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physical phenomena > event > era > geological era > paleozoic era > ordovician period
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ordovician period
subjectfact 
ordovician periodhas duration 75 million years2001-09-27 09:30:00.0
has start time 500 million years ago2001-09-27 09:30:00.0
is a kind of paleozoic era2001-09-27 09:30:00.0
eventhas synonym world point2001-09-27 09:29:57.0
has time of occurrence2001-09-27 09:29:57.0