Geological Time

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by PauNav
Last updated 8 years ago

Earth History

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Geological Time

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Eon =PhanerozoicEra =Cenozoic Period =Paleogene Epoch =Oligocene Age =Chattain

Geological Time

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How old is the universe? How old is our sun? How old is the earth? When did life first appear on the earth? How long have Homo sapiens inhabited the earth?

The geologic history of the Earth is broken up into hierarchical chunks of time. From largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

The first geologic time scale was proposed in 1913 by the British geologist Arthur Holmes (1890 - 1965). This was soon after the discovery of radioactivity, and using it, Holmes estimated that the Earth was about 4 billion years old - this was much greater than previously believed.

The Earth as been evolving and changing for many hundreds of millions of years, even billions of years!!!!!!




Earth history spans approximately 4.5 billion years. This history has been divided by geologists into smaller periods: eons, eras, and epochs based on climatic events and the presence of various forms of life.


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