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physical phenomena > event > era > geological era
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geological era
subjectfact 
geological erais a kind of era2001-09-27 09:29:59.0
erahas start time2001-09-27 09:29:57.0
has duration2001-09-27 09:29:57.0
eventhas synonym world point2001-09-27 09:29:57.0
has time of occurrence2001-09-27 09:29:57.0

Kinds of geological era :