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The precambrian took place 4 billion years ago when the earth first started to form to the beginning of the combrian period 541 mil. years ago.
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4 billion years to 4000 million years
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This eon started 4000 million years ago and ended 2500 million years ago. The earth's crust cooled down enough to allow continents to start to form
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Known as the "Hell eon" was an eon when the earth was cooling down, this eon started 4 billion years ago and ended 4000 million years ago.
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