 ed.)

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