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physical phenomena > event > era > geological era > cenozoic era > quaternary period

quaternary period
subject			fact

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

Kinds of quaternary period :

• pleistocene epoch (3 facts)
• recent quaternary epoch