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More than 10 billion years since the universe exploded into existence from nothing.
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The earth slowly started forming.
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Singled- celled bacteria are the oldest living organisms.
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Microbes thrive in an oxygen free enviroment.
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The fossils usually appear offshore.
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Oxygen appears in the envoronment, causing damage to living tissues.
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The first of four global ice ages sets in.
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The oldest definition fossils date back to 1,800 mya.
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Life on earth has been restricted to the oceans.
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It is the southern hemisperes landmass.
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Oxygen nears 21% by volume of the atomosphere.
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Carbon sinks forming "coal forests".
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90% of marine invertebrate genera go extinct.
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Most of these things go extinct.
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Pangaea starts to break apart.
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About 60-80 precent of all species go extinct.
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Primates evolved million years earlier.
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Features appearent early whale fossils.
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In the late pieistocene humans began to disperce throughout Africa.
