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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Proterozoic
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INFOTEXT
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1992-09-02
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Period of geological time, 2.5 billion to 590
million years ago, the second division of the
Precambrian era. It is defined as the time of
simple life, since many rocks dating from
this eon show traces of biological activity,
and some contain the fossils of bacteria and
algae.