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physical phenomena > event > era > geological era > cenozoic era

cenozoic era
subject			fact

cenozoic era	has duration 63 million years
	has start time 63 million years ago
	is a kind of geological era
event	has synonym world point
	has time of occurrence

Kinds of cenozoic era :

• quaternary period (2 kinds, 5 facts)
• tertiary period (5 kinds, 16 facts)