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physical phenomena > event > era > geological era

geological era
subject			fact

geological era	is a kind of era
era	has start time
	has duration
event	has synonym world point
	has time of occurrence

Kinds of geological era :

• cenozoic era (9 kinds, 24 facts)
• mesozoic era (3 kinds, 12 facts)
• paleozoic era (7 kinds, 24 facts)
• precambrian era (3 kinds, 12 facts)