Science Fact Finder | The Earth - What Are The Major Eras, Periods, And Epochs In Geologic Time?

What are the major eras, periods, and epochs in geologic time?

Using modern dating techniques, scientists have constructed the following categorization of the various geologic time periods:

...

Era	Period	Epoch	(Est. millions of years)
Cenozoic	Quaternary	Holocene	10,000 years ago
		Pleistocene	1.9
	Tertiary	Pliocene	6
		Miocene	25
		Oligocene	38
		Eocene	55
		Paleocene	65
Mesozoic	Cretaceous

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