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physical phenomena > event > era > geological era > paleozoic era

paleozoic era
subject			fact

paleozoic era	has duration 370 million years
	has start time 600 million years ago
	is a kind of geological era
event	has synonym world point
	has time of occurrence

Kinds of paleozoic era :

• cambrian period (3 facts)
• devonian period (3 facts)
• mississippian period (3 facts)
• ordovician period (3 facts)
• pennsylvanian period (3 facts)
• permian period (3 facts)
• silurian period (3 facts)