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How do we tell the difference between geologic ages? - Livescience.com

How do we tell the difference between geologic ages? - Livescience.com

From the emergence of life to mass extinctions, Earth has gone through incredible changes in its 4.6 billion years. With so much history, how can researchers keep track of what happened when? 

The system many scientists have settled on is the International Geologic Time Scale (laid out here in the International Chronostratigraphic Chart), which breaks geologic time into five units. From the longest to the shortest and most precise, those units are eons, eras, epochs, periods and ages. 

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