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| This page lists events in the '''early prehistory''' of the ] and the ], up to approximately 10,000 BC. Note that many of these dates are speculative or very rough estimates. For events from 10,000 BC onwards, see ]. For greater detail see the articles on the various geological periods. | |||
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| Of course, this scientific speculation and theory, not absolute fact. Another history of the world is found in the ]. | |||
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| * 13.7 ± 0.2 ] years ago: beginning of the universe (the ]) | |||
| * 13.2 billion years ago: existence of the first known star-forming ] | |||
| * 4.6 billion years ago: the ] begins to form | |||
| * 4.5 billion years ago: formation of the Earth (see ]) | |||
| * 3.9 to 4.1 billion years ago: ] (]) | |||
| * 2.3 billion years ago: first known ] ice age | |||
| * 1.8 to 2.1 billion years ago: appearance of the earliest ]s | |||
| * 750 million years ago: beginning of a possible ] ice age | |||
| * 600 million years ago: ] | |||
| * 580 million years ago: end of possible ] ice age | |||
| * 575 million years ago: origin of the oldest ] fossils | |||
| * 540 million years ago: end of the ] period and beginning of the ]. Time of the ] and appearance of the first ]s. | |||
| * 500 million years ago: ] period begins | |||
| * 435 million years ago: ] period begins | |||
| * 420 million years ago: first creatures with ] | |||
| * 400 million years ago: ] begins | |||
| * 340 million years ago: ] period begins | |||
| * 280 million years ago: ] period begins | |||
| * 251.4 million years ago: the ]; ] era ends. Beginning of the ] period, the ] and of the age of the dinosaurs. | |||
| * 195 million years ago: ] period begins; appearance of the earliest ]s | |||
| * 135 million years ago: ] period begins | |||
| * 65 million years ago: ] at the end of the ] period (end of the ] era); start of the ] period (] era). End of the age of the ]. | |||
| * 60 million years ago: the first ] begin to evolve | |||
| * 49 million years ago: ]s return to the water | |||
| * 40 million years ago: age of the ] parvorder; first ] evolve | |||
| * 36 million years ago: end of ], start of ] epoch | |||
| * 34 million years ago: ]s begin to evolve | |||
| * 26 million years ago: emergence of the first true ] | |||
| * 24 million years ago: ] epoch begins | |||
| * 20 million years ago: first forms of ] appear | |||
| * 18-12 million years ago: emergence of the '']'' family | |||
| * 5-7 million years ago: '']/]'' split | |||
| * 5.5 million years ago: appearance of the genus '']'' | |||
| * 5 million years ago: ] epoch begins | |||
| * 4.5 million years ago: appearance of the genus '']'' | |||
| * 4 million years ago: start of last ] | |||
| * 2.5 million years ago: emergence of the ] | |||
| * 1.5 million years ago: ] epoch (] period) begins | |||
| * 790,000 years ago: earliest evidence of the controlled use of ] by '']'' | |||
| * 700,000 years ago: last reversal of the ] | |||
| * 500,000 years ago: ] by '']'' | |||
| * 300,000 years ago: '']'' separated from '']'' (]) | |||
| * 250,000 years ago: appearance of '']'' | |||
| * 200,000 years ago: appearance of '']'' | |||
| * 160,000 years ago: split between '']'' and '']'' | |||
| * 150,000 years ago: time of ] | |||
| * 125,000 years ago: peak of the ] interglacial period | |||
| * 100,000 years ago: earliest estimate for the domestication of ]s | |||
| * 90,000 years ago: time of ] | |||
| * 75,000 years ago: ancestors of the ] reached Australia | |||
| * 60,000 years ago: ] migration | |||
| * 40,000 years ago: ] colonisation of ] (]) | |||
| * 29,000 years ago (27,000 BC): extinction of '']''. | |||
| * 23,000 BC: first ] | |||
| * 19,000 BC: ] | |||
| * 18,000 BC: the oldest known ] (the ]) | |||
| * 10,000 BC: ] leaves ] and southern ]; start of the ] epoch and ] | |||
| ] | |||
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